NHTSA owner reports · September 18, 2026 snapshot.
Electrical System complaints
63 reportsClear category filter52,000 miles · Jan 17, 2016
Electrical SystemEnginePower Train
WHILE DRIVING AT 40MPH ON A STRAIGHT ROAD, I WENT TO CHANGE THE DRIVE MODE, BUT I ACCIDENTALLY HIT THE POWER BUTTON. WHEN I HIT THE POWER BOTTOM THE CAR SHUT DOWN. I WAS NOT ABLE TO RESTART THE CAR WHILE THE SHIFT LEVER WAS IN DRIVE, SO I HAD TO COAST TO A STOP, PLACE THE VEHICLE IN PARK, AND REBOOT THE CAR. I WAS VERY SURPRISE…
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WHILE DRIVING AT 40MPH ON A STRAIGHT ROAD, I WENT TO CHANGE THE DRIVE MODE, BUT I ACCIDENTALLY HIT THE POWER BUTTON. WHEN I HIT THE POWER BOTTOM THE CAR SHUT DOWN. I WAS NOT ABLE TO RESTART THE CAR WHILE THE SHIFT LEVER WAS IN DRIVE, SO I HAD TO COAST TO A STOP, PLACE THE VEHICLE IN PARK, AND REBOOT THE CAR. I WAS VERY SURPRISED THAT I WAS ABLE TO POWER OFF THE CAR WHILE I WAS DRIVING AROUND 40-45 MPH.
NHTSA ODI #10820733
36,000 miles · Jan 4, 2016
Electrical System
TL* THE CONTACT OWNS A 2013 CHEVROLET VOLT. THE CONTACT STATED THAT WHILE DRIVING AT APPROXIMATELY 25 MPH, THE SERVICE HIGH VOLTAGE CHARGING SYSTEM WARNING LIGHT DISPLAYED. THE VEHICLE WAS TAKEN TO A DEALER WHERE THE CONTACT WAS INFORMED THAT THE BATTERY COOLANT LEVEL WAS LOW. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOTIF…
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TL* THE CONTACT OWNS A 2013 CHEVROLET VOLT. THE CONTACT STATED THAT WHILE DRIVING AT APPROXIMATELY 25 MPH, THE SERVICE HIGH VOLTAGE CHARGING SYSTEM WARNING LIGHT DISPLAYED. THE VEHICLE WAS TAKEN TO A DEALER WHERE THE CONTACT WAS INFORMED THAT THE BATTERY COOLANT LEVEL WAS LOW. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 36,000.
NHTSA ODI #10817590
6,600 miles · Oct 14, 2014
Electrical SystemEngineFuel/propulsion System
I RECEIVED THE FOLLOWING MESSAGE ON THE CAR DASH DISPLAY: PROPULSION REDUCED-ENGINE NOT AVAILABLE. THIS MESSAGE CAME ON WHILE I WAS DRIVING IN THE CARPOOL LANE. I CALLED GM THRU ON STAR AND WAS TOLD THAT I HAD A CATASTROPHIC ERROR AND NEEDED TO GET MY CAR INTO REPAIR WITH 24 HOURS. WITH ONLY 6 MILES LEFT ON THE BATTERY, I TO…
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I RECEIVED THE FOLLOWING MESSAGE ON THE CAR DASH DISPLAY: PROPULSION REDUCED-ENGINE NOT AVAILABLE. THIS MESSAGE CAME ON WHILE I WAS DRIVING IN THE CARPOOL LANE. I CALLED GM THRU ON STAR AND WAS TOLD THAT I HAD A CATASTROPHIC ERROR AND NEEDED TO GET MY CAR INTO REPAIR WITH 24 HOURS. WITH ONLY 6 MILES LEFT ON THE BATTERY, I TOLD THE GM REP THAT I BETTER GET THE CAR TO A CHEVY DEALER. I IMMEDIATELY DROVE TO THE DEALERSHIP IN CULVER CITY. THE MINUTE I PULLED INTO THE DRIVEWAY OF THE DEALERSHIP, MY CAR STOPPED AND WOULD NOT RESTART. THIS COULD HAVE BEEN A DISASTER IF THE CAR HAD STOPPED IN THE CARPOOL LANE. I HAVE READ OF OTHER COMPLAINTS ON GOOGLE AND YAHOO. I WAS TOLD BY THE DEALERSHIP THAT THEY WERE GOING TO REPLACE THE ENGINE MODULE, WHICH THEY SAID WOULD TAKE 8 HOURS TO REPAIR, BUT WHEN I PICKED UP THE CAR, THEY ONLY REPLACED THE TRANSMISSION MODULE. SINCE THE INCIDENT, I ONLY GET A FULL CHARGE OF 32 TO 34 MILES, WHERE BEFORE THE INCIDENT I WAS GETTING A FULL CHARGE OF 42 TO 44 MILES PER CHARGE. THIS IS DEFINITE SAFETY ISSUE AS GM BLAMES THE DRIVER FOR THE PROBLEM. GM NEEDS TO REPLACE THE ENGINE MODULE ON MY CAR. *TR
NHTSA ODI #10644626
21,000 miles · Sep 16, 2014
Air BagsElectrical SystemPower Train
WAS ENTERING HIGHWAY IN THE DARK AND WENT TO PUT THE CAR INTO "HOLD" MODE TO RUN THE GAS ENGINE AND SAVE BATTERY CHARGE. THIS REQUIRES PUSHING A BUTTON 3 TIMES. I REACHED OVER AND PUSHED THE BUTTON. ACCIDENTLY WAS PUSHING THE "POWER" BUTTON WHICH IS RIGHT BELOW THE "MODE" BUTTON SHUTTING DOWN THE CAR. THE ENTIRE CAR SHUTS OFF, N…
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WAS ENTERING HIGHWAY IN THE DARK AND WENT TO PUT THE CAR INTO "HOLD" MODE TO RUN THE GAS ENGINE AND SAVE BATTERY CHARGE. THIS REQUIRES PUSHING A BUTTON 3 TIMES. I REACHED OVER AND PUSHED THE BUTTON. ACCIDENTLY WAS PUSHING THE "POWER" BUTTON WHICH IS RIGHT BELOW THE "MODE" BUTTON SHUTTING DOWN THE CAR. THE ENTIRE CAR SHUTS OFF, NO LIGHTS, POWERTRAIN, PS, PB JUST DEAD. THIS IS EASY TO DO IF YOU ARE WATCHING THE ROAD AND JUST GLANCE DOWN TO THE BUTTONS. THEY ARE PLACED TOO CLOSE TOGETHER AND THIS IS GOING TO BE A SERIOUS PROBLEM IF IN TRAFFIC OR ON WINDING ROADS. NUMEROUS REPORTS OF THIS ON THE VOLT FORUM! *TR
NHTSA ODI #10633680
14,238 miles · Aug 6, 2014
Electrical System
CHEVY VOLT IS AN EXTENDED RANGE ELECTRIC VEHICLE, IT USES A GAS POWERED GENERATOR TO PROVIDE ELECTRIC POWER FOR DRIVING IF THE BATTERY HAS DROPPED BELOW A CERTAIN VOLTAGE. I PARKED MY VEHICLE IN MY GARAGE AT HOME AND NEGLECTED TO POWER DOWN THE ELECTRIC SYSTEMS IN THE VEHICLE. THERE IS A BLUE POWER BUTTON ON THE CENTER CONSOLE, …
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CHEVY VOLT IS AN EXTENDED RANGE ELECTRIC VEHICLE, IT USES A GAS POWERED GENERATOR TO PROVIDE ELECTRIC POWER FOR DRIVING IF THE BATTERY HAS DROPPED BELOW A CERTAIN VOLTAGE. I PARKED MY VEHICLE IN MY GARAGE AT HOME AND NEGLECTED TO POWER DOWN THE ELECTRIC SYSTEMS IN THE VEHICLE. THERE IS A BLUE POWER BUTTON ON THE CENTER CONSOLE, IF YOU DO NOT PRESS THIS BUTTON VERY DELIBERATELY THE SYSTEM DOES NOT POWER DOWN. THIS IS NOT READILY APPARENT SINCE THE CENTER CONSOLE STAYS LIT EVEN WHEN POWERED DOWN. I OPENED THE CHARGE PORT AND PLUGGED THE VEHICLE IN. IF THE VEHICLE IS POWERED DOWN THE CAR WILL GIVE AN AUDIBLE BEEP AND THE CHARGE LIGHT WILL GO FROM ORANGE TO GREEN AFTER A PERIOD OF ABOUT 4-5 SECONDS. IF THE VEHICLE IS NOT POWERED DOWN THE LIGHT STAYS ORANGE AND NO WARNING IS GIVEN TO THE OPERATOR. I LEFT THE VEHICLE, I HAD THE REMOTE WITH ME. THE FOLLOWING MORNING MY WIFE DISCOVERED THE CAR IN THE GARAGE WITH THE GENERATOR RUNNING AT VERY HIGH RPM'S THE TEMPERATURE IN THE GARAGE WAS VERY HOT, THE DOOR HANDLE TO THE GARAGE WAS HOT TO THE TOUCH. THE CAR USED ALMOST ALL OF IT'S GASOLINE SUPPLY, ABOUT 10 GALLONS, THAT EQUATES TO ABOUT 190 POUNDS OF CO2 PRODUCED IN MY HOME. I BACKED THE CAR OUT OF THE GARAGE, THE CONCRETE UNDERNEATH THE CAR WAS TOO HOT TO TOUCH AND STILL WARM 10 HOURS LATER. THE CAR WAS TOWED TO MY LOCAL CHEVROLET DEALER, THEY REPAIRED THE HEAT DAMAGE AND RETURNED THE CAR TO ME. I HAVE SINCE TESTED THIS SAME SCENARIO AND THE VEHICLE WILL START ITS GAS POWERED GENERATOR IF LEFT POWERED ON. NO GAS MOTOR IS RUNNING WHEN VEHICLE IS PARKED, IT IS OPERATING ON ITS BATTERY SYSTEM. ONCE THE BATTERY IS DEPLETED IT WILL SELF START ITS GENERATOR EVEN IF: 1 THE CAR IS IN PARK 2 THE CHARGE DOOR IS OPEN 3 THE CAR IS PLUGGED IN TO IT'S CHARGER 4 THERE IS NO DRIVER IN THE DRIVERS SEAT 5 THE VEHICLE IS NOT MOVING 6 THE REMOTE NOT IN THE VEHICLE. FAILURE TO WARN VEHICLE IS ON. *TR
NHTSA ODI #10619228
1,000 miles · Aug 4, 2014
Electrical SystemEngineService Brakes
THE CAR'S ELECTRICAL / SOFTWARE ISSUES CAUSED (1) ALL OF THE WINDOWS TO ROLL DOWN IN UNISON (IN FOR REPAIR 3 TIMES TO FIX THIS ONE), (2) CAUSED THE CAR TO NOT RECOGNIZE THAT IT WAS IN "PARK", THUS NOT SHUTTING OFF, AND (3) CAUSED THE CAR TO LOSE POWER WITHOUT TOUCHING ANY OF THE BUTTONS ON THE CONSOLE (I.E. THE "DRIVE" BUTTON OR…
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THE CAR'S ELECTRICAL / SOFTWARE ISSUES CAUSED (1) ALL OF THE WINDOWS TO ROLL DOWN IN UNISON (IN FOR REPAIR 3 TIMES TO FIX THIS ONE), (2) CAUSED THE CAR TO NOT RECOGNIZE THAT IT WAS IN "PARK", THUS NOT SHUTTING OFF, AND (3) CAUSED THE CAR TO LOSE POWER WITHOUT TOUCHING ANY OF THE BUTTONS ON THE CONSOLE (I.E. THE "DRIVE" BUTTON OR THE "POWER" BUTTON). THE LATEST INCIDENT OCCURRED LAST FRIDAY (AUGUST 1, 2014) WHEN THE CAR JUST LOST POWER WHILE I WAS DRIVING AT 65 MPH ON I-85 NORTH AT AROUND 4:00PM. I HAD TO GET OVER FROM 4 LANES OF TRAFFIC WITH NO POWER AT ALL IN THE CAR AND LUCKILY DID SO WITHOUT INCIDENT. ONSTAR'S DIAGNOSTICS SHOWED THAT THE ELECTRICAL SYSTEM, BRAKING SYSTEM, ENGINE, AND OTHER PARTS OF THE CAR SHOWED THE CAR NEEDED IMMEDIATE ATTENTION. I PUT THE CAR IN PARK AND WHILE STILL WITH ONSTAR THE DASHBOARD LIT UP AND THE POWER BUTTON LIT UP TOO. I HIT THE POWER BUTTON AND DROVE STRAIGHT TO THE RICK HENDRICK CHEVY DEALERSHIP IN DULUTH. WHEN I WENT TO PICK THE CAR UP LATER SATURDAY MORNING, I WAS TOLD THAT THERE'S NOTHING THEY CAR DO BECAUSE THEY CAN'T RECREATE THE PROBLEM. THEY HAVE REFLASHED VARIOUS ECUS, BUT AT THE END OF THE DAY CANNOT "RECREATE" THE PROBLEMS AND CANNOT FIX THEM. SO THEY JUST WIPE THEIR HANDS CLEAN OF THESE ISSUES AND ACT LIKE THEY DON'T EXIST. (THE SERVICE MANAGER ACTUALLY CALLED ME "IGNORANT" ONCE AND LATER APOLOGIZED.) I PRAY IT DOESN'T TAKE PEOPLE DYING IN THESE CARS BEFORE CHEVROLET AND/OR GENERAL MOTORS DOES SOMETHING TO FIX THEM. *TR
NHTSA ODI #10618578
6,500 miles · Jul 30, 2014
Electrical SystemEngineParking Brake
TL* THE CONTACT OWNS A 2013 CHEVROLET VOLT. WHILE PULLING OUT THE DRIVEWAY AT 10 MPH, THE PARKING BRAKE AUTOMATICALLY APPLIED AND THE VEHICLE STALLED. THE CHECK ENGINE INDICATOR ILLUMINATED. THE DEALER STATED THAT WATER LEAKED INTO THE BATTERY CHARGING RECEPTACLE CAUSING THE RESISTANCE OF THE INTERLOCK TO DROP OVER A PERIOD OF …
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TL* THE CONTACT OWNS A 2013 CHEVROLET VOLT. WHILE PULLING OUT THE DRIVEWAY AT 10 MPH, THE PARKING BRAKE AUTOMATICALLY APPLIED AND THE VEHICLE STALLED. THE CHECK ENGINE INDICATOR ILLUMINATED. THE DEALER STATED THAT WATER LEAKED INTO THE BATTERY CHARGING RECEPTACLE CAUSING THE RESISTANCE OF THE INTERLOCK TO DROP OVER A PERIOD OF TIME, WHICH CONTRIBUTED TO THE PARKING BRAKE BECOMING ENGAGED. THE VEHICLE WAS REPAIRED AND THE MANUFACTURER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS 6,500. UPDATED 12/2/14*CN THE CONSUMER STATED THE INCIDENT CAUSED THE TRANSMISSION TO GO INTO PARK.
NHTSA ODI #10617670
800 miles · May 25, 2014
Electrical SystemElectronic Stability Control (esc)Power Train
WHEN IN LOW GEAR (HIGHER REGENERATIVE BRAKING), WHEN BRAKING AND GOING OVER SOME BUMPS, THE REGEN BRAKING STOPS CAUSING A FEELING OF A LURCH FORWARD. A 'LOW TRACTION" LIGHT APPEARS. THIS CAUSES A REDUCTION IN BRAKING FORCE OF APPROXIMATELY 35BHP, A VERY UNSAFE CONDITION. AN ANTI-LOCK BRAKE STYLE PULSATION OF THE REGEN SHOULD …
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WHEN IN LOW GEAR (HIGHER REGENERATIVE BRAKING), WHEN BRAKING AND GOING OVER SOME BUMPS, THE REGEN BRAKING STOPS CAUSING A FEELING OF A LURCH FORWARD. A 'LOW TRACTION" LIGHT APPEARS. THIS CAUSES A REDUCTION IN BRAKING FORCE OF APPROXIMATELY 35BHP, A VERY UNSAFE CONDITION. AN ANTI-LOCK BRAKE STYLE PULSATION OF THE REGEN SHOULD BE EMPLOYED, NOT A DISCONTINUATION OF THE REGEN BRAKES. *TR
NHTSA ODI #10593935
11,669 miles · May 8, 2014
Electrical SystemEngineFuel/propulsion System
THE VEHICLE HAS REPEATEDLY SHUT DOWN WHILE DRIVING/FAILED TO START SINCE JUNE 2013. THE VEHICLE HAS BEEN IN SERVICE DUE TO REPAIRS = 42 DAYS IN THE LAST 10 MONTHS. GM CONTINUES TO REPLACE/RECALL PARTS ON THE HYBRID BATTERY AS WELL AS OTHER PARTS CONCERNING SECONDARY PROBLEMS. I AM AFRAID THIS VEHICLE WILL SHUT DOWN AGAIN WHIL…
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THE VEHICLE HAS REPEATEDLY SHUT DOWN WHILE DRIVING/FAILED TO START SINCE JUNE 2013. THE VEHICLE HAS BEEN IN SERVICE DUE TO REPAIRS = 42 DAYS IN THE LAST 10 MONTHS. GM CONTINUES TO REPLACE/RECALL PARTS ON THE HYBRID BATTERY AS WELL AS OTHER PARTS CONCERNING SECONDARY PROBLEMS. I AM AFRAID THIS VEHICLE WILL SHUT DOWN AGAIN WHILE I AM DRIVING CAUSING AN ACCIDENT HURTING ME OR OTHERS ON THE ROAD. CLEARLY, IT IS A POTENTIAL DEATH TRAP. *TR
NHTSA ODI #10587172
Mileage unknown · Apr 28, 2014
Electrical SystemEquipmentVisibility
LETTER FROM CONSTITUENT REGARDING HIS WIFE 2013 CHEVROLET VOLT, WHO HAVING ISSUES WITH THE HVAC SYSTEM NOT COOLING THE REAR SEATS WHEN THE TEMPERATURE WAS NEAR 100 DEGREES; REQUESTING THAT GM ACCEPT THE RETURN OF THE VEHICLE AND PURCHASE PRICE BE REFUNDED.*SD THE CONSUMER STATED THE WINDOWS WOULD FOG UP WHENEVER HUMIDITY WAS PR…
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LETTER FROM CONSTITUENT REGARDING HIS WIFE 2013 CHEVROLET VOLT, WHO HAVING ISSUES WITH THE HVAC SYSTEM NOT COOLING THE REAR SEATS WHEN THE TEMPERATURE WAS NEAR 100 DEGREES; REQUESTING THAT GM ACCEPT THE RETURN OF THE VEHICLE AND PURCHASE PRICE BE REFUNDED.*SD THE CONSUMER STATED THE WINDOWS WOULD FOG UP WHENEVER HUMIDITY WAS PRESENT, THE NAVIGATION SYSTEM, WAS READING THE VEHICLE WAS IN DETROIT, THE RE-GENERATIVE BRAKING SYSTEM AND ACCELERATION HAD DOWNGRADED AFTER THE LAST SOFTWARE UPDATE.*JB
NHTSA ODI #10584881
Official recalls
3Jul 27, 2023
General Motors, LLC (GM) is recalling certain 2013 Buick Verano, Chevrolet Camero, Sonic, and Volt vehicles. The driver-side air bag inflator may explode during deployment due to a manufacturing defect.
Consequence & remedy
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants, resulting in serious injury or death.
Remedy: Dealers will replace the driver-side air bag module, free of charge. On some 2013 Volt vehicles, the steering wheel will be replaced as well, free of charge. Owner notification letters were mailed October 23, 2023. Owners may contact Buick customer service at 1-800-521-7300 and Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N232413120.
Jun 14, 2018
General Motors LLC (GM) is recalling certain 2013 Chevrolet Volt vehicles. An update to the Hybrid Powertrain Control Module 2 (HPCM2) may have disabled the cell balancing function causing a low-voltage condition.
Consequence & remedy
Consequence: If the voltage drops, the vehicle may lose propulsion, increasing the risk of crash.
Remedy: GM will notify owners, and dealers will reprogram the HPCM2, free of charge. The recall began July 24, 2018. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is 18215.
Mar 13, 2015
General Motors LLC (GM) is recalling certain model year 2011-2013 Volt vehicles manufactured August 25, 2010, to June 26, 2013. If the driver exits the vehicle without turning off the electrical system, the battery may drain low enough that the gasoline engine will automatically start itself to recharge the electric battery.
Consequence & remedy
Consequence: If the engine runs for an extended period of time in an enclosed space, there may be a build up of carbon monoxide, increasing the risk of personal injury.
Remedy: GM will notify owners, and dealers will update the engine management software to limit the time that the stationary vehicle can be left in the ON position, free of charge. The recall began April 15, 2015. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is 14617.
Additional source detail variants (2)
Electrical System:ignition
General Motors LLC (GM) is recalling certain model year 2011-2013 Volt vehicles manufactured August 25, 2010, to June 26, 2013. If the driver exits the vehicle without turning off the electrical system, the battery may drain low enough that the gasoline engine will automatically start itself to recharge the electric battery.
Consequence: If the engine runs for an extended period of time in an enclosed space, there may be a build up of carbon monoxide, increasing the risk of personal injury.
Remedy: GM will notify owners, and dealers will update the engine management software to limit the time that the stationary vehicle can be left in the ON position, free of charge. The recall began April 15, 2015. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is 14617.
Engine And Engine Cooling:engine:gasoline
General Motors LLC (GM) is recalling certain model year 2011-2013 Volt vehicles manufactured August 25, 2010, to June 26, 2013. If the driver exits the vehicle without turning off the electrical system, the battery may drain low enough that the gasoline engine will automatically start itself to recharge the electric battery.
Consequence: If the engine runs for an extended period of time in an enclosed space, there may be a build up of carbon monoxide, increasing the risk of personal injury.
Remedy: GM will notify owners, and dealers will update the engine management software to limit the time that the stationary vehicle can be left in the ON position, free of charge. The recall began April 15, 2015. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is 14617.
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
2DP22005 · Pedestrian Alert Sounds
Opened Jan 27, 2023 · Closed Aug 7, 2023
Status: closed (inferred from source dates) · Electrical System:propulsion System
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight rating of 4,536 KG or less or are defined as low-speed vehicles. The standard became fully applicable to all such vehicles manufactured on or after March 1, 2021.On January 27, 2023, NHTSA opened Defect Petition (DP) 22-005 to evaluate the subject matter described in the petition. On June 24, 2023 and as supplemented on June 25, 2023, the petitioner notified NHTSA he was withdrawing his petition. The petitioner indicated that, based on his review of data, there is no justification for asserting potential benefits that could be derived from actions sought by my petition. Based on the petitioner's withdrawal, DP22-005 is closed. Closure of this DP does not represent a determination by NHTSA regarding the subject matter of the petition.
PE19013 · Passenger Sensing System
Opened Sep 17, 2019 · Closed Jul 2, 2021
Status: closed (inferred from source dates) · Air Bags:sensor:occupant Classification:front Passenger
In September 2019, the Office of Defects Investigation (ODI) opened PE19-013 to assess the potential safety related effects of a malfunction of the Passenger Sensing System (PSS) in 2012-2013 Model Year (MY) Chevrolet Volt vehicles. Consumers reported that due to a malfunction of the PSS, the air bag system malfunction indicator light (MIL) was activated. Many of the complaints noted the malfunction occurred after the warranty period expired and mentioned high repair costs as a major deterrent to the repair of the vehicle.The PSS sensor mat is embedded in the front passenger seat cushion and is intended to detect child seats and small statured occupants who could be harmed by deployment of the frontal passenger air bag. The PSS may develop a malfunction due to bunching of the sensor mat in the seat trench. The bunching of the sensor mat could cause the mat to repeatedly fold in the same location. Over time, the repeated folding can cause an increased resistance in the sensor mat. An increased resistance in the PSS sensor mat is detected as a fault in the air bag system diagnostic. If this fault is detected, a diagnostic trouble code will be stored in the air bag control unit and the air bag MIL will illuminate.Further, if the fault is detected, the passenger frontal and knee air bags will be suppressed in a crash of sufficient severity to warrant a commanded deployment regardless of the nature of size of the occupant of the front passenger seat.The report counts shown above include only those reports that specifically address the issue covered by this investigation, failure of the PSS sensor mat. Reports alleging only that the air bag light is on with no cause stated, or where a different cause was otherwise identified, were excluded as the air bag light could be illuminated for system faults other than a PSS malfunction.The subject vehicles have been in service for approximately ten (10) years. An analysis of General Motors (GM) warranty data for the subject vehicles, including a comparison with other agency and manufacturer data pertaining to similar occupant detection system failure investigations, indicates the subject vehicles experience a comparatively low complaint rate for this issue given the number of years the vehicles have been in service.GM has instituted a cost reduction program for the repair/replacement of the PSS in the subject vehicles. Based on this cost reduction program as well as:1) a comparatively low warranty rate; 2) no reported injuries, deaths or asymmetric deployments; and 3) the age of the vehicles; ODI is closing this Preliminary Evaluation. The closing of this investigation does not constitute a finding by NHTSA that a safety related defect does not exist. The agency reserves the right to take additional action if warranted by new circumstances.The ODI complaints cited above can be viewed at www.nhtsa.gov under the following ODI identification numbers in a separate attachment.