Forward Collision Avoidance. Review the 6 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
Service Brakes, Air. Review the 3 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
Service Brakes. Review the 2 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

3 crash reports0 fire reports4 injury reports

Unknown Or Other complaints

3 reports

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Mileage unknown · Dec 17, 2024

Unknown Or Other

Illegal communication device on and inside truck harss and stalk driver across state lines divert driver attention while driving

NHTSA ODI #11631164

Mileage unknown · Feb 11, 2022

Forward Collision AvoidanceLane DepartureUnknown Or Other

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The system isn't working properly. The AEB(automatic emergency braking) has been braking when I was driving on ice for no reason almost making cars get skids. It's essential to not brake hard on a slippery road. But that system put me in dangerous conditions. Not only one time but several. I was afraid to drive with them on. Also, I tried to see how the truck goes without it, I unplugged it and the truck was braking properly and never had skidded on slippery roads. And funny thing my acceleration was better, and fuel consumption mile/gallons increased from 5.6 to 6.7. I know manufacturers are forced to install AEB, but I don't want to die from it. I don't need AEB and want you like the government to protect my life and right to disable legally AEB and lane changing system from the truck. I want to take responsibility 100% for any accidents front end collisions or losing control of a vehicle. I am a rally driver, I know how to handle equipment in severe conditions, I know physics and know-how to go off-road, drift. I don't want some system like AEB to held me liable if there would be an accident caused by it. I want you, as protector of our rights of life, liberty and pursuit of happiness to allow drivers to choose by the will to legally disable the AEB system taking responsibility. I take care of road safety and even want to buy one day a Cab Over Engine semi-truck because I am watching the road all the time. I hold a safe following distance and never did a hard brake in 3 years of driving to avoid a collision. I want an AEB system only when it gonna surpass my professional approach to safe driving. It needs more development and calibration, and cameras surrounding systems to do it better. As for now, I don't want to risk my life being an experiment in the eyes of big manufacturing companies.

NHTSA ODI #11451612

Mileage unknown · Dec 31, 2021

Forward Collision AvoidanceUnknown Or Other

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FYI, this is the second 2022 Cascadia I’ve driven with this issue. The forward radar sensor detects a target 3 feet in front of me and slams on the brakes if the cruise control is set. I can over ride it by turning off the CC, but then I get constant alarms for following too closely and collision alerts. The issue has generated 4 critical events to my company. This happens randomly, with no warning whether I am in traffic or not. I believe this to be a significant safety issue at worst, and a very unpleasant driving environment at best. According to my company, this is not the only two tractors in which this occurs. My previous tractor was looked at by a Freightliner dealer who failed to repair the issue.

NHTSA ODI #11445705

Official recalls

26V583000 · Electronic Stability Control (esc); Service Brakes, Air:antilock

Sep 9, 2026

Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2023 Freightliner Cascadia and 2022 Western Star 49X vehicles previously repaired incorrectly under recall numbers 23V073 or 22V817. The brake modulator valves on the front axle may corrode and cause the vehicle to pull to one side during braking initiated by Electronic Stability Control (ESC) or Roll Stability Control (RSC).

Consequence & remedy

Consequence: Brakes that pull to one side may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will replace the brake modulator valves, free of charge. Owner notification letters are expected to be mailed November 8, 2026. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is F1039. Vehicles repaired under the prior recalls will need the new repair completed.

Additional source detail variants (2)

Electronic Stability Control (esc)

Consequence: Brakes that pull to one side may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will replace the brake modulator valves, free of charge. Owner notification letters are expected to be mailed November 8, 2026. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is F1039. Vehicles repaired under the prior recalls will need the new repair completed.

Service Brakes, Air:antilock

Consequence: Brakes that pull to one side may cause a sudden change in vehicle direction, increasing the risk of a crash.

23V299000 · Electronic Stability Control (esc)

Apr 26, 2023

Daimler Trucks North America, LLC (DTNA) is recalling certain short wheelbase 2020-2024 Freightliner Cascadia, 2021-2024 Freightliner M2 Business Class, 2022 Western Star 4700, and 2020 Freightliner Classic Cascadia vehicles. The vehicle is equipped with an electronic stability control system and tire combination that may understeer during a J-turn. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 136, "Electronic Stability Control Systems on Heavy Vehicles."

Consequence & remedy

Consequence: Understeering during a J-turn may increase the risk of a crash.

Remedy: DTNA will replace the tires, free of charge. Owner notification letters were mailed June 19, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL971.

23V073000 · Electronic Stability Control (esc); Service Brakes, Air:antilock:modulator

Feb 10, 2023

Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2023 Freightliner Cascadia, 2020-2023 Western Star 49X, 2021-2023 Western Star 47X, and 2022 Freightliner 114SD vehicles. The brake modulator valves on the front axle may corrode and cause the vehicle to pull to the affected side during braking initiated by Electronic Stability Control (ESC) or Roll Stability Control (RSC).

Consequence & remedy

Consequence: Brakes that pull to one side may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 13, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL966.

Additional source detail variants (2)

Electronic Stability Control (esc)

Consequence: Brakes that pull to one side may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 13, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL966.

Service Brakes, Air:antilock:modulator

Consequence: Brakes that pull to one side may cause a sudden change in vehicle direction, increasing the risk of a crash.

22V817000 · Forward Collision Avoidance: Adaptive Cruise Control; Service Brakes, Air:antilock:modulator

Nov 1, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2023 Freightliner Cascadia, 2020-2022 Freightliner Business Class M2, and 2022 Freightliner 114SD, and 2020-2023 Western Star 49X, 2021-2023 Western Star 47X, and 2021-2022 Western Star 57X vehicles. The brake modulator valves on the front axle may corrode and cause the vehicle to pull to the affected side during an Adaptive Cruise Control (ACC) braking event.

Consequence & remedy

Consequence: Brakes that pull to one side during an ACC braking event may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 16, 2023. DTNA's number for this recall is FL-958. This recall expands and replaces previous recall 20V-390. All vehicles previously repaired under recall 20V-390 will need to have the new remedy performed.

Additional source detail variants (2)

Service Brakes, Air:antilock:modulator

Consequence: Brakes that pull to one side during an ACC braking event may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 16, 2023. DTNA's number for this recall is FL-958. This recall expands and replaces previous recall 20V-390. All vehicles previously repaired under recall 20V-390 will need to have the new remedy performed.

Forward Collision Avoidance: Adaptive Cruise Control

Consequence: Brakes that pull to one side during an ACC braking event may cause a sudden change in vehicle direction, increasing the risk of a crash.

Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 16, 2023. DTNA's number for this recall is FL-958. This recall expands and replaces previous recall 20V-390. All vehicles previously repaired under recall 20V-390 will need to have the new remedy performed.

22V468000 · Parking Brake

Jun 30, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. The electronic parking brake may not engage when the vehicle is keyed off, which may result in a vehicle rollaway. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard numbers 121, "Air Brake Systems," and 136, "Electronic Stability Control Systems on Heavy Vehicles."

Consequence & remedy

Consequence: A vehicle rollaway increases the risk of a crash.

Remedy: Dealers will install a fused harness overlay, free of charge. Owner notification letters were mailed March 9, 2023. Owners may contact DNTA customer service at 1-800-547-0712. DTNA's number for this recall is FL-945.

22V456000 · Service Brakes, Air:antilock:abs Warning Light; Service Brakes, Air:antilock:control Unit/module

Jun 24, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. The Anti-lock Brake System (ABS) fault codes will not be stored when the vehicle is keyed off for more than 5 seconds, impairing its diagnostic features and warning light. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."

Consequence & remedy

Consequence: An ABS system that does not store fault codes may fail to warn the driver of an issue, or prevent proper repair. Either of these scenarios can increase the risk of a crash.

Remedy: DTNA will repurchase the vehicles. Owner notification letters were mailed June 28, 2024. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL943.

Additional source detail variants (2)

Service Brakes, Air:antilock:abs Warning Light

Consequence: An ABS system that does not store fault codes may fail to warn the driver of an issue, or prevent proper repair. Either of these scenarios can increase the risk of a crash.

Remedy: DTNA will repurchase the vehicles. Owner notification letters were mailed June 28, 2024. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL943.

Service Brakes, Air:antilock:control Unit/module

Consequence: An ABS system that does not store fault codes may fail to warn the driver of an issue, or prevent proper repair. Either of these scenarios can increase the risk of a crash.

Remedy: DTNA will repurchase the vehicles. Owner notification letters were mailed June 28, 2024. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL943.

22V443000 · Service Brakes

Jun 22, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. The emergency braking system may not engage, resulting in the loss of braking ability.

Consequence & remedy

Consequence: A loss of braking ability can increase the risk of a crash.

Remedy: Dealers will install a double check valve, free of charge. Owner notification letters were mailed December 22, 2022. Owners may contact DNTA customer service at 1-800-547-0712. DTNA's number for this recall is FL-941.

22V405000 · Steering

Jun 8, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022-2023 Freightliner (FCCC) MT45, MT45G and 2022-2023 Freightliner Cascadia vehicles. The steering gears may have been incorrectly assembled, which can cause the gear to fracture.

Consequence & remedy

Consequence: A fractured steering gear can cause a loss of steering control, increasing the risk of a crash.

Remedy: Dealers will inspect and replace the steering gears, as necessary, free of charge. Owner notification letters were mailed December 28,2022. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL-938.

22V374000 · Service Brakes, Air:supply:check Valve

May 25, 2022

Daimler Trucks North America LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. The double check valve may trap air which can impair service brake function and lock the rear axle while the vehicle is in motion. A locked rear axle may cause brake components to fail or increased stopping distance.

Consequence & remedy

Consequence: Brake component failure and increased stopping distance may increase the risk of a crash.

Remedy: All vehicles have been remedied, therefore no owner notification letters are necessary. Owners may contact DTNA customer service at 1-800-547-2712. DTNA's number for this recall is FL-936.

22V339000 · Electronic Stability Control (esc); Service Brakes, Air:antilock

May 16, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. The antilock brakes (ABS) and electronic stability control (ESC) may be manually disabled. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard numbers 121, "Air Brake Systems," and 136, "Electronic Stability Control Systems on Heavy Vehicles."

Consequence & remedy

Consequence: Disabled ABS and ESC may lead to loss of braking or stability control, which can increase the risk of a crash.

Additional source detail variants (2)

Electronic Stability Control (esc)

Consequence: Disabled ABS and ESC may lead to loss of braking or stability control, which can increase the risk of a crash.

Remedy: DTNA will repurchase the vehicles. Owner notification letters were mailed June 28, 2024. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL932.

Service Brakes, Air:antilock

Consequence: Disabled ABS and ESC may lead to loss of braking or stability control, which can increase the risk of a crash.

Remedy: DTNA will repurchase the vehicles. Owner notification letters were mailed June 28, 2024. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL932.

22V101000 · Electrical System:software; Service Brakes

Feb 22, 2022

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. A certain combination of software and anti-lock brake system (ABS) hardware may lead to a system error, possibly causing a loss of vehicle braking and the inability to set the parking brake.

Consequence & remedy

Consequence: A loss of brakes increases the risk of a crash.

Remedy: DTNA service facilities will update the software, free of charge. Owner notification letters were mailed on March 10, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL919.

Additional source detail variants (2)

Service Brakes

Consequence: A loss of brakes increases the risk of a crash.

Remedy: DTNA service facilities will update the software, free of charge. Owner notification letters were mailed on March 10, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL919.

Electrical System:software

Consequence: A loss of brakes increases the risk of a crash.

21V965000 · Fuel System, Diesel:fuel Injection System:fuel Rail

Dec 13, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2022 Western Star 4700, 2019-2022 Freightliner 114SD, 2021-2022 Western Star 49X, Freightliner Cascadia P4, 2022 Western Star 47X, 2021 Western Star WF110, 2020 Western Star WJ121, and 2019-2021 FCCC XCP Chassis vehicles. The fuel tubes between the fuel rail and the injectors for cylinders four, five, and six may fatigue and crack, which can result in a high pressure fuel leak.

Consequence & remedy

Consequence: A high pressure fuel leak in the presence of an ignition source can increase the risk of a fire.

Remedy: Dealers will replace the fuel tubes, and install vibration isolators, free of charge. Owner notification letters were mailed January 28, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-915.

21V715000 · Engine And Engine Cooling:exhaust System

Sep 15, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Freightliner Cascadia vehicles. The exhaust pipe outlet may have been improperly installed with the tip facing towards the battery box mounted directly above the frame rail.

Consequence & remedy

Consequence: The exhaust heat may melt the battery box, increasing the risk of a fire.

Remedy: Dealers will inspect and rotate exhaust pipe tip as required. Owner notification letters were mailed on November 14, 2021. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL-901.

21V481000 · Electrical SYSTEM:12V/24V/48V Battery:cables

Jun 25, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2019-2022 Freightliner Cascadia P4, 2021 Western Star WH126, 2020 Western Star WJ121, and 2021-2022 Western Star 49X vehicles. The battery cable terminal may break, resulting in a loss of electrical power and unintended engine stall.

Consequence & remedy

Consequence: An engine stall increases the risk of a crash.

Remedy: Dealers will repair or replace the battery cables, free of charge. Owner notification letters were mailed on January 7, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-893.

21V369000 · Steering:linkages:tie Rod Assembly

May 19, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2021-2022 Freightliner 114SD, 122SD, Business Class M2, Cascadia, 108SD, Western Star 4900, 4700, 5700, Custom Chass RV Chassis, Custom Chass S2 Chassis, Custom Chass XC Chassis, Custom Chass XB Chassis, and Custom Chass MT Chassis. The tie rod clamps may be loose, which could result in loose tie rod ends that could break or detach.

Consequence & remedy

Consequence: Detached or broken tie rod ends can result in steering loss, increasing the risk of a crash.

Remedy: Dealers will replace the tie rod clamp bolts and nuts, free of charge. Owner notification letters were mailed December 23, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-888.

21V357000 · Exterior Lighting:headlights:bulbs

May 14, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2022 Freightliner Cascadia vehicles equipped with halogen headlight assemblies. The halogen headlight bulb may dislodge during replacement and contact other vehicle components, possibly causing them to melt.

Consequence & remedy

Consequence: Melting components can increase the risk of fire.

Remedy: Dealers will install a foam grommet, cut a 4-inch access hole into the inner fender, and add a warning label on both fenders, free of charge. Owner notification letters were mailed on July 9, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-887.

21V256000 · Steering:critical Fasteners; Steering:linkages:tie Rod Assembly

Apr 12, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2021-2022 Freightliner Cascadia, Business Class M2, 114SD, 108SD, 122SD, Custom Chass S2 Chassis, Custom Chass XB Chassis, Custom Chass XC Chassis, and Custom Chass MT Chassis Western Star 4700, 4900, 5700 vehicles. The steering arm and tie rod bolts may have a defective seam that can fracture.

Consequence & remedy

Consequence: A fractured bolt may cause a loss of steering, increasing the risk of a crash.

Remedy: DTNA will notify owners, and dealers will replace the tie rod arm and steering arm bolts, free of charge. The recall began on June 10, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-884.

Additional source detail variants (2)

Steering:linkages:tie Rod Assembly

Consequence: A fractured bolt may cause a loss of steering, increasing the risk of a crash.

Remedy: DTNA will notify owners, and dealers will replace the tie rod arm and steering arm bolts, free of charge. The recall began on June 10, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-884.

Steering:critical Fasteners

Consequence: A fractured bolt may cause a loss of steering, increasing the risk of a crash.

21V073000 · Engine

Feb 12, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2021-2022 Freightliner Cascadia vehicles equipped with a Cummins X15 engine. The capscrews that attach the flywheel to the crankshaft may have been improperly torqued, allowing the flywheel to detach.

Consequence & remedy

Consequence: A detached flywheel can cause loss of drive power, increasing the risk of a crash. Additionally, driveline pieces may be ejected from the engine compartment, increasing the risk of injury.

Remedy: DTNA will work with the engine manufacturer Cummins Inc. to notify owners, and Cummins dealers will properly torque the capscrews and inspect for possible damage and, if necessary, repair any damage found, free of charge. The recall is expected to begin April 12, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-875.

21V007000 · Tires; Tires:tread/belt

Jan 13, 2021

Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2022 Freightliner Cascadia sleeper trucks equipped with Bridgestone R284, R268, or R283S ECOPIA steer axle tires in conjunction with a specific air dam. The steer tires may experience tread separation or blow-outs while driving.

Consequence & remedy

Consequence: Tread separation and/or blow-outs while driving may result in a loss of vehicle control, increasing the risk of a crash.

Remedy: DTNA will notify owners, and dealers will replace the steer tires, free of charge. The recall began March 10, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL872.

Additional source detail variants (2)

Tires:tread/belt

Consequence: Tread separation and/or blow-outs while driving may result in a loss of vehicle control, increasing the risk of a crash.

Remedy: DTNA will notify owners, and dealers will replace the steer tires, free of charge. The recall began March 10, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL872.

Tires

Consequence: Tread separation and/or blow-outs while driving may result in a loss of vehicle control, increasing the risk of a crash.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

EA25006 · Automatic Emergency Braking Errors

Opened Oct 23, 2025 · No close date supplied

Status: open (inferred from source dates) · Forward Collision Avoidance: Dynamic Brake Support/brake Assist

On May 26, 2023, the Office of Defects Investigation (ODI) opened a Preliminary Evaluation (PE23010) to assess reports of false positive activation of the Automatic Emergency Braking (AEB) system in model year (MY) 2017-2022 Daimler Trucks North America (DTNA) vehicles. The reports alleged that activation of the AEB system occurred while driving with no apparent obstruction in the vehicle's forward path, resulting in sudden vehicle deceleration. DTNA indicated that it received of a total of 315 reports that may relate to the alleged defect in MY 2017-2022 DTNA vehicles. DTNA stated that the vast majority of false positive activation of the subject systems occur in very limited durations and result in a five mile per hour deceleration. ODI considered four AEB systems offered by DTNA: Detroit Assurance 2.0, Detroit Assurance 4.0, Detroit Assurance 5.0, and Wabco OnGuard. ODI’s analysis shows that of the Detroit Assurance versions, all are failing at similar rates. The OnGuard AEB systems equipped on the same model and model year vehicles have experienced a significantly lower claim rate. To date, ODI has received a total of 32 consumer complaints of inadvertent activation of AEB in MY 2017-2022 DTNA vehicles. In total, ODI reviewed 347 unique (i.e., non-duplicative Vehicle Identification Numbers) reports that may relate to the alleged defect, which include 24 reports involving a crash, 13 reports involving an alleged injury and one report with a fatality. PE23010 has been upgraded to an Engineering Analysis to further assess the scope, frequency, and potential safety related consequences of the inadvertent AEB activations in MY 2017-2022 DTNA vehicles. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

PE23010 · Automatic Emergency Braking Errors

Opened May 26, 2023 · Closed Oct 23, 2025

Status: closed (inferred from source dates) · Forward Collision Avoidance: Dynamic Brake Support/brake Assist

On May 26, 2023, the Office of Defects Investigation (ODI) opened a Preliminary Evaluation (PE23010) to assess reports of false positive activation of the Automatic Emergency Braking (AEB) system in model year (MY) 2017-2022 Daimler Trucks North America (DTNA) vehicles. The reports alleged that activation of the AEB system occurred while driving with no apparent obstruction in the vehicle's forward path, resulting in unexpected and sudden vehicle deceleration. ODI sent an information request letter to DTNA on June 15, 2023.In its September 1, 2023, response, DTNA indicated that it received of a total of 315 reports that may relate to the alleged defect in MY 2017-2022 DTNA vehicles. DTNA stated that the vast majority of false positive activation of the subject systems occur for very limited durations and result in a five mile per hour deceleration. ODI considered four AEB systems offered by DTNA: Detroit Assurance 2.0, Detroit Assurance 4.0, Detroit Assurance 5.0, and Wabco OnGuard. ODI’s analysis shows that of the Detroit Assurance versions, all fail at similar rates. The Wabco OnGuard AEB systems equipped on the same model and model year vehicles have experienced a significantly lower claim rate. To date, ODI has received a total of 32 consumer complaints of inadvertent activation of AEB in MY 2017-2022 DTNA vehicles. In total, ODI reviewed 347 unique (i.e., non-duplicative Vehicle Identification Number) reports that may relate to the alleged defect, which include 24 involving a crash, 13 reports involving an alleged injury and one report with a fatality. PE23010 has been upgraded to an Engineering Analysis (EA25006) to further assess the scope, frequency, and nature of the inadvertent AEB activations in MY 2017-2022 Freightliner Cascadia and Western Star 5700 vehicles.In particular, this EA will assess the safety consequences likely to arise in the scenarios during which the AEB inadvertently and unexpectedly activates, such as the speeds and conditions during which the activation occurs. To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to NHTSA.gov.