IllustrationABS locks up because of faulty wheel speed sensors known problem locking up brake pedal resulting in loss of control of vehicle causing collisions and dangerous situations.
2001 Chevrolet Silverado 1500
Owner reports · Recalls · Investigations
Similar to other model years
Owner complaints for the 2001 Chevrolet Silverado 1500 do not stand out strongly from the model-year median of 525.
About this comparison →How this year compares
Owner complaints by model year
Compare all Silverado 1500 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
290–25K
3825–50K
7150–75K
8075–100K
102100–150K
65150K+
385 reports with mileage · 83 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 147 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 133 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Fuel System, Gasoline. Review the 32 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
48 crash reports5 fire reports20 injury reports
Vehicle Speed Control complaints
10 reportsEVAPORATED SYSTEM.
TL* THE CONTACT OWNS A 2001 CHEVROLET SILVERADO 1500. WHILE DRIVING VARIOUS SPEEDS, THE ABS WARNING LIGHT ILLUMINATED AND THE BRAKES FAILED TO ENGAGE. THE VEHICLE WAS TAKEN TO THE DEALER. THE TECHNICIAN DIAGNOSED THAT THE DRIVER AND PASSENGER SIDE SPEED SENSORS AND THE ELECTRONIC BRAKE CONTROL MODULE WERE DEFECTIVE. THE MANUFACT…
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TL* THE CONTACT OWNS A 2001 CHEVROLET SILVERADO 1500. WHILE DRIVING VARIOUS SPEEDS, THE ABS WARNING LIGHT ILLUMINATED AND THE BRAKES FAILED TO ENGAGE. THE VEHICLE WAS TAKEN TO THE DEALER. THE TECHNICIAN DIAGNOSED THAT THE DRIVER AND PASSENGER SIDE SPEED SENSORS AND THE ELECTRONIC BRAKE CONTROL MODULE WERE DEFECTIVE. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 120,000.
TL*THE CONTACT OWNS A 2001 CHEVROLET SILVERADO. WHENEVER THE CONTACT DROVE THE VEHICLE HE NOTICED THAT IT TOOK MORE THAN THE NORMAL PRESSURE IN ORDER TO DEPRESS THE ACCELERATOR PEDAL. THE VEHICLE WAS TAKEN TO THE DEALER WHO STATED THAT THE THROTTLE BODY NEEDED TO BE REPLACED. THE CONTACT HAS NOTICED THE FAILURE SINCE THE VEHICLE…
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TL*THE CONTACT OWNS A 2001 CHEVROLET SILVERADO. WHENEVER THE CONTACT DROVE THE VEHICLE HE NOTICED THAT IT TOOK MORE THAN THE NORMAL PRESSURE IN ORDER TO DEPRESS THE ACCELERATOR PEDAL. THE VEHICLE WAS TAKEN TO THE DEALER WHO STATED THAT THE THROTTLE BODY NEEDED TO BE REPLACED. THE CONTACT HAS NOTICED THE FAILURE SINCE THE VEHICLE WAS PURCHASED. THE CURRENT AND FAILURE MILEAGES WERE 110450.
I WAS IN A CAR ACCIDENT. WHILE DRIVING, I DON'T KNOW WHAT HAPPENED BUT SOMETHING CAUSED MY TRUCK TO ROLL OVER. EARLIER THAT DAY I REMEMBER THAT MY PARKING BRAKE WOULD NOT WORK. I ALSO HAD SOME TROUBLE PUTTING THE GEAR INTO PARK. MY AIRBAGS DIDN'T DEPLOY DURING THIS ACCIDENT, AND I WAS DRIVING WITH CRUISE CONTROL ON IF THAT HAS A…
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I WAS IN A CAR ACCIDENT. WHILE DRIVING, I DON'T KNOW WHAT HAPPENED BUT SOMETHING CAUSED MY TRUCK TO ROLL OVER. EARLIER THAT DAY I REMEMBER THAT MY PARKING BRAKE WOULD NOT WORK. I ALSO HAD SOME TROUBLE PUTTING THE GEAR INTO PARK. MY AIRBAGS DIDN'T DEPLOY DURING THIS ACCIDENT, AND I WAS DRIVING WITH CRUISE CONTROL ON IF THAT HAS ANY BEARING ON THIS. ALSO, MY FRONT TIRES WERE ALWAYS NEEDING AIR. *TR
TL*THE CONTACT OWNS A 2001 CHEVROLET SILVERADO 1500. WHILE DRIVING 5 MPH THROUGH A PARKING LOT, THE CONTACT APPLIED THE BRAKES AND THE VEHICLE CONTINUED FORWARD. THE BRAKES EVENTUALLY BEGAN TO FUNCTION. HE WAS ABLE TO DRIVE THE VEHICLE TO A MECHANIC AND THE FAILURE WAS DIAGNOSED AS THE VEHICLE SPEED CONTROL SENSOR. HE WILL H…
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TL*THE CONTACT OWNS A 2001 CHEVROLET SILVERADO 1500. WHILE DRIVING 5 MPH THROUGH A PARKING LOT, THE CONTACT APPLIED THE BRAKES AND THE VEHICLE CONTINUED FORWARD. THE BRAKES EVENTUALLY BEGAN TO FUNCTION. HE WAS ABLE TO DRIVE THE VEHICLE TO A MECHANIC AND THE FAILURE WAS DIAGNOSED AS THE VEHICLE SPEED CONTROL SENSOR. HE WILL HAVE THE VEHICLE SPEED CONTROL SENSOR REPLACED. IN OCTOBER 2002, THE SPEED CONTROL SENSORS WERE CLEANED FOR CORROSION, BUT NOT REPLACED UNDER NHTSA CAMPAIGN ID NUMBER 05V379000 (SERVICE BRAKES, HYDRAULIC: ANTILOCK). THE PURCHASE DATE WAS UNKNOWN. THE CURRENT MILEAGE WAS 67,800 AND FAILURE MILEAGE WAS 67,500. * UPDATED 12/12/07 *BF UPDATED 12/12/07 *TR
WHILE DRIVING MY 2001 CHEVROLET SILVERADO I AM REQUIRED TO USE MORE THAN THE USUAL AMOUNT OF FORCE TO DEPRESS THE ACCELERATOR, AND WHEN I DO THE VEHICLE LUNGES FORWARD. MY ACCELERATOR PEDAL WOUND UP "LIMP" ON THE FLOOR OF THE VEHICLE THIS WEEKEND WHEN PUSHING DOWN ON THE PEDAL LEAVING THE VEHICLE UNABLE TO ACCELERATE WHILE DRIV…
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WHILE DRIVING MY 2001 CHEVROLET SILVERADO I AM REQUIRED TO USE MORE THAN THE USUAL AMOUNT OF FORCE TO DEPRESS THE ACCELERATOR, AND WHEN I DO THE VEHICLE LUNGES FORWARD. MY ACCELERATOR PEDAL WOUND UP "LIMP" ON THE FLOOR OF THE VEHICLE THIS WEEKEND WHEN PUSHING DOWN ON THE PEDAL LEAVING THE VEHICLE UNABLE TO ACCELERATE WHILE DRIVING IN TRAFFIC. THE VEHICLE WOUND UP BEING TOWED FOR REPAIR. *TR
THE STALK FOR THE COMBINATION TURN SIGNAL, WINDSHIELD WIPER, CRUISE CONTROL, BROKE RESULTED IN UNRELIABLE OPERATION OF THE WINDSHIELD WIPERS AND UNRELIABLE TURN SINGAL OPERATION. IN THE CASE OF THE 2001 SILVERADO THE WINDSHIELD WIPERS ACTIVATED WHEN THE TURN SIGNALWAS SELECTED. SINCE THIS SAME CONTROL WAS USED FOR SEVERAL CR…
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THE STALK FOR THE COMBINATION TURN SIGNAL, WINDSHIELD WIPER, CRUISE CONTROL, BROKE RESULTED IN UNRELIABLE OPERATION OF THE WINDSHIELD WIPERS AND UNRELIABLE TURN SINGAL OPERATION. IN THE CASE OF THE 2001 SILVERADO THE WINDSHIELD WIPERS ACTIVATED WHEN THE TURN SIGNALWAS SELECTED. SINCE THIS SAME CONTROL WAS USED FOR SEVERAL CRITICAL FUNCTIONS, INCLUDING TURN SIGNALS, WIPERS, AND CRUISE CONTROL ACTIVATION AND DEACTIVATION, I EXPECT CERTAIN FAILURE MODES COULD PRESENT A SERIOUS SAFETY ISSUE. RESEARCHING THIS ISSUE, IT SEEMS TO BE A COMMON PROBLEM ON THIS MODEL SILVERADO AND OTHER GM VEHICLES THAT USE THE SAME COMBINATION CONTROL.*AK
THE GAS PEDAL ACCELERATED WITHOUT WARNING .DRIVER WAS ABLE TO CONTROL THE VEHICLE, AND PULLED OVER, AND TURNED OFF THE VEHICLE. DRIVER WAS ABLE TO RESTART VEHICLE TEN MINUTES LATER, AND TOOK THE VEHICLE TO THE DEALER. MECHANIC STATED PROBLEM CCOULD NOT DUPLICATED. *AK
THROTTLE WAS STICKING. WHEN LETTING FOOT OFF GAS PEDAL VEHICLE CONTINUES TO ACCELERATE. TOOK VEHICLE TO DEALER, AND DEALER STATED IT WAS A KNOWN PROBLEM AND SPRAYED WITH CARBORATER CLEANER. PLEASE PROVIDE ANY FURTHER INFORMATION.*AK
Official recalls
0No recalls in this snapshot.
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
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.