NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
134 reportsMileage unknown · Dec 1, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2001 CHEVROLET SIERRA 2500. THE CONTACT NOTICED THAT THE BRAKE LINES WERE CORRODED. THE DEALER AND MANUFACTURER WERE NOT NOTIFIED. THE VEHICLE WAS NOT REPAIRED. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 125,000. UPDATED 01/26/11*LJ THE CONSUMER STATED WHEN HE APPLIED THE BRAKE TO AVOID HITTING A…
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TL*THE CONTACT OWNS A 2001 CHEVROLET SIERRA 2500. THE CONTACT NOTICED THAT THE BRAKE LINES WERE CORRODED. THE DEALER AND MANUFACTURER WERE NOT NOTIFIED. THE VEHICLE WAS NOT REPAIRED. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 125,000. UPDATED 01/26/11*LJ THE CONSUMER STATED WHEN HE APPLIED THE BRAKE TO AVOID HITTING A DEER, THE BRAKE PEDAL WENT ALL THE WAY TO THE FLOOR. UPDATED 02/22/11
NHTSA ODI #10368523
169,000 miles · Nov 7, 2010
Service Brakes, HydraulicWheels
FOR ABOUT THE LAST YEAR WE HAVE BEEN HAVING ABS LIGHT ISSUES AND HAVE HAD BRAKES REPLACED, WHEEL BEARINGS REPLACED, HUBS REPLACED. MECHANIC ASSURED EVERYTHING FINE. HAVE HAD COMPLETE LOSS OF BRAKES TWICE IN LAST YEAR. LATEST FAILURE WAS ONE WEEK AGO...BRAKES FAILED, WENT TO FLOOR BUT DID NOT HIT ANYTHING AS WAS IN PARKING LOT.…
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FOR ABOUT THE LAST YEAR WE HAVE BEEN HAVING ABS LIGHT ISSUES AND HAVE HAD BRAKES REPLACED, WHEEL BEARINGS REPLACED, HUBS REPLACED. MECHANIC ASSURED EVERYTHING FINE. HAVE HAD COMPLETE LOSS OF BRAKES TWICE IN LAST YEAR. LATEST FAILURE WAS ONE WEEK AGO...BRAKES FAILED, WENT TO FLOOR BUT DID NOT HIT ANYTHING AS WAS IN PARKING LOT. MECHANIC FOUND CORROSION ON THE BRAKE LINE AND REPLACED SECTION OF THE LINE INVOLVED. *TR
NHTSA ODI #10364336
64,100 miles · Oct 23, 2010
Service Brakes, Hydraulic
BRAKE FAILURE. MY BRAKE PEDAL WENT TO THE FLOOR I DISCOVERED BRAKE FLUID LEAKING ONTO THE GROUND UNDER THE DRIVERS SIDE DOOR. UPON FURTHER INSPECTION I WAS SHOCKED TO FIND THAT MY METAL BRAKE LINES WERE CORRODED AND BURST LEAVING ME WITH NO BRAKES. TRUCK IS 2001 SIERRA 2500HD WITH 64,000 MILES. I HAVE NEVER SEEN METAL BRAKE L…
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BRAKE FAILURE. MY BRAKE PEDAL WENT TO THE FLOOR I DISCOVERED BRAKE FLUID LEAKING ONTO THE GROUND UNDER THE DRIVERS SIDE DOOR. UPON FURTHER INSPECTION I WAS SHOCKED TO FIND THAT MY METAL BRAKE LINES WERE CORRODED AND BURST LEAVING ME WITH NO BRAKES. TRUCK IS 2001 SIERRA 2500HD WITH 64,000 MILES. I HAVE NEVER SEEN METAL BRAKE LINES FAIL LIKE THIS . *TR
NHTSA ODI #10361904
93,500 miles · Oct 4, 2010
Service Brakes, Hydraulic
COMING TO A STOP LEAVING A PARKING LOT ENTERING A 45MPH ROADWAY APPLIED BRAKES THE PEDAL WENT TO THE FLOOR SWERVED MISSED REARENDING VEHICLE IN FRONT OF ME JUST MISSED BEING HIT BY CAR COMING ON MAIN ROADWAY FINALLY GOT VEHICLE STOPPED ON OPPOSITE SIDE OF THE MAIN ROAD ON TOP OF THE SIDEWALK/GRASS BY SLAMMING E BRAKE ON. AFTER H…
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COMING TO A STOP LEAVING A PARKING LOT ENTERING A 45MPH ROADWAY APPLIED BRAKES THE PEDAL WENT TO THE FLOOR SWERVED MISSED REARENDING VEHICLE IN FRONT OF ME JUST MISSED BEING HIT BY CAR COMING ON MAIN ROADWAY FINALLY GOT VEHICLE STOPPED ON OPPOSITE SIDE OF THE MAIN ROAD ON TOP OF THE SIDEWALK/GRASS BY SLAMMING E BRAKE ON. AFTER HAVING TRUCK CHECKED OUT THE BRAKE LINES ARE SO ROTTED THERE IS A HOLE IN ONE UNDER THE DRIVERS DOOR AREA. THE HOLE SYSTEM IS SO ROTTED IT NEED TO BE REPLACED. *TR
NHTSA ODI #10359138
90,300 miles · Sep 13, 2010
Engine And Engine CoolingPower Train
I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92000 MILES ON IT. WITH THE BRAKE LINE PROBLEM I RECENTLY HAD I FIGURED I SHOULD REPORT THE OTHER ISSUES THAT I DON?T THINK I SHOULD BE HAVING WITH A VEHICLE THAT IS LESS THAN 10 YEARS OLD. THE OIL COOLER LINES AND THE TRANS…
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I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92000 MILES ON IT. WITH THE BRAKE LINE PROBLEM I RECENTLY HAD I FIGURED I SHOULD REPORT THE OTHER ISSUES THAT I DON?T THINK I SHOULD BE HAVING WITH A VEHICLE THAT IS LESS THAN 10 YEARS OLD. THE OIL COOLER LINES AND THE TRANSMISSION COOLER LINES HAVE ALL RUSTED THROUGH AND HAVE HAD TO BE REPLACED. ALONG WITH THE LINES, THE CONNECTORS FOR THE LINES HAVE ALL HAD TO BE REPLACED DUE TO CATASTROPHIC FAILURE (THEY RUSTED SO BAD THAT WERE FALLING APART). IF THE VEHICLE WAS 20 YEARS OLD I MIGHT EXPECT THIS PROBLEM, BUT NOT ON ONE LESS THAN 10 YEARS OLD AND THE MILEAGE THAT IT HAS. *TR
NHTSA ODI #10355178
90,300 miles · Sep 13, 2010
Service Brakes, Hydraulic
I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92,000 MILES ON IT. ON AUGUST 25, 2010 I WAS TRAVELING APPROXIMATELY 45 MPH TOWING A 14? TRAILER AS I APPROACHED AN INTERSECTION WHERE THE LIGHT CHANGED. THE ROAD SURFACE WAS ROUGH. I APPLIED THE BRAKES FIRMLY SO THAT I COU…
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I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92,000 MILES ON IT. ON AUGUST 25, 2010 I WAS TRAVELING APPROXIMATELY 45 MPH TOWING A 14? TRAILER AS I APPROACHED AN INTERSECTION WHERE THE LIGHT CHANGED. THE ROAD SURFACE WAS ROUGH. I APPLIED THE BRAKES FIRMLY SO THAT I COULD STOP FOR THE INTERSECTION. DUE TO THE ROUGH ROAD THE ABS KICKED IN AND WHEN IT DID MY BRAKE PEDAL WENT COMPLETELY TO THE FLOOR AND I HAD NO BRAKES. I TRIED PUMPING THE BRAKES, BUT NOTHING. BY THE GRACE OF GOD, NO ONE WAS HURT AS I CONTINUED INTO CROSS TRAFFIC AT THE INTERSECTION. AFTER PULLING INTO THE CLOSEST GAS STATION, I FOUND THAT THE BRAKE LINES GOING FROM THE MASTER CYLINDER HAD BOTH BLOWN OUT. ONCE I HAD THE VEHICLE HOME I INSPECTED THE BRAKE LINES AND FOUND ALL THE LINES IN EXTREMELY BAD CONDITION. IN FACT THE LINES GOING TO THE FRONT BRAKES WERE SEEPING BRAKE FLUID. HAVING OWNED MANY VEHICLES, MOST OLDER THAN THIS ONE, I WAS SHOCKED THAT BRAKE LINES WERE IN AS BAD A CONDITION AS THEY ARE. ESPECIALLY IN A VEHICLE THAT ISN'T EVEN 10 YEARS OLD YET. BRAKE LINE FAILURE IS A CATASTROPHE WAITING TO HAPPEN. THE DEALERSHIP INDICATED THAT GM IS NOT STEPPING UP TO THIS PROBLEM - HOPEFULLY YOU WILL ENCOURAGE THEM TOO. *TR
NHTSA ODI #10355174
Mileage unknown · Sep 13, 2010
Engine And Engine Cooling
I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92,000 MILES ON IT. DURING THE TIME I HAVE OWNED IT, IT HAS HAD A PROBLEM WITH THE EXHAUST MANIFOLDS COMING LOOSE, DUE TO LOOSING STUDS, BROKEN STUDS OR THE STUDS JUST FALLING OUT. THE TWO DEALERSHIPS HAVE REPAIRED THIS PROB…
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I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92,000 MILES ON IT. DURING THE TIME I HAVE OWNED IT, IT HAS HAD A PROBLEM WITH THE EXHAUST MANIFOLDS COMING LOOSE, DUE TO LOOSING STUDS, BROKEN STUDS OR THE STUDS JUST FALLING OUT. THE TWO DEALERSHIPS HAVE REPAIRED THIS PROBLEM FOUR OR FIVE TIMES WHILE UNDER WARRANTY AND THE PROBLEM HAS OCCURRED AGAIN. I HAVE NEVER SEEN THIS KIND OF PROBLEM ON ANY OTHER VEHICLE THAT I HAVE OWNED AND I HAVE OWNED MANY VEHICLES. THE DANGER THAT THIS PROBLEM CREATES IS THE POSSIBILITY OF FIRE AND CARBON MONOXIDE IN THE CAB OF THE TRUCK. GM/THE DEALERSHIPS REFUSE TO ADDRESS THIS ISSUE, SO I AM FORCED TO TURN IT OVER TO YOU. *TR
NHTSA ODI #10355168
65,000 miles · Sep 3, 2010
Structure
TL*THE CONTACT OWNS A 2001 GMC 2500 HD. THE CONTACT STATED THAT THE FRAME OF THE VEHICLE WAS CORRODING. THE FAILURE CAUSED THE CONTACT TO REPLACE THE BRAKE LINES TWICE. THE CONTACT STATED THAT THE VEHICLE HAD TO BE INSPECTED EVERY YEAR AND THE VEHICLE STARTED CORRODING TWO YEARS AGO. THE DEALER STATED THAT THE FRAME MAY NEED TO …
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TL*THE CONTACT OWNS A 2001 GMC 2500 HD. THE CONTACT STATED THAT THE FRAME OF THE VEHICLE WAS CORRODING. THE FAILURE CAUSED THE CONTACT TO REPLACE THE BRAKE LINES TWICE. THE CONTACT STATED THAT THE VEHICLE HAD TO BE INSPECTED EVERY YEAR AND THE VEHICLE STARTED CORRODING TWO YEARS AGO. THE DEALER STATED THAT THE FRAME MAY NEED TO BE REPLACED. THE FAILURE MILEAGE WAS 65000 AND THE CURRENT MILEAGE WAS 84000.
NHTSA ODI #10353656
106,000 miles · Aug 13, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2001 GMC SIERRA 2500. WHILE TRAVELING 4 TO 10 MPH THE CONTACT APPLIED THE BRAKES AND NOTICED THAT THE VEHICLE WOULD VIBRATE AND THE STOPPING DISTANCE HAD INCREASED. THE VEHICLE WAS TAKEN TO A LOCAL MECHANIC WHERE THE ANTI LOCK BRAKE SENSOR WAS REPLACED; HOWEVER, THE FAILURE CONTINUED TO OCCUR. THERE WERE NO…
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TL*THE CONTACT OWNS A 2001 GMC SIERRA 2500. WHILE TRAVELING 4 TO 10 MPH THE CONTACT APPLIED THE BRAKES AND NOTICED THAT THE VEHICLE WOULD VIBRATE AND THE STOPPING DISTANCE HAD INCREASED. THE VEHICLE WAS TAKEN TO A LOCAL MECHANIC WHERE THE ANTI LOCK BRAKE SENSOR WAS REPLACED; HOWEVER, THE FAILURE CONTINUED TO OCCUR. THERE WERE NO PRIOR WARNINGS. THE FAILURE MILEAGE WAS 106000 AND THE CURRENT MILEAGE WAS 107000.
NHTSA ODI #10349269
158,500 miles · Aug 10, 2010
Electrical SystemFire
TL*THE CONTACT OWNS A 2001 CHEVROLET K2500 HD SILVERADO. THE CONTACT STATED THAT THE FUEL INJECTORS ON THE VEHICLE ARE BAD AND THE FAILURE IS CAUSED BY A FAULTY WIRING HARNESS. A LOCAL MECHANIC STATED THAT IN ORDER TO REPAIR THE FAILURE THE WIRING HARNESS AND FUEL INJECTORS MUST BOTH BE REPLACED. GM WAS CONTACTED AND STATED T…
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TL*THE CONTACT OWNS A 2001 CHEVROLET K2500 HD SILVERADO. THE CONTACT STATED THAT THE FUEL INJECTORS ON THE VEHICLE ARE BAD AND THE FAILURE IS CAUSED BY A FAULTY WIRING HARNESS. A LOCAL MECHANIC STATED THAT IN ORDER TO REPAIR THE FAILURE THE WIRING HARNESS AND FUEL INJECTORS MUST BOTH BE REPLACED. GM WAS CONTACTED AND STATED THAT THEY HAD EXTENDED THE WARRANTY ON THE VEHICLES FOR THIS FAILURE TO 7 YEARS OR 200,000 MILES, WHICHEVER CAME FIRST. THE CONTACTS 7 YEAR PERIOD HAD EXPIRED SO THE REPAIRS WOULD BE AT HER EXPENSE. THE FAILURE AND CURRENT MILEAGES WERE APPROXIMATELY 158,500.
NHTSA ODI #10348421
NHTSA investigations
2EA06016 · Crank Position Sensor Failure - Stall
Opened Sep 14, 2006 · Closed Nov 9, 2007
Status: closed (inferred from source dates) · Engine And Engine Cooling; Engine And Engine Cooling:engine
IN A LETTER DATED NOVEMBER 7, 2007, GENERAL MOTORS (GM) REPORTED TO THE OFFICE OF DEFECTS INVESTIGATION (ODI) THAT IT WILL CONDUCT A SAFETY RECALL (07V-521) TO REPLACE THE CRANK POSITION SENSOR (CKP) IN APPROXIMATELY 12,000 MODEL YEAR (MY) 2001 CHEVROLET SILVERADO AND GMC SIERRA VEHICLES EQUIPPED WITH 8.1 LITER ENGINES MANUFACTURED ON OR BEFORE NOVEMBER 15, 2000.ACCORDING TO GM, THE CKP CAN FAIL INTERMITTENTLY OR PERMANENTLY.A PERMANENT CKP FAILURE WOULD RESULT IN AN ENGINE STALL WITHOUT RESTART.AN INTERMITTENT CKP FAILURE COULD CAUSE THE SERVICE ENGINE SOON LIGHT TO ILLUMINATE, THE VEHICLE TO RUN ROUGH OR THE ENGINE TO STALL BUT ALLOWS RESTART.AS A REMEDY, AN IMPROVED CKP WILL BE INSTALLED IN THE SUBJECT VEHICLES.THE RECALL CAMPAIGN WILL START IN DECEMBER 2007. DURING THE PRELIMINARY EVALUATION (PE06-016), AND THIS EA INVESTIGATION, GM AND ODI INDEPENDENTLY CONDUCTED DETAILED REVIEWS OF CERTAIN FIELD DATA TO UNDERSTAND THE NATURE AND RATE OF SUBJECT VEHICLE STALLING DUE TO CKP FAILURES.GM AND ODI REVIEWED GM'S WARRANTY CLAIMS FOR THE CKP WITH THE OBJECTIVE OF ASCERTAINING AN ESTIMATE OF THOSE CLAIMS REPRESENTING AN ENGINE STALL WHILE DRIVING.THE CKP WARRANTY CLAIMS WITHOUT VERBATIM TEXT WERE THE LARGEST SEGMENT OF WARRANTY CLAIMS.USING THOSE CLAIMS, GM SURVEYED VEHICLE OWNERS TO GATHER ADDITIONAL INFORMATION TO DETERMINE IF THE CLAIM WAS ASSOCIATED WITH A STALL WHILE DRIVING EVENT.BASED ON THE SURVEY, GM ESTIMATED THAT APPROXIMATELY 49% OF ALL WARRANTY REPAIRS FOR THE CKP INVOLVED A STALL WHILE DRIVING.ODI?S REVIEW OF GM'S SURVEY DATA PRODUCED A HIGHER ESTIMATE (71%) FOR STALL WHILE DRIVING.GM FURTHER ESTIMATED THE RATE OF STALL WHILE DRIVING FOR THE SUBJECT VEHICLES OVER TIME.IT ESTIMATED STALLING WHILE DRIVING RATES OF 1.6%, 4.6% AND 8.9% AT 1, 3 AND 6 YEARS IN SERVICE RESPECTIVELY.ODI'S REVIEW OF THE GM'S SURVEY DATA FINDS HIGHER ESTIMATED STALL WHILE DRIVING RATES OF 2.2%, 6.8% AND 13% AT 1, 3 AND 6 YEARS IN SERVICE RESPECTIVELY. ODI ALSO CONDUCTED A SURVEY OF VEHICLE OWNERS USING CONSUMER COMPLAINTS REPORTED TO BOTH ODI AND GM.THE OBJECTIVE WAS TO ASCERTAIN THE POTENTIAL SAFETY CONSEQUENCES OF AN ENGINE STALL DUE TO THE ALLEGED DEFECT.WITH RESPECT TO THE ABILITY TO RESTART THE VEHICLE AFTER A STALL, 11% REPORTED IMMEDIATE RESTART, 69% REPORTED DELAYED RESTART AND 20% REPORTED NO RESTART.OVER HALF NOTED AT LEAST ONE ENGINE STALL INCIDENT AT SPEEDS IN EXCESS OF 40MPH. ABOUT ONE-THIRD NOTED THE VEHICLE WAS STRANDED EITHER PARTIALLY OR FULLY IN A LANE OF TRAFFIC AFTER THE ENGINE STALL.ALL OF THE CONSUMERS SURVEYED NOTED MULTIPLE STALLING EVENTS PRIOR TO PROPER DIAGNOSIS AND REPLACEMENT OF THE CKP.BASED ON GM'S DECISION TO CONDUCT A SAFETY RECALL, THIS INVESTIGATION IS CLOSED.
Additional source detail variants (2)
Engine And Engine Cooling:engine
IN A LETTER DATED NOVEMBER 7, 2007, GENERAL MOTORS (GM) REPORTED TO THE OFFICE OF DEFECTS INVESTIGATION (ODI) THAT IT WILL CONDUCT A SAFETY RECALL (07V-521) TO REPLACE THE CRANK POSITION SENSOR (CKP) IN APPROXIMATELY 12,000 MODEL YEAR (MY) 2001 CHEVROLET SILVERADO AND GMC SIERRA VEHICLES EQUIPPED WITH 8.1 LITER ENGINES MANUFACTURED ON OR BEFORE NOVEMBER 15, 2000.ACCORDING TO GM, THE CKP CAN FAIL INTERMITTENTLY OR PERMANENTLY.A PERMANENT CKP FAILURE WOULD RESULT IN AN ENGINE STALL WITHOUT RESTART.AN INTERMITTENT CKP FAILURE COULD CAUSE THE SERVICE ENGINE SOON LIGHT TO ILLUMINATE, THE VEHICLE TO RUN ROUGH OR THE ENGINE TO STALL BUT ALLOWS RESTART.AS A REMEDY, AN IMPROVED CKP WILL BE INSTALLED IN THE SUBJECT VEHICLES.THE RECALL CAMPAIGN WILL START IN DECEMBER 2007. DURING THE PRELIMINARY EVALUATION (PE06-016), AND THIS EA INVESTIGATION, GM AND ODI INDEPENDENTLY CONDUCTED DETAILED REVIEWS OF CERTAIN FIELD DATA TO UNDERSTAND THE NATURE AND RATE OF SUBJECT VEHICLE STALLING DUE TO CKP FAILURES.GM AND ODI REVIEWED GM'S WARRANTY CLAIMS FOR THE CKP WITH THE OBJECTIVE OF ASCERTAINING AN ESTIMATE OF THOSE CLAIMS REPRESENTING AN ENGINE STALL WHILE DRIVING.THE CKP WARRANTY CLAIMS WITHOUT VERBATIM TEXT WERE THE LARGEST SEGMENT OF WARRANTY CLAIMS.USING THOSE CLAIMS, GM SURVEYED VEHICLE OWNERS TO GATHER ADDITIONAL INFORMATION TO DETERMINE IF THE CLAIM WAS ASSOCIATED WITH A STALL WHILE DRIVING EVENT.BASED ON THE SURVEY, GM ESTIMATED THAT APPROXIMATELY 49% OF ALL WARRANTY REPAIRS FOR THE CKP INVOLVED A STALL WHILE DRIVING.ODI?S REVIEW OF GM'S SURVEY DATA PRODUCED A HIGHER ESTIMATE (71%) FOR STALL WHILE DRIVING.GM FURTHER ESTIMATED THE RATE OF STALL WHILE DRIVING FOR THE SUBJECT VEHICLES OVER TIME.IT ESTIMATED STALLING WHILE DRIVING RATES OF 1.6%, 4.6% AND 8.9% AT 1, 3 AND 6 YEARS IN SERVICE RESPECTIVELY.ODI'S REVIEW OF THE GM'S SURVEY DATA FINDS HIGHER ESTIMATED STALL WHILE DRIVING RATES OF 2.2%, 6.8% AND 13% AT 1, 3 AND 6 YEARS IN SERVICE RESPECTIVELY. ODI ALSO CONDUCTED A SURVEY OF VEHICLE OWNERS USING CONSUMER COMPLAINTS REPORTED TO BOTH ODI AND GM.THE OBJECTIVE WAS TO ASCERTAIN THE POTENTIAL SAFETY CONSEQUENCES OF AN ENGINE STALL DUE TO THE ALLEGED DEFECT.WITH RESPECT TO THE ABILITY TO RESTART THE VEHICLE AFTER A STALL, 11% REPORTED IMMEDIATE RESTART, 69% REPORTED DELAYED RESTART AND 20% REPORTED NO RESTART.OVER HALF NOTED AT LEAST ONE ENGINE STALL INCIDENT AT SPEEDS IN EXCESS OF 40MPH. ABOUT ONE-THIRD NOTED THE VEHICLE WAS STRANDED EITHER PARTIALLY OR FULLY IN A LANE OF TRAFFIC AFTER THE ENGINE STALL.ALL OF THE CONSUMERS SURVEYED NOTED MULTIPLE STALLING EVENTS PRIOR TO PROPER DIAGNOSIS AND REPLACEMENT OF THE CKP.BASED ON GM'S DECISION TO CONDUCT A SAFETY RECALL, THIS INVESTIGATION IS CLOSED.
Engine And Engine Cooling
IN A LETTER DATED NOVEMBER 7, 2007, GENERAL MOTORS (GM) REPORTED TO THE OFFICE OF DEFECTS INVESTIGATION (ODI) THAT IT WILL CONDUCT A SAFETY RECALL (07V-521) TO REPLACE THE CRANK POSITION SENSOR (CKP) IN APPROXIMATELY 12,000 MODEL YEAR (MY) 2001 CHEVROLET SILVERADO AND GMC SIERRA VEHICLES EQUIPPED WITH 8.1 LITER ENGINES MANUFACTURED ON OR BEFORE NOVEMBER 15, 2000.ACCORDING TO GM, THE CKP CAN FAIL INTERMITTENTLY OR PERMANENTLY.A PERMANENT CKP FAILURE WOULD RESULT IN AN ENGINE STALL WITHOUT RESTART.AN INTERMITTENT CKP FAILURE COULD CAUSE THE SERVICE ENGINE SOON LIGHT TO ILLUMINATE, THE VEHICLE TO RUN ROUGH OR THE ENGINE TO STALL BUT ALLOWS RESTART.AS A REMEDY, AN IMPROVED CKP WILL BE INSTALLED IN THE SUBJECT VEHICLES.THE RECALL CAMPAIGN WILL START IN DECEMBER 2007. DURING THE PRELIMINARY EVALUATION (PE06-016), AND THIS EA INVESTIGATION, GM AND ODI INDEPENDENTLY CONDUCTED DETAILED REVIEWS OF CERTAIN FIELD DATA TO UNDERSTAND THE NATURE AND RATE OF SUBJECT VEHICLE STALLING DUE TO CKP FAILURES.GM AND ODI REVIEWED GM'S WARRANTY CLAIMS FOR THE CKP WITH THE OBJECTIVE OF ASCERTAINING AN ESTIMATE OF THOSE CLAIMS REPRESENTING AN ENGINE STALL WHILE DRIVING.THE CKP WARRANTY CLAIMS WITHOUT VERBATIM TEXT WERE THE LARGEST SEGMENT OF WARRANTY CLAIMS.USING THOSE CLAIMS, GM SURVEYED VEHICLE OWNERS TO GATHER ADDITIONAL INFORMATION TO DETERMINE IF THE CLAIM WAS ASSOCIATED WITH A STALL WHILE DRIVING EVENT.BASED ON THE SURVEY, GM ESTIMATED THAT APPROXIMATELY 49% OF ALL WARRANTY REPAIRS FOR THE CKP INVOLVED A STALL WHILE DRIVING.ODI?S REVIEW OF GM'S SURVEY DATA PRODUCED A HIGHER ESTIMATE (71%) FOR STALL WHILE DRIVING.GM FURTHER ESTIMATED THE RATE OF STALL WHILE DRIVING FOR THE SUBJECT VEHICLES OVER TIME.IT ESTIMATED STALLING WHILE DRIVING RATES OF 1.6%, 4.6% AND 8.9% AT 1, 3 AND 6 YEARS IN SERVICE RESPECTIVELY.ODI'S REVIEW OF THE GM'S SURVEY DATA FINDS HIGHER ESTIMATED STALL WHILE DRIVING RATES OF 2.2%, 6.8% AND 13% AT 1, 3 AND 6 YEARS IN SERVICE RESPECTIVELY. ODI ALSO CONDUCTED A SURVEY OF VEHICLE OWNERS USING CONSUMER COMPLAINTS REPORTED TO BOTH ODI AND GM.THE OBJECTIVE WAS TO ASCERTAIN THE POTENTIAL SAFETY CONSEQUENCES OF AN ENGINE STALL DUE TO THE ALLEGED DEFECT.WITH RESPECT TO THE ABILITY TO RESTART THE VEHICLE AFTER A STALL, 11% REPORTED IMMEDIATE RESTART, 69% REPORTED DELAYED RESTART AND 20% REPORTED NO RESTART.OVER HALF NOTED AT LEAST ONE ENGINE STALL INCIDENT AT SPEEDS IN EXCESS OF 40MPH. ABOUT ONE-THIRD NOTED THE VEHICLE WAS STRANDED EITHER PARTIALLY OR FULLY IN A LANE OF TRAFFIC AFTER THE ENGINE STALL.ALL OF THE CONSUMERS SURVEYED NOTED MULTIPLE STALLING EVENTS PRIOR TO PROPER DIAGNOSIS AND REPLACEMENT OF THE CKP.BASED ON GM'S DECISION TO CONDUCT A SAFETY RECALL, THIS INVESTIGATION IS CLOSED.
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.
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