NHTSA owner reports · September 18, 2026 snapshot.
Power Train complaints
19 reportsClear category filter135,000 miles · Aug 18, 2008
Power Train
TL*THE CONTACT OWNS A 2001 CHEVROLET SILVERADO 1500. WHILE DRIVING 70 MPH, THE VEHICLE SWITCHED FROM TWO WHEEL TO FOUR WHEEL DRIVE AUTOMATICALLY. AS A RESULT, THE TRANSFER CASE DETACHED FROM THE BACK OF THE TRANSMISSION AND THE DRIVESHAFT FELL OUT AND LOCKED UP THE VEHICLE. THE FOUR WHEEL DRIVE LIGHT ILLUMINATED PRIOR TO THE F…
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TL*THE CONTACT OWNS A 2001 CHEVROLET SILVERADO 1500. WHILE DRIVING 70 MPH, THE VEHICLE SWITCHED FROM TWO WHEEL TO FOUR WHEEL DRIVE AUTOMATICALLY. AS A RESULT, THE TRANSFER CASE DETACHED FROM THE BACK OF THE TRANSMISSION AND THE DRIVESHAFT FELL OUT AND LOCKED UP THE VEHICLE. THE FOUR WHEEL DRIVE LIGHT ILLUMINATED PRIOR TO THE FAILURE. THE CONTACT DID NOT DRIVE OVER A POTHOLE. THE VEHICLE WAS TOWED TO THE CONTACT'S RESIDENCE FOR REPAIR. THE FAILURE MILEAGE WAS 135,000.
NHTSA ODI #10238747
59,000 miles · Oct 23, 2006
Power Train
DT*: THE CONTACT STATED WHILE DRIVING 70 MPH, THE TRANSMISSION BURNED UP. THE TORQUE CONVERTER HAD RUBBED ON THE TRANSMISSION. THE VEHICLE WAS TAKEN TO A SERVICE DEALER, WHO DETERMINED THE TORQUE CONVERTER HAD BURNED UP AND NEEDED TO BE REPLACED. UPDATED 10/23/06. *JB
NHTSA ODI #10171639
20,000 miles · Sep 29, 2005
Power TrainService Brakes, Hydraulic
DT: THE CONTACT OWNS A 2001 CHEVROLET TRUCK AND WAS HAVING PROBLEMS WITH THE BRAKES. THE FIRST TIME THERE WAS AN INCIDENT WHERE HE TRIED TO STOP THE VEHICLE BUT COULD NOT STOP. AS A RESULT THE CONSUMER'S VEHICLE HIT ANOTHER VEHICLE. THE SECOND TIME THE CONSUMER WAS TRYING TO STOP FOR A STOP SIGN BUT COULD NOT STOP. THE…
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DT: THE CONTACT OWNS A 2001 CHEVROLET TRUCK AND WAS HAVING PROBLEMS WITH THE BRAKES. THE FIRST TIME THERE WAS AN INCIDENT WHERE HE TRIED TO STOP THE VEHICLE BUT COULD NOT STOP. AS A RESULT THE CONSUMER'S VEHICLE HIT ANOTHER VEHICLE. THE SECOND TIME THE CONSUMER WAS TRYING TO STOP FOR A STOP SIGN BUT COULD NOT STOP. THE SERVICE DEALER TURNED THE ROTORS AT 4,000 MILES. THE FIRST TIME THE DEALER REPLACED THE BOTH FRONT BEARINGS AND ABS SENSORS. THE CONSUMER HAD TO PAY FOR THIS REPAIR. THIS TIME THE SERVICE DEALER REPLACED RIGHT AND LEFT HUB AND THE ABS SENSOR.*AK THE ABS ACTIVATED AS THE VEHICLE WAS SLOWING DOWN. THE ROTORS HAD TO BE TURNED AT 4000 MILES. *NM
NHTSA ODI #10132835
38,000 miles · Jul 14, 2005
Power Train
DT THE DEALERSHIP CAME ON JUNE 27TH, 2005. THE DIFFERENTIAL THAT DRIVES THE WHEELS IN THE BACK ON THE VAN MADE A NOISE. TOOK VEHICLE TO THE DEALER 5 OR 6 TIMES, THEY REBUILT IT TWICE, AND KEPT SAYING IT WAS ALRIGHT TO DRIVE. MY WIFE WAS DRIVING , AND IT LOCKED UP. THE VEHICLE IS CURRENTLY AT THE DEALERSHIP. *AK
NHTSA ODI #10128740
25,000 miles · Apr 19, 2005
Power Train
CLUNG NOISE IN DRIVELINE LIKE SLOOP. *AK
NHTSA ODI #10118138
Mileage unknown · Jan 6, 2005
Electrical SystemEngine And Engine CoolingExterior Lighting
THE CONSUMER REQUESTED ASSISTANCE FOR 15 FAILURES AND OR PROBLEMS WITH GM 2001 CHEVY TRUCK. *BF THE STEERING ROD ASSEMBLY WOULD POP WHEN THE STEERING WHEEL WAS TURNED, THE SHIFTER BOOT RIPPED IMMEDIATELY, THE TAILGATE STRAPS BROKE AND BENT THE TAILGATE, THE PCV VALVE WAS USING 4 QUARTS OF OIL AND THE DEALER WAS UNABLE TO FIN…
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THE CONSUMER REQUESTED ASSISTANCE FOR 15 FAILURES AND OR PROBLEMS WITH GM 2001 CHEVY TRUCK. *BF THE STEERING ROD ASSEMBLY WOULD POP WHEN THE STEERING WHEEL WAS TURNED, THE SHIFTER BOOT RIPPED IMMEDIATELY, THE TAILGATE STRAPS BROKE AND BENT THE TAILGATE, THE PCV VALVE WAS USING 4 QUARTS OF OIL AND THE DEALER WAS UNABLE TO FIND THE PROBLEM, THE BATTERY EXPLODED AT 40K MILES, THE RIGHT REAR BRAKE ON THE INSIDE HAD WORN DOWN THE METAL, THE LIGHTS ON THE STEREO BURNED OUT, THE LIGHTS HAD BURNED OUT, THE VALVE COVER WERE LEAKING OIL BEFORE 100K MILES, THE FUR WHEEL DRIVE SWITCH HAD BROKEN AT 50K MILES, THE TRANSMISSION DID NOT SHIFT AT 1K MILES AND THE DEALERS WERE UNABLE TO FIND THE PROBLEM, THE ENGINE EXPERIENCED A PRE-IGNITION KNOCK AND THE DEALER WAS UNABLE TO FIND THE PROBLEM, THE DRIVER'S SEAT CONTROLS RIPPED AT 60K MILES, THE TRANSMISSION HAD COMPLETE GONE OUT AT 118K MILES AND THE SEAT BELTS LATCH SYSTEM HAD BECOME DEFECTIVE. *SC
NHTSA ODI #10109401
20,000 miles · May 21, 2004
Engine And Engine CoolingExterior LightingParking Brake
PARKING BRAKE HASN'T WORKED SINCE AROUND 20000 MILES, BRAKE WILL DEPRESS, BUT WON'T KEEP TRUCK FROM ROLLING. LOUD PISTON SLAP, KNOCKING FROM ENGINE MOSTLY WHEN ENGINE IS COLD, GOES AWAY AFTER WARMED UP. THIS IS A Z71 AND THE 4 WHEEL DRIVE BUTTONS DO NOT WORK ALL THE TIME WHEN TRYING TO PUT INTO 4 WHEEL DRIVE. POWER MIRRORS DON'T…
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PARKING BRAKE HASN'T WORKED SINCE AROUND 20000 MILES, BRAKE WILL DEPRESS, BUT WON'T KEEP TRUCK FROM ROLLING. LOUD PISTON SLAP, KNOCKING FROM ENGINE MOSTLY WHEN ENGINE IS COLD, GOES AWAY AFTER WARMED UP. THIS IS A Z71 AND THE 4 WHEEL DRIVE BUTTONS DO NOT WORK ALL THE TIME WHEN TRYING TO PUT INTO 4 WHEEL DRIVE. POWER MIRRORS DON'T WORK A LOT OF THE TIME. AT LEAST ONE OF THE FRONT RUNNING LIGHTS STAY BURNED OUT MOST OF THE TIME. TRUCK IS OUT OF WARRANTY NOW BUT THESE PROBLEMS HAVE EXISTED FOR A LONG TIME. A LOT OF OTHER TRUCKS OF THIS SAME MODEL HAVE ALL THE SAME PROBLEMS. GM SHOULD ADDRESS THESE PROBLEMS AND MAKE THEM RIGHT AT NO COST TO THE CONSUMER.*AK
NHTSA ODI #10072959
Mileage unknown · Apr 28, 2004
Power TrainCrash
WHILE MAKING A TURN REAR END LOCKED UP. THIS CAUSED THE VEHICLE TO PULL HARD, SKID, AND COME TO AN ABRUPT HALT. THIS PROBLEM WAS DUE TO REAR DIFFERENTIAL FAILURE.*AK
NHTSA ODI #10071770
12,000 miles · Jan 1, 2004
Electrical SystemEngine And Engine CoolingParking Brake
NOTHING BUT PROBLEMS WITH TRUCK. FIRST WAS THE SLIP YOKE IN THE DRIVE SHAFT, FELT LIKE TRANNY WAS SLIPPING FROM TAKE OFF AT START POSITION. REPLACED UNDER WARRANTY.*AK ANTI-LOCK BRAKES WOULD COME ON WITH EVERY STOP. USUALLY AT VERY SLOW SPEEDS, CAUSING TRUCK TO EXCEED 5-10 FT FURTHER THAN IT SHOULD HAVE. HAD FRONT WHEEL …
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NOTHING BUT PROBLEMS WITH TRUCK. FIRST WAS THE SLIP YOKE IN THE DRIVE SHAFT, FELT LIKE TRANNY WAS SLIPPING FROM TAKE OFF AT START POSITION. REPLACED UNDER WARRANTY.*AK ANTI-LOCK BRAKES WOULD COME ON WITH EVERY STOP. USUALLY AT VERY SLOW SPEEDS, CAUSING TRUCK TO EXCEED 5-10 FT FURTHER THAN IT SHOULD HAVE. HAD FRONT WHEEL BEARING REPLACED, FIXED FOR SOME TIME DOING IT AGAIN. ALSO IN THE MEAN TIME, HAD TO HAVE ALL BRAKES AND ROTORS REPLACED. BRAKE SYSTEM IS AWFUL. THIS COULD CAUSE ACCIDENTS. ALSO, HAS COLD ENGINE KNOCK, VERY LOUD KNOCK, NOT A NORMAL KNOCK. SOMETHING ISNT RIGHT WITH THIS. DONE THIS SINCE A LITTLE OVER 20,000 MILES, WORSE WHEN TEMPERATURES OUTSIDE ARE LOW. HAD TO HAVE 4X4 SWITCH ON DASH REPLACED. KEPT GETTING SERVICE 4WD UNIT. OUT OF WARRANTY AT THIS TIME. I KNOW OF AT LEAST 4 OTHER WITH ALL SAME PROBLEMS. STILL NOTHING DONE WITH GM, SOMETHING SHOULD BE DONE. ESPECIALLY WITH THE BRAKE SYSTEM. SAFETY HAZARD.
NHTSA ODI #10051467
NHTSA investigations
2EA04011 · Parking Brake Failure
Opened Apr 9, 2004 · Closed May 10, 2005
Status: closed (inferred from source dates) · Parking Brake; Parking Brake:conventional; Parking Brake:conventional:mechanical; Parking Brake:conventional:mechanical:linkage And Cable
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Additional source detail variants (4)
Parking Brake:conventional
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake:conventional:mechanical
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake:conventional:mechanical:linkage And Cable
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
PE03057 · Parking Brake Failure
Opened Dec 8, 2003 · Closed Apr 9, 2004
Status: closed (inferred from source dates) · Parking Brake
ODI OPENED PE03-057 TO ASSESS PARKING BRAKE INEFFECTIVENESS IN THE SUBJECT VEHICLES.THESE VEHICLES ARE EQUIPPED WITH FOUR WHEEL DISC BRAKES THAT INCORPORATE A SINGLE-SHOE DRUM-IN-HAT PARKING BRAKE INDEPENDENT OF THE SERVICE BRAKES.COMPLAINT AND WARRANTY DATA INDICATE THAT THE PARKING BRAKE LININGS TEND TO WEAR OUT EARLY IN THE LIFE OF THE VEHICLE (AT AN AVERAGE OF 24 MONTHS IN SERVICE), REDUCING THE PARKING BRAKE SYSTEM'S TORQUE BELOW THAT NEEDED TO IMMOBILIZE THE VEHICLE.GM HAS ATTRIBUTED THIS ACCELERATED WEAR TO FOREIGN MATERIAL INTRUSION AND A FAILURE OF THE BRAKE SHOE TO PROPERLY SELF-CENTER WITHIN ITS BRAKE DRUM.EFFECTIVE WITH THE START OF MY 2003 PRODUCTION, A NEWER REDUCED FORCE HOLD-DOWN CLIP WAS INTRODUCED TO FACILITATE BRAKE SHOE DISENGAGEMENT FROM THE DRUM SURFACE.THIS PART IS ALSO AVAILABLE AT THE SERVICE LEVEL FOR THE MY 1999-2002 VEHICLES.GM HAS INDICATED THAT THE PAKING BRAKE IS INTENDED TO OPERATE IN CONJUNCTION WITH THE TRANSMISSION TO IMMOBILZE PARKED VEHICLES, AND THAT IN MANY CASES, ACCELERATED PARKING BRAKE LINING WEAR IS CAUSED BY ROUGH USE, VEHICLE MODIFICATIONS, AND DRIVING WITH THE PARKING ENGAGED. ODI HAS UPGRADED THE PRELIMINARY EVALUATION TO AN ENGINEERING ANALYSIS TO GATHER FURTHER INFORMATION CONCERNING PARKING BRAKE USAGE FACTORS AND THE CIRCUMSTANCES SURROUNDING THE SEVENTEEN REPORTED VEHICLE CRASHES.
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