2013 GMC Sierra 1500
Problems, recalls and owner-reported issues
Air bags is the leading concern among 167 owner complaints filed for this model year. This is the 13th highest complaint count among 26 Sierra 1500 model years with reports.
Of the 2013 reports, 6 involved a crash and 2 involved a fire. 10 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 2013 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500/3500, Yukon, and Yukon XL 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 2010 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500/3500, Yukon, and 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." Additionally, GM is recalling certain 2009 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500/3500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming or "Zone C."
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 24, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed on May 11, 2021. Owners may contact Cadillac customer service at 1-800-458-8006; Chevrolet customer service at 1-800-222-1020; and GMC customer service at 1-800-462-8782. GM's number for this recall is N212328790.
Campaign 21V053000 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
Representative owner complaints
167 reports, newest first.
Air bags, Mar 23, 2014, crash
WHILE DRIVING IN THE MOUNTAINS, I SWERVED TO MISS AN ANIMAL, TOOK THE DITCH, HIT TWO TREES, SOME BOULDERS AND THE AIRBAGS DID NOT DEPLOY. I WAS TRAVELING AT ABOUT 47 MPH. THE ACCIDENT REPORT SHOWED DAMAGES TO EVERY PART OF THE TRUCK EXCEPT THE ROOF AND TAILGATE. WE HAD A GRILL GUARD INSTALLED AT A GMC DEALERSHIP UPON PURCHASE, AND HAD IT NOT BEEN FOR THAT GUARD, THE ENGINE WOULD HAVE BEEN IN OUR LAPS. THE TRUCK SUSTAINED 20,000 DOLLARS IN DAMAGES, YET ALL GM HAD TO SAY WAS THAT THE AIRBAGS OPERATED AS DESIGNED. I SAY THAT THE DESIGN IS FATALLY FLAWED IF A CRASH OF THIS MAGNITUDE DOES NOT CAUSE THIS VERY IMPORTANT SAFETY FEATURE TO OPERATE. THE FOLKS WHO TOWED THE VEHICLE HAD SOME VERY STRONG OPINIONS ABOUT THIS FAILURE, AND SAID THAT THE GRILL GUARD WAS THE ONLY THING WHICH SAVED US, AND THAT HAVING IT INSTALLED SHOULD NOT HAVE HAD ANY EFFECT ON THE FUNCTION OF THE AIRBAGS. *TR
Power train, Mar 18, 2014
HELLO, THE DATE AND MILEAGE ABOVE IS NOT ACTUAL DATE OF FIRST INCIDENT, BUT IS THE FIRST TIME I TOOK IT IN FOR THE FIRST OIL CHANGE AND VEHICLE INSPECTION WHICH ALSO WAS THE FIRST TIME I COMPLAINED TO THE DEALERSHIP ABOUT THE ISSUE. MY TRANSMISSION SLIPS BETWEEN 2ND AND 3RD GEAR AT LEAST 4 TIMES A MONTH. THE DEALER TOLD ME THAT IF I CANT PROVE IT OR IF IT DOESN'T DO IT WHEN THEY DRIVE IT THEN THEY CANT PERFORM A DIAGNOSTIC TEST TO FIX THE PROBLEM. THE SELLER WHO SOLD ME THE VEHICLE CALLED ME TWICE TO SEE HOW IM ENJOYING MY TRUCK AND I COMPLAINED TO HIM BOTH TIMES ABOUT THE ISSUE AND HE TOLD ME THE SAME THING ABOUT MY ISSUE. I EVEN LEFT VOICEMAILS TO HIM ABOUT IT AND HE NEVER RETURNED MY CALLS UNTIL I MADE A YEAR (3/16/14) OWNING MY TRUCK AND CLAIMS HE DON'T REMEMBER ME TELLING HIM THIS THE FIRST TIME. IM A STRONG GM FAN BUT I FEEL IM NOT BEING HELPED WITH MY ISSUE AND ITS ANNOYING THAT I HAVE TO DRIVE MY TRUCK CAUTIOUS GUESSING WILL IT SLIP THIS TIME OR WILL IT SLIP NEXT TIME? IF ITS PROFESSIONAL GRADE THEN WHY AM I HAVING THIS PROBLEM? I USE MY TRUCK FOR FAMILY VACATIONS AND I KNOW ANYONE WITH THE SAME PROBLEM WOULD NOT DRIVE THIS TRUCK FAR AWAY FROM HOME WITH THIS ISSUE. IT DOES IT WHEN IT WANTS TO BUT ITS JUST FUNNY HOW IM TRYING TO FIGURE OUT WHEN IT WILL DO IT AGAIN. I GET ALL THESE EMAILS ASKING ME TO RATE THE DEALERSHIP 5 STARS AND TO RATE THE TRUCK BUT I CANT EVEN GET MY TRUCK CHECKED OUT. THEN THEY TELL ME THEY WONT GIVE ME A RENTAL WHICH I WOULD NEED ANOTHER TRUCK AS A RENTAL. THIS IS SAD I SPEND 30 GRAND ON A TRUCK I CANT GET WORKED ON UNLESS I HAVE PROOF. *TR
Service brakes, Mar 15, 2014
SEVERE STEERING WHEEL VIBRATION WHEN BRAKING AT 40 PLUS MPH. *TR
Electrical system, Structure, Mar 10, 2014
MICE, RABBITS ETC. CHEWED THROUGH WIRES BECAUSE GMC PUTS PEANUT OIL ON THEIR WIRES. GMC DEALER SAID THEY WOULD FIX WIRES BUT THE PROBLEM WILL PERSIST BECAUSE PEANUT OIL IS BAIT FOR THESE ANIMALS. THIS IS A PROBLEM THAT WAS REPORTED ON A 2012 VEHICLE. THIS COULD CAUSE FIRES ETC AND NEEDS TO BE FIXED. THE VEHICLE WASN'T RUNNING RIGHT, ENGINE LIGHT WAS ON AND CHEWED WIRES WERE DISCOVERED. WERE TOLD BY GMC DEALER THERE IS NO PERMANENT FIX BECAUSE THEY USE PEANUT OIL BECAUSE ITS CHEAP! WE'VE ONLY HAD THE VEHICLE SINCE SEPTEMBER 2013. GMC WILL PUT THE WIRES TOGETHER AGAIN BUT NOT FIX THE MAIN PROBLEM OF THE PEANUT OIL. THIS IS A PROBLEM THAT IS COMPLETELY AVOIDABLE, YET A PROBLEM THAT IS BUILT INTO THE VEHICLE. *TR
Air bags, Jan 24, 2014
TL* THE CONTACT OWNS A 2013 GMC SIERRA. THE CONTACT WAS DRIVING APPROXIMATELY 40 MPH AND BECAME INVOLVED IN A SIX VEHICLE CRASH. THE CONTACT'S AIR BAGS FAILED TO DEPLOY ON IMPACT. THERE WERE NO INJURIES. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC, WHO DIAGNOSED THAT THE FRONT END, RIGHT QUARTER PANEL AND THE REAR BUMPER NEEDED TO BE REPLACED. THE VEHICLE HAD NOT BEEN REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 33,010.
Engine, Nov 20, 2013
TRUCK IS LEAKING OIL, AND I HAVE A SMALL PUDDLE OH GARAGE FLOOR. BROUGHT TO ORIGINAL SELLING DEALER TO BE CHECKED. THEY CLAIMED THERE WAS A PLUG ON BACK OF ENGINE THAT WAS LEAKING. THEY HAD VEHICLE FOR 3 1/2 DAYS, AND CLAIMED IT WAS FIXED. THEY HAD OVER 1 PAGE OF SEALS, GASKETS, PLUG WERE REPLACED. DROVE APPROXIMATELY 50 MILES, AND IT STARTED LEAKING EXACTLY THE SAME AS BEFORE. RETURNED TO DEALER AGAIN, AND WAS TOLD BY THE SERVICE TECHNICIAN THAT IT WAS NORMAL TO SEE IT HAVING A LEAK DUE TO THE SILICONE THAT WAS USED ON ENGINE PARTS WHEN IT WAS BUILT !!! I WAS ADVISED TO DRIVE IT FOR 1 WEEK AND BRING IT BACK AGAIN. AT THAT POINT IN TIME, I CONTACTED GM AND WAS TOLD TO GET A SECOND OPINION AT ANOTHER DEALERSHIP. I BROUGHT IT TO THEM ON 11/15/13. IT HAS BEEN THERE NOW FOR 6 DAYS. I WAS JUST TOLD THAT THEY HAVE 4 PAGES OF NEW PARTS THAT HAVE TO BE ORDERED TO REPAIR IT. THEY (DEALERSHIP) REQUESTED THAT GM REPLACE THE ENGINE AND WAS DENIED. CONSIDERING THIS IS THE 3RD TIME TRYING TO REPAIR THE SAME PROBLEM, THEY SHOULD EITHER RE-PURCHASE OR LEMON LAW THIS. *TR
Power train, Structure, Nov 6, 2013
AT THIS OCCURRENCE THE HOOD LATCH DOES NOT KEEP THE HOOD TIGHT WHEN CLOSED. THE HOOD RATTLES AT SPEEDS OVER 35MPH AND APPEARS AS THOUGH IT IS GOING TO OPEN. AS A RESULT OF ATTEMPTING TO SUFFICIENTLY SECURING THE HOOD, I SUBSEQUENTLY DENTED THE HOOD. I HAVE HAD THE BODY DEPARTMENT AT THE LOCAL DEALERSHIP LOOK AT IT AND THEY FOUND THAT THE HOOD LATCH NEEDED TO BE ADJUSTED. AFTER ANOTHER 2500 MILES, THIS RATTLE HAS RETURNED. THE COMPLAINT IS THAT THIS IS THE SECOND 2013 SIERRA DENALI THAT I HAVE OWNED SINCE OCTOBER 2012, SINCE THE DEALERSHIP BOUGHT BACK THE FIRST ONE AFTER NUMEROUS PROBLEMS INCLUDING THE TRANSMISSION BEING REPLACED AT 6250 MILES AND NUMEROUS EFFORTS TO FIX THE HOOD. SAME PROBLEM TWO TRUCKS IS A CAUSE FOR CONCERN! *TR
Service brakes, Nov 5, 2013
VIBRATION IN FRONT BRAKES, WHEN BRAKING AROUND 55 - 60 MPH. *TR
Power train, Oct 11, 2013
TL* THE CONTACT OWNS A 2013 GMC SIERRA 1500. WHILE DRIVING 40 MPH, THE CONTACT STATED THAT THE VEHICLE WOULD JERK AND SHIFT IN BETWEEN GEARS. THE VEHICLE WAS TAKEN TO THE DEALER BUT WAS NOT REPAIRED NOR WAS THE FAILURE DIAGNOSED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 200.
Seats, Oct 7, 2013
THE HEAD RESTS OF OUR NEW TRUCK (PURCHASED DEC 2012) PROJECT SO FAR FORWARD THAT IT FORCES MY HEAD TO TILT DOWNWARD. THERE IS NO FORWARD/BACK ADJUSTMENT TO THE HEAD REST, AND TURNING THE HEAD REST BACKWARDS TO MAKE IT BEARABLE MEANS IT NO LONGER WILL SERVE WELL TO PREVENT NECK INJURIES IN A CRASH. FOR SHORTER DRIVES, THE FORCED HEAD TILT IS UNCOMFORTABLE, BUT FOR LONGER DRIVES IT CAUSES ENOUGH PAIN THAT I HAD TO SEE A CHIROPRACTOR (AND I'M AN ATHLETIC, HEALTHY PERSON!). THE DEALER AND MANUFACTURER CONTEND IT WORKS AS DESIGNED FOR SAFETY IN A CRASH. BUT IF I CAN'T SIT IN IT FOR NORMAL DRIVING WITHOUT EXPERIENCING NECK/BACK PAIN, HOW "SAFE" IS THAT? I NOTICED THE NEW 2014 GMC 1/2-TON PICKUPS HAVE A HEAD REST WITH A NOTICEABLY LESS ANGULAR DESIGN, INDICATING GMC RECOGNIZED THE HEAD REST DESIGN IN MY 2013 3/4-TON TRUCK IS, AT BEST, A POOR ONE AND, AT WORST, A POTENTIALLY DANGEROUS ONE. IS THERE ANY RECOURSE TO GETTING GMC TO REPLACE MY HEAD RESTS WITH THE NEW DESIGN (OR EVEN AN OLDER ONE, LIKE THE STRAIGHT-UP-AND-DOWN ONES I HAVE IN MY 2003 CHEVY TAHOE)? *TR
Power train, Oct 6, 2013
THE TRANSMISSION ON THIS VEHICLE SLIPS SOMETIMES BETWEEN 2ND AND 3RD GEAR AND ALSO WHEN PARKED ON A HILL AND PUT INTO DRIVE THE TRANSMISSION SHIFTS LATE INTO 1ST GEAR. *TR
Visibility/wiper, Sep 3, 2013
TL* THE CONTACT OWNS A 2013 GMC SIERRA. THE CONTACT WAS DRIVING AT VARIOUS SPEEDS AND NOTICED A WIND NOISE COMING FROM THE WINDOW. THE VEHICLE WAS TAKEN TO THE DEALER FOR DIAGNOSIS BUT THEY WERE UNABLE TO DUPLICATE THE PROBLEM, STATING THAT THE VEHICLE WAS OPERATING AS DESIGNED. THE MANUFACTURER WAS NOTIFIED. THE APPROXIMATE FAILURE MILEAGE WAS 300.
Vehicle speed control, Jul 30, 2013
TL* THE CONTACT OWNS A 2013 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE DRIVING 50 MPH, THE VEHICLE SUDDENLY ACCELERATED TO 70 MPH. THE CONTACT WAS ABLE TO STOP THE VEHICLE BY APPLYING THE BRAKES. THE CONTACT TOOK THE VEHICLE TO THE DEALER. THE DEALER DID NOT PERFORM A DIAGNOSTIC TEST. THE DEALER STATED THE DIAGNOSTIC TEST WAS UNNECESSARY. THERE WERE NO REPAIRS MADE TO THE VEHICLE. THE FAILURE MILEAGE WAS 3,000. ...UPDATED 08/22/13 *BF THE DEALER WAS UNABLE TO FIND A PROBLEM. UPDATED 08/22/13
Electrical system, Jul 29, 2013
TL* THE CONTACT OWNS A 2013 GMC SIERRA. THE CONTACT STATED THAT WHILE REVERSING, THE PARK ASSIST LIGHT ILLUMINATED. THE VEHICLE WAS TAKEN TO THE DEALER FOR DIAGNOSIS BUT THEY WERE UNABLE TO DUPLICATE THE PROBLEM. THE MANUFACTURER WAS NOTIFIED. THE APPROXIMATE FAILURE MILEAGE WAS 5,000. UPDATED 9/17/13*CN
Electronic stability control (ESC), Jun 8, 2013
*ISSUE IS WARNING LIGHT AND TONE THAT THE STABILITRAK SYSTEM REQUIRES SERVICING - THIS IS NOT THE STANDARD WARNING LIGHT THAT THE WHEEL TRACTION VARIES* I HAD A 2011 GMC SIERRA WHICH I BROUGHT BACK TO THE DEALERSHIP AND CALLED GMC ABOUT FOR 6 ISSUES WITH THE STABILITRAK WARNING LIGHT. EVEN WITH GMC CORPORATE INVOLVEMENT, ISSUE WAS NOT CORRECTED DESPITE REPLACEMENT OF NUMEROUS SENSORS, ETC. IN ORDER TO AFFORD TO BUY A NEW 2013 VEHICLE, I TRADED THAT TRUCK AND ANOTHER FOR THE ABOVE-NOTED GMC TRUCK AND 2-DAYS AFTER THE PURCHASE THE SAME PROBLEM HAS OCCURRED AT THE VERY SAME SPOT ON MY DRIVE HOME FROM WORK. I CALLED GMC AND NOTIFIED THE DEALERSHIP. THEY CANNOT FIX THE PROBLEM SO I WILL WAIT FOR THREE MORE INSTANCES AND WITH DRIVING A LOANER CAR FOR UP TO 3-WEEKS AT A TIME AND WILL INVOLVE THE LEMON LAW FOR DEFECTS WITHIN THE FIRST YEAR OF OWNERSHIP. OF COURSE THE FEDERAL GOVERNMENT WILL DO NOTHING EXCEPT PROVIDE GMC WITH MORE TAXPAYER-FUNDED BAILOUT MONEY! THERE ARE NUMEROUS COMPLAINTS ONLINE ABOUT DEFECTS WITH THIS COMPLICATED SYSTEM THAT IS SO DEEPLY EMBEDDED IN THE CARS' RUNNING THAT IT CANNOT BE REPAIRED. WHAT DOES IT TAKE FOR YOU TO DO SOMETHING ABOUT THIS CONSUMER RIPOFF???? *TR
Electrical system, Interior lighting, Nov 27, 2012
TL* THE CONTACT OWNS A 2013 GMC SIERRA 3500. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 5 MPH, THE BRAKE PEDAL WAS DEPRESSED AND THE CONTACT HEARD A LOUD SLOSHING NOISE OF FUEL COMING FROM THE FUEL TANK. IMMEDIATELY WHEN THE SOUND EMITTED A VIOLENT AND FORCEFUL MOVEMENT FROM THE EXTERIOR REAR OF THE VEHICLE OCCURRED. THE CONTACT CONTINUED TO DRIVE. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER WHICH INFORMED THE CONTACT THAT THE VEHICLE OPERATED NORMALLY. IN ADDITION, THE INSTRUMENT CLUSTER AND RADIO WOULD NOT DIM IN THE NIGHT MODE. THE MANUFACTURER WAS NOTIFIED OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 150. UPDATED 01/22/13*LJ THE CONSUMER ALSO STATED GM HAS A SERVICE BULLETIN OUT ON THE CONDITION THAT HAS EXISTED SINCE THE 2007 MODEL YEAR. THERE IS ALSO A NIGHT TIME LIGHTING ISSUE WITH THE INABILITY TO DIM FURTHER, THE DASH LIGHTS OR TO TURN THEM OFF COMPLETELY. UPDATED 01/24/13
Fuel/propulsion system, Oct 26, 2012
UPON LOW SPEED PANIC STOPPING WITH THE FUEL GAUGE READING 3/4 OF A TANK AND BELOW, THERE IS A VIOLENT/NOTICEABLE BUMP. LIKE BEING REARENDED AT LOW SPEED. IT IS A SITUATION THAT GM HAS A BULLETIN OUT ON #PIT5161 OR DOC ID:2851139 FOR THE 2007-2012 CHEV. SILVERADO AND GMC SIERRA P/U WITH THE 34 OR 36 GALLON TANKS. I FEEL THE BRAKES ARE CHALLENGED BY THIS CONDITION, AND EVEN MORE SO ON SLIPPERY, STEEP TERRAIN. *TR