2011 GMC Sierra 1500
Problems, recalls and owner-reported issues
Air bags is the leading concern among 366 owner complaints filed for this model year. This is the 9th highest complaint count among 26 Sierra 1500 model years with reports.
Of the 2011 reports, 6 involved a crash and 3 involved a fire. 12 people were injured.
What owners report most often
Recalls and investigations
Air bags, frontal, passenger side, inflator moduleFeb 5, 2021
General Motors, LLC (GM) is recalling certain 2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of AL, CA, FL, GA, HI, LA, MS, SC, TX, PR, AS, GU, the MP, and VI or "Zone A." Additionally GM is recalling certain 2011-2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, Yukon XL and 2011-2013 Cadillac Escalade EXT, Chevrolet Avalanche, Silverado 1500, and GMC Sierra 1500 vehicles originally sold, or ever registered, in the states of AZ, AR, DE, DC, IL, IN, KS, KY, MD, MO, NE, NV, NJ, NM, NC, OH, OK, PA, TN, VA, and WV or "Zone B." Additionally, GM is recalling certain 2010-2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, and Yukon XL and 2010-2013 Cadillac Escalade EXT, Chevrolet Avalanche, Silverado 1500, and GMC Sierra 1500 vehicles originally sold, or ever registered, in the states of AK, CO, CT, ID, IA, ME, MA, MI, MN, MT, NH, NY, ND, OR, RI, SD, UT, VT, WA, WI, and WY or "Zone C." These vehicles are equipped with non-desiccated passenger frontal inflators containing phase-stabilized ammonium nitrate (PSAN) propellant. These inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, high temperatures, and high temperature cycling.
An inflator explosion may result in sharp metal fragments striking the driver or other occupants, resulting in serious injury or death.
GM will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. Interim letters notifying owners of the safety risk were mailed on February 25, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed to 40 VIN owners on May 11, 2021. A second owner notification letter was mailed to all other owners on January 24, 2022. Owners may contact Chevrolet customer service at 1-800-222-1020; Cadillac customer service at 1-800-458-8006; and GMC customer service at 1-800-462-8782. GM's number for this recall is N212328800.
Campaign 21V054000 on NHTSA.gov
Air bags, frontal, passenger side, inflator moduleFeb 5, 2021
General Motors, LLC (GM) is recalling certain 2007-2011 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, Yukon XL, and 2009-2011 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500 and Sierra 3500 vehicles originally sold, or ever registered, in the states of Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands or "Zone A." Additionally, GM is recalling certain 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, Yukon XL vehicles originally sold, or ever registered, in the states of Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia or "Zone B." These vehicles are equipped with non-desiccated passenger frontal inflators containing phase-stabilized ammonium nitrate (PSAN) propellant. These inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, high temperatures, and high temperature cycling.
An inflator explosion may result in sharp metal fragments striking the driver or other occupants, resulting in serious injury or death.
GM will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. Interim letters notifying owners of the safety risk were mailed on February 22, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed on March 1, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020; Cadillac customer service at 1-800-458-8006; and GMC customer service at 1-800-462-8782. GM's number for this recall is N212328760.
Campaign 21V050000 on NHTSA.gov
EquipmentApr 26, 2018
General Motors LLC (GM) is recalling certain 2009-2014 Chevrolet Silverado HD and GMC Sierra HD, 2009 GMC Topkick 5000, 6000, 7000 and 8000 Series and Isuzu F Series, and 2009-2018 Chevrolet Express, and GMC Savana vehicles, equipped with certain Plastic-Handle Fire Extinguishers or Push Button 'Pindicator' Fire Extinguishers. These extinguishers may become clogged, preventing the extinguisher from discharging as expected or requiring excessive force to activate the extinguisher. Additionally, in certain models, the nozzle may detach from the valve assembly with enough force that it could cause injury and also render the product inoperable. For a full list of the affected fire extinguisher models visit: https://static.nhtsa.gov/odi/rcl/2017/RMISC-17E062-5427.pdf
In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury.
GM will notify owners, instructing them to contact Kidde to get a replacement fire extinguisher, free of charge. The recall began June 11, 2018. Owners may contact Chevrolet customer service at 1-800-222-1020, GMC customer service at 1-800-462-8782, and Isuzu customer service at 1-866-441-9638. GM's number for this recall is 18146.
Campaign 18V267000 on NHTSA.gov
Suspension, rear, axle, spindleJan 6, 2011
GENERAL MOTORS IS RECALLING CERTAIN MODEL YEAR 2011 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT; CHEVROLET AVALANCHE, COLORADO, EXPRESS, SILVERADO, SUBURBAN, TAHOE; AND GMC CANYON, SIERRA, SAVANA, YUKON AND YUKON XL VEHICLES. THE REAR AXLE CROSS PINS WERE NOT PROPERLY HEAT TREATED AND COULD FRACTURE AND BECOME DISPLACED WITHIN THE REAR AXLE. SHOULD THE PIN SHIFT OUT OF POSITION, IT COULD CREATE AN INTERFERENCE CONDITION AND CAUSE THE REAR AXLE TO LOCK.
THE DRIVER MAY NOT BE ABLE TO MAINTAIN DIRECTIONAL CONTROL OF THE VEHICLE AND A CRASH COULD OCCUR WITHOUT WARNING.
DEALERS WILL INSTALL A NEW REAR AXLE CROSS PIN FREE OF CHARGE. THE SAFETY RECALL BEGAN ON JANUARY 11, 2011. OWNERS MAY CONTACT CADILLAC AT 1-866-982-2339, CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463 AND AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
Campaign 11V007000 on NHTSA.gov
Suspension, rear, axle, spindleDec 17, 2010
GENERAL MOTORS IS RECALLING CERTAIN MODEL YEAR 2011 CADILLAC ESCALADE EXT, CHEVROLET AVALANCHE, SILVERADO LD AND GMC SIERRA LD VEHICLES. THE REAR AXLE CROSS PINS WERE NOT PROPERLY HEAT TREATED AND COULD FRACTURE AND BECOME DISPLACED WITHIN THE REAR AXLE. SHOULD THE PIN SHIFT OUT OF POSITION, IT COULD CREATE AN INTERFERENCE CONDITION AND CAUSE THE REAR AXLE TO LOCK.
THE DRIVER MAY NOT BE ABLE TO MAINTAIN DIRECTIONAL CONTROL OF THE VEHICLE AND A CRASH COULD OCCUR WITHOUT WARNING.
DEALERS WILL INSTALL A NEW REAR AXLE CROSS PIN FREE OF CHARGE. THE SAFETY RECALL BEGAN ON JANUARY 11, 2011. OWNERS MAY CONTACT CADILLAC AT 1-866-982-2339, CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463 AND AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
Campaign 10V643000 on NHTSA.gov
Representative owner complaints
366 reports, newest first.
Service brakes, May 21, 2012
PURCHASED TRUCK 11/10/2011 WITH 3 MILES ON IT. AT 4,000 MILES THE TRUCKS BRAKES STARTED PULSATING AND SHIMMING WHILE APPLING BRAKES GOING DOWN HILL. TOOK IT TO DEALER , THEY RESURFACED FRONT ROTORS. GOOD TILL 5,700 MILES AND IT STARTED DOING THIS AGAIN, BUT WORSE, ALSO PROBLEMS JUST BRAKING ANY WHERE. TOOK BACK TO DEALER, NOW THEY RESURFACED REAR DRUMS. I'M VERY DISAPPOINTED IN THIS NEW VEHICLE'S BRAKING SYSTEM. THEY WROTE THE BRAKES WERE WARPED DURING BOTH VISITS, AND NO REASON AS TO WHY THIS IS HAPPENING TO MY NEW VEHICLE. *TT
Electrical system, Electronic stability control (ESC), Apr 24, 2012
VEHICLE STALLS LOSING ALL POWER TO STEERING AND BRAKING CAPABILITIES. THERE IS NO ADVANCED WARNING OF POWER LOSS, IT SIMPLY QUITS RENDERING THE DRIVER INCAPABLE OF STEERING, MOVING OUT OF THE WAY OF TRAFFIC. HAS BEEN IN CERTIFIED GMC SHOP THREE TIMES, THEY KEEP INSISTING THEY CANNOT FIND PROBLEM AND THE VEHICLE BE PICKED UP. POTENTIAL DEATH TRAP. NOT ONLY UNSAFE FOR DRIVER BUT ALSO ANYONE BEHIND THE VEHICLE. *TR
Service brakes, Hydraulic, Electrical system, Exterior lighting, Apr 12, 2012
THE HEADLIGHTS DIM THEN RETURN TO NORMAL EVERY TIME THE BREAK IS APPLIED. INTERIOR LIGHTS DIM AND RETURN TO NORMAL WHEN HAZARD LIGHTS ARE ACTIVATED. DEALER FOUND THE COMPLAINT TO BE VALID. BATTERY TESTED AND FOUND TO BE GOOD. VOLTAGE TEST OF ALTERNATOR CHECKED OUT NORMAL. ENGINE AND BODY GROUNDS CHECKED OUT NORMAL. DEALER REPLACED BRAKE SWITCH WITH NEW PART WITH NO CHANGE. GENERAL MOTORS REFERENCED SERVICE BULLETIN #02-06-03-008D AND CLAIM THE TRUCK IS OPERATING AS DESIGNED. AFTER SEVERAL CONVERSATIONS WITH GM CUSTOMER SERVICE THEY TOLD ME THERE WAS NOTHING THEY WOULD DO ABOUT THE DESIGN OF THE SYSTEM AND I AM STUCK WITH THE TRUCK AS IS. THE GM SERVICE REPRESENTATIVE ALSO REFUSED TO SEND ME ANY DOCUMENTATION REGARDING MY CUSTOMER CLAIM AND DIRECTED ME BACK TO THE SERVICE BULLETIN AND THE DEALER. I HAVE INVESTED A LOT OF MONEY INTO THIS VEHICLE AND HAVE NO CONFIDENCE IN ITS SAFETY AT NIGHT. MY GM CUSTOMER CLAIM #[XXX]. THIS TRUCK WAS PURCHASED NEW AND I WOULD NOT ALLOW MY FAMILY TO OPERATE IT AT NIGHT AND I AM VERY CONCERNED ABOUT THE LIGHT SYSTEM FAILING OR SHORTING OUT AS THE VEHICLE GETS OLDER. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR
Vehicle speed control, Sep 2, 2011
I WAS GOING 40MPH WHEN I WENT TO STOP QUICK TO AVOID AN ACCIDENT. I PRESSED ON BRAKES TRUCK DID NOT SLOW DOWN THEN ALL OF A SUDDEN IT DID DOWN SHIFT BUT AT THAT THE TRUCK LUNGED FORWARD CAUSING ME TO CLIP THE TRUCK IN FRONT OF ME. *TR
Steering, Jun 29, 2011
ACCELERATING UP ON RAMP TO MA PIKE WITH WHEEL TURNED. WHILE MERGING WITH TRAFFIC AT SPEED WHEEL LOCKED IN TURNED POSITION. FORCED WHEEL BACK STRAIGHT WITH MUCH FORCE AND A LOUD POP SOUND FROM STEERING. DUE TO THE AMOUNT OF FORCE REQUIRED, MANY PEOPLE WOULD NOT BE ABLE TO UNLOCK WHEEL AND MAY CRASH. THIS HAS HAPPENED TWO TIMES IN LAST 30 DAYS. DEALER REFUSES TO MAKE REPAIRS, CLAIMS CAN NOT MAKE HAPPEN WHEN IN THEIR POSSESSION. DEALER'S ONLY INSTRUCTS TO PULL OFF ROAD NEXT TIME IT LOCKS AND CALL ONSTAR FOR ASSISTANCE. *TR
Suspension, Apr 27, 2011
2011 GMC SIERRA 1500. CONSUMER WRITES IN REGARDS TO RECALL NOTICE FOR THE REAR AXLE CROSS PIN FRACTURE *TGW THE CONSUMER STATED HE WAS NOT INFORMED THAT A RECALL WAS ISSUED PRIOR TO PURCHASING THE VEHICLE. *JB
Visibility, Mar 29, 2011
WIPERS AND WASHERS COME ON BY THEMSELVES SURPRISING THE DRIVER AND PARTIALLY OBSCURING HIS VISION. IT IS NECESSARY TO PULL OVER AND SHUT OFF THE IGNITION TO GET THEM TO STOP, THEN IT HAPPENS ANGAIN EVERY SO OFTEN DURING AN OUTING.
Power train, Mar 9, 2011
WHEN I FIRST DROVE MY NEW TRUCK I NOTICED A SUBTLE KNOCKING NOISE COMING FROM THE REAR WHEN DRIVING SLOWLY OVER A BUMP. THE DEALER'S MECHANIC AGREED THERE WAS SOMETHING WRONG AND CALLED GM TECH ASSISTANCE ([XXX]) AND FOUND THE REAR AXLE HAD TOO MUCH PLAY. THE GROVE ON THE AXLE THAT RETAINS THE C RETAINING CLIP WAS MACHINED TOO CLOSE TO THE END OF THE SHAFT. THEY REPLACED THE AXLE. ONLY A PERSON WITH MECHANICAL EXPERIENCE COULD HAVE DETECTED THE SUBTLE NOISE. HAD IT GONE UNDETECTED EVENTUALLY THE C CLIP WOULD LIKELY FAIL AND THE AXLE AND WHEEL WOULD HAVE SLID OUT OF THE DIFFERENTIAL HOUSING. I DOUBT THIS MACHINING FAULT ON THE AXLE IS UNIQUE TO MY TRUCK. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR
Steering, Feb 21, 2011
WHILE DRIVING DOWN THE INTERSTATE TODAY, THE STEERING LOCKED IN POSITION. IT TOOK BOTH HANDS TO FORCE IT TO TURN, AT WHICH A POP WAS HEARD FROM THE STEERING COLUMN AREA. VEHICLE HAS DRIVEN NORMALLY SINCE. TRUCK ONLY HAS 1,500 MILES ON IT. NO CONSUMER DEBRIS COULD HAVE CAUSED THE PROBLEM. *TR
Tires, Feb 19, 2011
OEM TIRES HAVE EXTREMELY POOR WET PAVEMENT TRACTION. FIRST INCIDENT OCCURRED LESS THAN 30 DAYS AFTER PURCHASING THE VEHICLE. IT HAD RAINED HEAVILY FOR AN EXTENDED TIME THAT DAY AND CONTINUING MODERATELY INTO THE EVENING. APPROACHING THE INTERSECTION WHERE I INTENDED TO MAKE A TURN ONTO A SIDE STREET, I BEGAN SLOWING TO WHAT I CONSIDERED A SAFE AND PRUDENT SPEED GIVEN THE ROAD CONDITIONS. UPON APPLYING THE BRAKES THE VEHICLE COULD NOT BE STOPPED RESULTING IN SLIDING COMPLETELY STRAIGHT THROUGH THE INTERSECTION, LUCKILY ON A GREEN SIGNAL LIGHT, AND WITH NO OTHER TRAFFIC IN MY PATH. REALIZING I WAS NOT SLOWING SUFFICIENTLY TO NEGOTIATE THE TURN, I DID NOT ATTEMPT TO TURN THE STEERING WHEEL AND CONTINUED DOWN THE SAME STREET TO A SAFE AREA TO TURN AROUND AND RETURN TO THE STREET I INTENDED TO TURN ONTO. SECOND INCIDENT, AGAIN ON WET PAVEMENT, WAS AFTER MAKING A COMPLETE STOP AT A TRAFFIC LIGHT CONTROLLED INTERSECTION. WHEN THE SIGNAL LIGHT CHANGED TO GREEN, I STARTED NEGOTIATING A LEFT TURN. APPROXIMATELY HALF WAY THROUGH THE INTERSECTION, AT A SPEED OF LESS THAN 10 MPH, REAR TIRES LOST TRACTION AND THE REAR OF THE VEHICLE TRIED TO SWAP ENDS. NEEDLESS TO SAY, MY WIFE YELLED AT ME TO STOP DOING WHATEVER IT WAS THAT I DID TO CAUSE SUCH ACTION, TO WHICH I REPLIED. I DID NOT DO ANYTHING OTHER THAN START MOVING FORWARD AT A SLOW PACE AND WAS JUST AS SURPRISED AS SHE WAS BY THE BEHAVIOR OF THE VEHICLE. *TR
Seat belts, Feb 9, 2011
TL*THE CONTACT OWNS A 2011 GMC SIERRA 1500. THE CONTACT STATED THE DRIVER SIDE SEAT BELT DID NOT HOLD AFTER IT WAS LATCHED. THE SEAT BELT WAS VERY LOOSE AROUND THE CONTACT. THE VEHICLE WAS NOT INSPECTED OR REPAIRED. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 1,000.
Vehicle speed control, Jan 19, 2011
2011 GMC SIERRA 1500 SLE CREW CAB Z71 4X4 COMING OFF OF THE EXPRESSWAY AND COMING TO A STOP AT A TRAFFIC LIGHT I APPLIED BRAKE PRESSURE. THE BRAKE PEDAL WAS UNUSALLY STIFF THEN ALL OF A SUDDEN THE ENGINE REVVED TO OVER 5000 RPM'S AND STARTING TO MOVE FORWARD. I HAD MY FOOT PUSHED FIRMLY ON THE BRAKE AND THE VEHICLE REMAINED REVVING AND MOVING FORWARD. I QUICKLY PUT IT IN PARK AND TURNED OFF VEHICLE. STARTED BACK UP AND NO ISSUES ON REMAINING DRIVE. CRUISE CONTROL WAS NOT ENGAGED. VEHICLE HAS LESS THAN 1400 MILES ON IT. *TR
Engine and engine cooling, Power train, Jan 14, 2011
TL* THE CONTACT OWNS A 2011 GMC SIERRA 1500. THE CONTACT WAS DRIVING UP AN INCLINE APPROXIMATELY 5 MPH AND PLOWING SNOW IN A RESIDENTIAL DRIVEWAY. WHEN THE CONTACT SHIFTED INTO REVERSE, THE VEHICLE BEGAN TO ROLL FORWARD AND THE ENGINE STALLED. THE VEHICLE CAME TO A STOP AFTER THE CONTACT APPLIED THE BRAKES REPEATEDLY. THE CONTACT STATED THAT THE FAILURE WOULD ALSO OCCUR WHEN DRIVING FORWARD ON AN INCLINE. THE VEHICLE WAS TAKEN TO A DEALER WHERE THE TECHNICIAN PERFORMED A ROAD TEST AND INFORMED THE CONTACT THAT THE VEHICLE WAS OPERATING AS DESIGNED. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 800.
Power train, Dec 28, 2010
TL* THE CONTACT OWNS 2011 GMC SIERRA 1500. THE CONTACT WAS DRIVING 50 MPH WHEN THE VEHICLE HESITATED AND WAS SLOW TO ACCELERATE. THE VEHICLE WAS TAKEN TO THE DEALER AND THEY ADVISED THAT THERE WERE NO FAILURES AND THE VEHICLE WAS OPERATING AS DESIGNED. THE VEHICLE WAS NOT REPAIRED. THE FAILURE AND CURRENT MILEAGE WAS 1,500 UPDATED 02/23/11 *BF THE CONSUMER STATED THE VEHICLE WOULD HESITATE ON ACCELERATION. WHENEVER HE ATTEMPTED TO ACCELERATE, THE ENGINE WOULD LAG BEHIND FOR A SPLIT SECOND. WHEN THE ENGINE DID ENGAGE, THE DRIVE TRAIN WOULD BANG FROM THE ENGINE ACCELERATING. THE CONSUMER ALSO STATED THE VEHICLE WOULD NOT HOLD IN STEADY SPEED HIGH GEAR. THE TRANSMISSION WOULD CONTINUALLY GO BETWEEN 5TH AND 6TH GEAR. WHEN IN 6TH GEAR, THE VEHICLE WOULD LOSE SPEED. UPDATED 05/05/11
Vehicle speed control, Dec 28, 2010
SECOND REPORT - SUDDEN ACCELERATION. 2011 GMC SIERRA PU TRUCK. ON DECEMBER 20, 2010 I WAS TRAVELING TO VISIT FRIENDS. WHILE ON HIGHWAY I SET THE CRUISE CONTROL FOR 70 MPH. I EXITED THE FREEWAY AND TRAVELED APPROXIMATELY 5 MILES ON CITY STREETS. UPON ENTERING A BEDROOM TOWNSHIP KNOWN FOR SPEED TRAPS I ATTEMPTED TO ENGAGE THE CRUISE CONTROL FOR 30 MPH. WHEN PRESSING THE CRUISE CONTROL TO SET THE SPEED I WAS TRAVELING (30 MPH) THE TRUCK DOWN SHIFTED AND ACCELERATED RAPIDLY (TO 4000 RPM). I IMMEDIATELY TAPPED THE BRAKE AND THE CRUISE CONTROL DISENGAGED. THIS IS THE SECOND TIME FOR THIS TRUCK TO DOWN SHIFT AND ACCELERATE RAPIDLY. A PREVIOUS REPORT WAS MADE IN NOVEMBER 2010. *TR
Power train, Dec 2, 2010
ON NOVEMBER 18, 2010, RETURNING FROM VACATION, DRIVING A NEW 2011 GMC SIERRA SLE PICK UP WITH LESS THAN 2,000 MILES USE, PULLING A 24' TRAVEL TRAILER. THE TRUCK WAS IN "TOW" MODE DESCENDING A 15% GRADE HILL AT APPROXIMATELY 45 MPH. I WAS NOT ACCELERATING WHEN THE TRUCK DOWN SHIFTED ITSELF AUTOMATICALLY FROM 5TH TO 3RD GEAR AND THE ENGINE ACCELERATED TO 4000 RPM. I APPLIED BRAKES AND TRUCK SHIFTED BACK TO 5TH GEAR. FORTUNATELY CONDITIONS WERE DRY AND NO ACCIDENT OCCURRED. CRUISE CONTROL WAS NOT ENGAGED AT THE TIME AS TERRAIN WAS VERY HILLY AND TWISTING. TRUCK SHIFTED AND ACCELERATED WITHOUT WARNING. CONTINUED TRIP WITHOUT FURTHER PROBLEMS. *TR