IllustrationTL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. WHENEVER THE CONTACT DEPRESSES THE BRAKE PEDAL WHILE DRIVING AT ANY SPEED, THE PEDAL PULSATES AND ACTS AS IF IT DOES NOT WANT TO GO DOWN PROPERLY. THE BRAKES MAKE A NOISE AND THE VEHICLE DOES NOT STOP PROPERLY. THE CURRENT MILEAGE WAS 7,000 AND FAILURE MILEAGE WAS 300.
2002 GMC Sierra 2500
Owner reports · Recalls · Investigations
More warning signs than most Sierra 2500 years
Owner complaints for the 2002 GMC Sierra 2500 are substantially higher than the model-year median of 46.
About this comparison →How this year compares
Owner complaints by model year
Compare all Sierra 2500 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
110–25K
1525–50K
2450–75K
1975–100K
30100–150K
15150K+
114 reports with mileage · 20 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Service Brakes, Hydraulic. Review the 44 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 32 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 14 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
10 crash reports1 fire reports5 injury reports
Service Brakes, Hydraulic complaints
44 reportsABS BRAKE SENSOR FAILURE. AT LOW SPEEDS THE ABS WORK EVEN WHEN WHEELS ARE NOT LOCKED UP. THE FIRST TIME I EXPERIENCED THIS WAS PULLING A 7000LB TRAILER. I HAD TO DIVERT THE TRUCK AND TRAILER ONTO THE SHOULDER TO AVOID PLOWING INTO TRAFFIC IN FRONT OF ME. THIS APPEARS TO BE A VERY EXPENSIVE REPAIR TO MAKE, REPLACING THE FRONT WHE…
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ABS BRAKE SENSOR FAILURE. AT LOW SPEEDS THE ABS WORK EVEN WHEN WHEELS ARE NOT LOCKED UP. THE FIRST TIME I EXPERIENCED THIS WAS PULLING A 7000LB TRAILER. I HAD TO DIVERT THE TRUCK AND TRAILER ONTO THE SHOULDER TO AVOID PLOWING INTO TRAFFIC IN FRONT OF ME. THIS APPEARS TO BE A VERY EXPENSIVE REPAIR TO MAKE, REPLACING THE FRONT WHEEL HUB ASSEMBLIES. CURRENTLY WE HAVE HAD TO DISCONNECT ONE OF THE ABS SENSORS TO KEEP THE ABS FROM ACTIVATING. *JB
TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. THE CONTACT FELT THE VEHICLE'S BRAKES PULSATE. HE TOOK THE VEHICLE TO THE DEALER WHO DISCOVERED THAT THE ROTORS WERE CORRODED, THE FRONT WHEEL HUBS WERE FILLED WITH WATER, THE ABS SENSORS WERE CORRODED, AND THE ENTIRE BRAKING SYSTEM NEEDED TO BE REPLACED. THE CURRENT AND FAILURE …
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TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. THE CONTACT FELT THE VEHICLE'S BRAKES PULSATE. HE TOOK THE VEHICLE TO THE DEALER WHO DISCOVERED THAT THE ROTORS WERE CORRODED, THE FRONT WHEEL HUBS WERE FILLED WITH WATER, THE ABS SENSORS WERE CORRODED, AND THE ENTIRE BRAKING SYSTEM NEEDED TO BE REPLACED. THE CURRENT AND FAILURE MILEAGES WERE 34,000.
TL* - THE CONTACT CALLED ABOUT 2002 GMC SIERRA 2500 HD. HE STATED THAT WHILE APPLYING BRAKES, 7 OUT OF 10 TIMES THE ABS SYSTEM ACTIVATE\D AND PUMPED THE BRAKES. THIS HAPPENED AT ANY TIME OF THE DAY, AND IN ALL WEATHER CONDITIONS. THE CONTACT STATED THAT THIS HAPPENED WHEN APPLYING BRAKES AT ANY SPEED. THE BRAKES PUSHED BAC…
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TL* - THE CONTACT CALLED ABOUT 2002 GMC SIERRA 2500 HD. HE STATED THAT WHILE APPLYING BRAKES, 7 OUT OF 10 TIMES THE ABS SYSTEM ACTIVATE\D AND PUMPED THE BRAKES. THIS HAPPENED AT ANY TIME OF THE DAY, AND IN ALL WEATHER CONDITIONS. THE CONTACT STATED THAT THIS HAPPENED WHEN APPLYING BRAKES AT ANY SPEED. THE BRAKES PUSHED BACK AND THERE WAS A THUMPING NOISE COMING FROM THE MASTER CYLINDER. THE CONTACT LOOKED UP INFORMATION FROM THE NHTSA WEBSITE AND FOUND THAT A RECALL 05V379000 HAD BEEN ISSUED FOR THIS VEHICLE. THE CONTACT SAID THAT HE TOOK VEHICLE TO THE DEALERSHIP, AND WAS TOLD THAT THIS VEHICLE DID NOT FALL UNDER THE RECALL DUE TO VIN. *AK THE INNER TIE ROD HAD EXCESSIVE PLAY, THE FRONT DIFFERENTIAL SEAL WAS LEAKING FROM THE VENT CAP, THE DAYTIME RUNNING LIGHT BULB WAS INOPERATIVE. THE CONSUMER DENIED TO HAVE REPAIRS MADE. UPDATED 01/29/07. *JB
UPON BRAKING UP TO A STOP SIGN FOR INSTANCE. THE VEHICLES ABS WILL KICK IN AT THE LAST MINUTE RELEASING THE LEFT FRONT WHEEL CAUSING THE VEHICLE TO DIVE TO THE RIGHT. THIS HAPPENS IN WET OR DRY CONDITION BUT IS PARTICULARLY BAD IN ICY CONDITIONS. *NM
DT*: THE CONTACT STATED WHILE TRAVELING 45 MPH UNDER NORMAL ROAD CONDITIONS, THE HYDRAULIC REAR BRAKE ROTORS RUSTED, AND STOPPING DISTANCE WAS INCREASED. THERE WERE NO WARNINGS PRIOR TO THE FAILURE. THE NATURE OF THE FAILURE WAS PERMANENT GRADUAL WORSENING. THE CONSUMER STATED THE REAR ROTORS HAD RUSTED SO BADLY THAT THEY FLA…
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DT*: THE CONTACT STATED WHILE TRAVELING 45 MPH UNDER NORMAL ROAD CONDITIONS, THE HYDRAULIC REAR BRAKE ROTORS RUSTED, AND STOPPING DISTANCE WAS INCREASED. THERE WERE NO WARNINGS PRIOR TO THE FAILURE. THE NATURE OF THE FAILURE WAS PERMANENT GRADUAL WORSENING. THE CONSUMER STATED THE REAR ROTORS HAD RUSTED SO BADLY THAT THEY FLAKED OFF IN PIECES. UPDATED 11/30/06. *JB
WHEN I PULLED INTO A LEFT TURN LANE AND TRIED TO APPLY THE BRAKES THE PEDAL WENT NEARLY TO THE FLOOR AND I HAD NO BRAKES LUCKILY THERE WERE NO OTHER CARS ON THE ROAD OR IN THE INTERSECTION AT THE TIME SO I WENT ON THROUGH AND THERE WAS NO ACCIDENT, I WAS CAMPING AT THE TIME AND I GOT THE TRUCK BACK TO THE CAMPGROUND WHEN I BAC…
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WHEN I PULLED INTO A LEFT TURN LANE AND TRIED TO APPLY THE BRAKES THE PEDAL WENT NEARLY TO THE FLOOR AND I HAD NO BRAKES LUCKILY THERE WERE NO OTHER CARS ON THE ROAD OR IN THE INTERSECTION AT THE TIME SO I WENT ON THROUGH AND THERE WAS NO ACCIDENT, I WAS CAMPING AT THE TIME AND I GOT THE TRUCK BACK TO THE CAMPGROUND WHEN I BACKED THE TRUCK INTO THE CAMPSITE AND APPLIED THE BRAKES THEY STARTED WORKING NORMALLY, I TOOK THE TRUCK TO THE DEALER AND THEY SAID THAT THEY COULD FIND NOTHING WRONG THEY EVEN SAID THAT THEY HAVE HAD SEVERAL OTHER VEHICLES DO THE SAME THING AND COULD NOT FIND ANYTHING WRONG WITH THEM AND THAT THIS PROBLEM WAS NORMAL FOR THE VEHICLE. *NM
DT*: THE CONTACT STATED THE VEHICLE STALLED ON THREE OCCASIONS. ALL INCIDENTS OCCURRED DURING ACCELERATION WHILE TRAVELING 25 TO 35 MPH. THERE WERE NO WARNINGS PRIOR TO THE INCIDENTS AND THE VEHICLE HAD NO PROBLEMS RESTARTING. THE DEALER COULD NOT DUPLICATE OR RESOLVE THE PROBLEM. *AK UPDATED 11/16/2006 - THERE WERE SUBSEQU…
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DT*: THE CONTACT STATED THE VEHICLE STALLED ON THREE OCCASIONS. ALL INCIDENTS OCCURRED DURING ACCELERATION WHILE TRAVELING 25 TO 35 MPH. THERE WERE NO WARNINGS PRIOR TO THE INCIDENTS AND THE VEHICLE HAD NO PROBLEMS RESTARTING. THE DEALER COULD NOT DUPLICATE OR RESOLVE THE PROBLEM. *AK UPDATED 11/16/2006 - THERE WERE SUBSEQUENT PROBLEM RESTARTING THE VEHICLE, AND AS MANY AS 3 TO 5 STALLING EPISODES PER WEEK. NOT ALL INCIDENTS OCCURRED WHILE TRAVELING. SOME INCIDENTS OCCURRED WHILE AT IDLE, AND AT A STOP. COMPLETE LOSS OF POWER STEERING AND BRAKES OCCURRED WHEN THE VEHICLE STALLED. THE DEALER DIAGNOSED THE PROBLEM AS A FAULTY CRANKSHAFT SENSOR AND REPLACED IT. RECENTLY THE CHECK ENGINE LIGHT HAS ILLUMINATED. THE DEALER DIAGNOSED THE PROBLEM AS A FAULTY TRANSMISSION SELECTOR POSITION SENSOR AND REPLACED IT. THE ABS ACTIVATED WHILE DRIVING ON DRY PAVEMENT. THE DEALER FOUND IT NECESSARY TO REPLACE BOTH FRONT ABS WHEEL SPEED SENSORS. *NM
ANTILOCK SYSTEM ACTIVATES ON MY 2002 GMC SERRIA AS STATED IN THE RECALL NHTSA CAMPAIGN NUMBER 05V379000. GMC SAYS MY VEHICLE BY VIN NUMBER IS NOT COVERED UNDER THIS RECALL. MY VIN # IS [XXX]. I'VE HAD A COUPLE OF NEAR ACCIDENTS BECAUSE OF THIS. I ALSO TOW A 36' FIFTH WHEEL CAMPER IN THE SUMMER TIME. *NM UPDATED 07/17/2012 *JS…
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ANTILOCK SYSTEM ACTIVATES ON MY 2002 GMC SERRIA AS STATED IN THE RECALL NHTSA CAMPAIGN NUMBER 05V379000. GMC SAYS MY VEHICLE BY VIN NUMBER IS NOT COVERED UNDER THIS RECALL. MY VIN # IS [XXX]. I'VE HAD A COUPLE OF NEAR ACCIDENTS BECAUSE OF THIS. I ALSO TOW A 36' FIFTH WHEEL CAMPER IN THE SUMMER TIME. *NM UPDATED 07/17/2012 *JS INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
UNWANTED ANTILOCK BRAKE ACTIVATION. SAME AS INDICATED ON NHTSA CAMPAIGN # 05V379000. WAS TOLD BY GMC MY VEHICLE WAS NOT PART OF ABOVE RECALL WITH NO REASONABLE EXPLANATION GIVE AS TO WHY. *NM
Official recalls
101V220000 · Interior Lighting
Jun 26, 2001
VEHICLE DESCRIPTION: CERTAIN PICKUP TRUCKS EQUIPPED WITH 6.6L DIESEL ENGINES FAIL TO COMPLY WITH REQUIREMENTS OF FMVSS NO. 105, "HYDRAULIC AND ELECTRIC BRAKE SYSTEMS." THESE VEHICLES HAVE A BRAKE SYSTEM WARNING LIGHT IN THE INSTRUMENT CLUSTER THAT MAY NOT ILLUMINATE WHEN THE BRAKE FLUID IS LOW. IN ADDITION, WHEN THE BRAKE FLUID IS LOW, THE VEHICLE MAY NOT MEET THE PARTIAL SYSTEM REQUIREMENTS OF FMVSS NO. 105.
Consequence & remedy
Consequence: THESE CONDITIONS COULD RESULT IN REDUCED BRAKING CAPABILITY, WHICH COULD LEAD TO A CRASH.
Remedy: DEALERS WILL CHANGE THE LOCATION OF A WIRE CONNECTION IN THE UNDERHOOD BUSSED ELECTRICAL CENTER. OWNER NOTIFICATION BEGAN JULY 9, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.
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
3EA07013 · Trailer Hitch Receiver Failure
Opened Sep 14, 2007 · Closed Sep 12, 2008
Status: closed (inferred from source dates) · Trailer Hitches
COMPLAINT REPORTS ALLEGE POOR WELD QUALITY AND/OR BENDING OF THE SUBJECT VEHICLE ORIGINAL EQUIPMENT TRAILER HITCH RECEIVER.THE AGENCY'S INVESTIGATION INCLUDED ANALYSIS OF MANUFACTURER AND AGENCY INCIDENT REPORTS, REVIEW OF POLICE REPORTS, ANALYSIS OF THE AGENCY'S FATAL ANALYSIS REPORTING SYSTEM, A VEHICLE OWNER SURVEY, INSPECTION OF TOW VEHICLES/HITCHES AND ANALYSIS OF FAILED PARTS.INCIDENTS OF WELD FAILURE WERE RARE AND ASSOCIATED WITH VERY LOW-SPEED DRIVING (TURNING, BACKING AND SUDDEN STOPPING).INCIDENTS OF BENDING WERE ASSOCIATED WITH IMPROPER TRAILER HITCH ADJUSTMENT OR OVERLOADING. A SAFETY-RELATED DEFECT HAS NOT BEEN IDENTIFIED AT THIS TIME AND FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL MONITOR THIS ISSUE AND RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE DOCUMENT SEARCH FILE FOR ADDITION INFORMATION.
PE07025 · Trailer Hitch Receiver Failure
Opened May 14, 2007 · Closed Sep 14, 2007
Status: closed (inferred from source dates) · Trailer Hitches
GM PROVIDED ADDITIONAL DATA REGARDING ALLEGATIONS OF FAILURE OF THE TRAILER HITCH.ODI REVIEWED THAT AS WELL AS OTHER DATA PROVIDED BY PEER MANUFACTURERS.BASED ON OUR REVIEW, ODI FINDS THE NEED TO FURTHER INVESTIGATE THIS ISSUE.THIS PRELIMINARY EVALUATION IS UPGRADED TO AN ENGINEERING ANALYSIS (EA07-013) FOR FURTHER ASSESSMENT AND STUDY OF THIS ISSUE.
PE04004 · Hydraulic Pump Shaft Failures
Opened Jan 8, 2004 · Closed Apr 30, 2004
Status: closed (inferred from source dates) · Service Brakes, Hydraulic; Service Brakes, Hydraulic:power Assist; Service Brakes, Hydraulic:power Assist:hydraulic; Steering:hydraulic Power Assist System; Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Additional source detail variants (5)
Service Brakes, Hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist:hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist System
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.