2012 GMC TERRAIN Power Train Problems

1. The engine suddenly lost power while driving during evening rush hour and the vehicle would no longer accelerate. 2. Because the vehicle could not maintain speed, I was unable to keep up with traffic, creating a serious safety hazard that could have resulted in a major accident. 3. The vehicle has been inspected by an independent service center for diagnosis. 4. During the incident, the “Engine Power Reduced” warning indicator illuminated just before the loss of power occurred. 5. As the vehicle slowed and came to a complete stop at an intersection, it remained unresponsive. When the traffic light turned green, the vehicle would not accelerate at all.

GMC Consumer Relations Subject: Structural Undercarriage Safety Defect – 2012 GMC Terrain SLE Vehicle Information: Year/Make/Model: 2012 GMC Terrain SLE VIN: [XXX] Mileage at Purchase: 148,305 Date of Purchase: [XXX] Location: Rochester, New York I am filing a complaint regarding a severe undercarriage safety defect in my 2012 GMC Terrain SLE. The rear undercarriage of this vehicle shows heavy structural corrosion on suspension brackets and mounts. The condition produces clanging noises during normal driving, and an independent licensed mechanic has refused to work on the vehicle because the suspension integrity is unsafe. When I returned the vehicle to the dealer, I observed additional brackets being attached under the rear subframe area, suggesting reinforcement of compromised structural points. This confirms that the corrosion directly affects suspension geometry, alignment, and stability. This corrosion is not cosmetic. It is advanced structural deterioration affecting the mounting points for trailing arms and lateral links. These...

hello i'm writing this letter to inform you about my 2012 Terrian i have had nothing but problems with the motor and now the muffler system i have had all recalls done on this and GM is well aware of this problem i have a dealer ship to replace the timing in this motor and still uses oil and still have all the problems after the recalls have been fixed now they want me to pay over $3,000 to have new catalytic converters fixed on it now after paying $2800 for a new timing seems to me GM likes to fix the cheap stuff on these cars and make customers pay for the expensive parts must people can't afford this and junk the vehicle i will not i'm going to fight for what is right the dealer ship even told me when i took it back in to see what...

The contact owns a 2012 GMC Terrain. The contact stated that while driving at 65 MPH, the vehicle inadvertently lost all motive power. The contact was able to pull to the shoulder of the roadway, where the vehicle was able to restart, but failure persisted. The traction control warning light was illuminated. The vehicle was towed to an independent mechanic, who was able to diagnose the failure, but the contact was unable to recall the specifics. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was unknown.

My 4 cyl. AWD GMC Terrain has had excessive oil use which caused premature failure of the timing chain, loss of power/compression, blown engine, damage to exhaust manifold, cellinoids, and melted the catalytic converter. Its was a road safety, poor emissions due to failed catalytic converter. Headlights are too bright for oncoming traffic at night. Another road & safety hazard. Auto warranty is refusing to cover parts listed above caused by the timing chain and excessive oil consumption problems.

The contact owns a 2012 GMC Terrain. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently lost motive power. The contact was able to coast the vehicle to the shoulder of the roadway, and the vehicle failed to restart. No warning lights were illuminated. The vehicle was not taken to the dealer nor an independent mechanic. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was unknown.

First off before I got the car it had gone through a tune up. About a couple months after I got the car little things started to happen it would rock back and forth while idling I thought it was kind of an indicator that it needed oil but the percentage was still at a decent range and telling me it didn't need oil plus I hadent driven it 3000-5000 miles. Then engine light came on had it inspected codes ran came back telling me something about Throttle body So I purchased a whole new throttle body in Prosser at dealership costing me some booko buks and swapped it out when I got back home I then took it for test drive along with my 4 kids in the vehicle with me and then a little ways about 20 mins driving engine power reduced light came on along with stabilitrak...

I still have more to add to my other complaint. The fire started with alternator apparently there were crossed wires took alternator back to Orielys where I got it warrented out fixed the expanded wiring and replaced a hose and other things damaged by the little fire. Then after that things kept getting worse. Then it was spark plugs that were rusted that I replaced eventually I complained back to the dealership I got the car from and they agreed to help repair it after a posting by me on fb that I wasent a happy customer basically and that I literally had a sitting duck. Turns out the timing chain needed to be replaced and other little things. I've replaced O2 sensors camshaft sensors gaskets in catalytic converter had it inspected thinking it was a clogged exhaust the excessive oil usage was insane I would be going through 5quarts...

MASSIVE OIL CONSUMPTION!! Ever si Fr the purchase of the vehicle there has been massive oil consumption leak. Taken back to the dealer for service to take care of the problem, they claim they don’t see a problem! This car has been oil leaking and also draining oil somewhere to the engine causing also power rain engine issues and also contact oil light on. Reported to GMC as well and corporate, no response! This vehicle has cut off and lost power because of oil consumption on highway with my children in the car! I have been emailing with no avail! This matter needs to be rectified immediately! It is a death trap!

I just spent 1,600 dollars to replace the timing chain. I know their were recalls on this, I was wondering why my vin and model were not included in these recalls?

Excessive oil consumption caused blown engine

I am having trouble with these things now. The powertrain especially I have not had accident yet but it keeps going dead on me in the middle of driving down road. Causing me to have to put in neutral and restart. At this time the steering goes out. This needs to be repaired before an accident does happen. The drivers seat does not move forward or backwards. The tire pressure warning does not warn until it is at 20 psi.

Says powertrain control module failure. Also oxygen sensor on the my gmc app. It keeps cutting off in the middle of road.

BURNING OIL ENGINE POWER REDUCED BUCKING STALLING

TL* THE CONTACT OWNS A 2012 GMC TERRAIN. THE CONTACT STATED THAT HE WAS INFORMED THAT THERE WAS NO OIL INSIDE THE VEHICLE UPON TAKING THE VEHICLE TO AN INDEPENDENT MECHANIC FOR THE FIRST OIL CHANGE. NO WARNING LIGHTS APPEARED ON THE INSTRUMENT PANEL PRIOR TO THE DISCOVERY. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND THE CONTACT WAS GIVEN A VOUCHER TO HAVE THE VEHICLE INSPECTED. THE CONTACT WAS INFORMED THAT THE FAILURE WAS DUE TO DEFECTIVE PISTON RINGS THAT WERE TOO EXPENSIVE TO BE REPLACED. AS A RESULT, THE ENGINE BECAME INOPERABLE. THE VEHICLE WAS DIAGNOSED WITH ENGINE FAILURE. PRIOR TO THE ENGINE FAILURE, THE CONTACT ALSO STATED THAT THE VEHICLE REVVED AND ACCELERATED INDEPENDENTLY WITHOUT WARNING, WHILE DRIVING AT VARIOUS SPEEDS. THE CONTACT NOTED THAT PRIOR TO THE ENGINE FAILURE, BOTH WINDSHIELD WIPERS WERE DEFECTIVE DUE TO THE WINDSHIELD WIPER TRANSMISSION. BOTH WINDSHIELD WIPERS WERE REPLACED ON...

CAR IS BURNING EXCESSIVE AMOUNT OF OIL. NOW THE ENGINE HAS SEIZED UP

CODE-P0014-CAMSHAFT POSITIONB TIMING OVER-ADVANCED OR SYSTEM.CODE-P0300 RANDOM/MUITIPLE CYLINDER MISFIRE.COMPUTERIZED ENGINE ANALYSIS.RECALLS#50490-50491

HAVE A SERIOUS OIL CONSUMPTION PROBLEM HAVE TO HAVE OIL CHANGED EVERY 500 MILES, IT STARTS TO SHAKE WHEN START UP IT TURNS OFF KEEP GETTING CAMSHAFT CODES ALSO GOT MISFIRE CODE

VEHICLE SHUTS OFF WHEN SLOWING TO A STOP AND HAVE TO RESTART IN ORDER TO ACCELERATE. THAT WAS LOOKED AT AND 'FIXED' AND NOW THE VEHICLE SHAKES WHEN SLOWING DOWN AND HEADLIGHTS DIM AS IF IT IS TRYING NOT TO SHUT OFF. ENGINE IS VERY ROUGH AND RATTLES WHILE STARTING TO ACCELERATE AND ACCELERATING. WHEN BRAKES ARE PUSHED THE CAR STARTS TO TURN OFF WHILE IN MOTION. WHEN STOPPED, CAR SHAKES AND THERE IS A VERY HARD KNOCKING COMING FROM THE ENGINE.

TRANSFER CASE WENT AT 67K JUST BOUGHT IT USED AT 63K. I HAD NO WARRANTY ONLY 60 DAY FROM USED DEALER I BOUGHT IT FROM. RUINED MY PASSENGER SIDE AXEL ALSO WHEN TRANSFER CASE WENT $1137 WAS THE BILL. 500 FOR USED CASE 16K 170 FOR AXEL 30 FOR FLUID REST IN LABOR. SHOULD BE A RECALL CAR SOUNDED AWFUL BACK UP AND IN DRIVE LOSS A BIT OF POWER WHEN DRIVING. ALSO.

TL* THE CONTACT OWNS A 2012 GMC TERRAIN. WHILE DRIVING VARIOUS LOW SPEEDS, THE VEHICLE STALLED AND SHUT OFF WITHOUT WARNING. AFTER THE VEHICLE WAS RESTARTED, THE VEHICLE JERKED AND THEN RESUMED NORMAL OPERATION. THE DEALER AND MANUFACTURER WERE NOT NOTIFIED OF THE FAILURE. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 101,000.

WHILE DRIVING A SHORT DISTANCE ON A CITY STREET I HEARD A THUD FOLLOWED BY A GRINDING NOISE AND LACK OF POWER. VEHICLE WAS TOWED TO A TRUSTED MECHANIC THAT I HAVE KNOWN AND USED FOR YEARS. DIAGNOSED WITH A CRACK IN THE TRANSFER CASE. MECHANIC HAD DIFFICULTY FINDING A PART AND WAS INFORMED BY SOMEONE AT THE GMC DEALER THAT THIS PART WAS ON BACK ORDER BECAUSE OF AN ISSUE KNOWN BY GMC BUT A RECALL HAD NOT BEEN ISSUED. NEW PART WOULD NOT BE AVAILABLE FOR OVER A MONTH AND REPAIRS WERE NEEDED SINCE IT IS MY PRIMARY VEHICLE. A USED PART WITH A WARRANTY WAS FOUND AND WAS INSTALLED FOR A TOTAL OF $1500. VEHICLE POWER TRAIN WARRANTY WAS EXPIRED. LESS THAN 3 MONTHS AFTER TRANSFER CASE WAS REPLACED WITH A USED PART - THE REPLACEMENT PART CRACKED IN THE SAME EXACT SPOT AS THE ORIGINAL. LUCKILY,...

REAR MAIN SEAL LEAK, PVC VALVE FREEZES FROM WATER CONDENSATION AND LOW TEMPERATURES: CAUSING CRANK CASE GASES TO BECOME HIGHLY PRESSURIZED AND BLOW OUT THE REAR MAIN SEAL OF THE ENGINE CAUSING A MASSIVE OIL LEAK ON THE ROAD TO THE REAR TIRES POSSIBLY CAUSING LOSS OF CONTROL TO THE REAR WHEELS CAUSING THE POSSIBILITY OF A FATAL LOSS OF CONTROL VEHICLE ACCIDENT. OTHER POSSIBILITIES OIL COATING ENTIRE UNDERCARRIAGE OF VEHICLE CAUSING A VEHICLE FIRE, CATISTROPHIC ENGINE DAMAGE CAUSING LOSS OF CONTROL, ENVIROMENTAL IMPACT 5 QUARTS OF OIL ON THE HIGHWAY.

I ALSO HAVE A 2012 GMC TERRAIN THAT HAS AN OIL CONSUMPTION ISSUE THAT HAS CAUSED COMPLETE ENGINE FAILURE. APPROXIMATELY 2.5 WEEKS AGO THE CAR WOULDNT START. ENGINE WOULD TURN OVER BUT NOT START. I THOUGHT THAT IT MIGHT BE THE FUEL PUMP. HAD IT TOWED TO MY MECHANIC SINCE IT HAS 87K MILES AND OUT OF WARRANTY. SO I WENT TO CHECK THE STATUS OF THE CAR AND THE FIRST THING I WAS TOLD WAS THERE WAS NO OIL WHEN THEY CHECKED IT. THEY ADDED 4 QUARTS BEFORE TRYING TO DIAGNOSE THE PROBLEM. MIND YOU THE OIL WAS CHANGED 3K MILES AGO AND OIL LIFE MONITOR SAID IT HAD 54% LIFE LEFT. THEY RAN THE CAR FOR CODES AND THE ONLY CODE THAT CAME UP WAS FOR THE TIRE PRESSURE SYSTEM, ALSO AN ISSUE WITH THE TERRAIN. NO ISSUE WAS FOUND WITH FUEL PUMP OR SENSORS. SPARK PLUGS WERE...

EXCESSIVE ENGINE OIL CONSUMPTION. TIMING CHAIN FAILURE. PISTONS, RINGS, EXHAUST MANIFOLD, MUFFLER, DOOR REGULATOR, WIPER MOTOR, TRANSMISSION FAILURE. VEHICLE CANNOT BE DRIVEN

WHILE DRIVING THE VEHICLE, I EXPERIENCED STRONG KNOCKING VIBRATIONS AND SOUNDS SEEMINGLY COMING THROUGH THE FLOORBOARD. AS I CONTINUED DRIVING FOR ABOUT 5 MILES TRYING TO GET HOME, THE KNOCKING BECAME MORE PRONOUNCED AND MY STEERING WAS AFFECTED. I ALSO BEGAN NOTICING AN EXTREMELY STRONG ODOR NECESSITATING LOWERING WINDOWS TO BREATHE. I NOTIFIED MY DEALERSHIP AND TOOK THE VEHICLE IN FOR DIAGNOSIS THE VERY NEXT MORNING WITHOUT DRIVING IT AFTER ARRIVING TO MY GARAGE. I WAS TOLD THE AWD HAD COMPLETELY DETERIORATED. MY CONCERN WAS THAT I NEVER RECEIVED ANY DASHBOARD NOTIFICATION OF THE PROBLEM, NOT DID MY ONSTAR DIAGNOSIS INDICATE A PROBLEM. I HAVE BEEN QUITE DISTURBED THAT THE VEHICLE BECAME DISABLED BEFORE I WAS AWARE OF ANY PROBLEM. I HAVE TAKEN MY VEHICLE IN FOR REGULAR MAINTENANCE AT MY GMC DEALERSHIP AND WOULD LIKE AN EXPLANATION REGARDING THE FAILURE TO IDENTIFY THIS PROBLEM THROUGH THE REGULAR MAINTENANCE CHECKS....

AS I WAS DRIVING DOWN THE ROAD AT 55 MPH HOUR MY SUV BEGAN TO SHAKE EXTREMELY AND WAS THROTTLING AT VERY HIGH RPM'S AND THE SUV THRASH TO SUDDEN HALT AND CONTINUED TO SHAKE AND IDLE VERY HIGH AND LOUD. I TRIED TO HIT THE GAS TO GET MYSELF OFF THE ROAD AS I WAS ON A 2 LANE HIGHWAY WITH MY 4 YEAR OLD SON IN THE CAR, AND THE ENGINE REVVED AND THE RPM'S SPIKED BUT I WENT NOT MORE THAN 15 MPH, AT THE SAME TIME THE FOLLOWING ERRORS APPEARED ON MY SCREEN: 1) SERVICE STABAILI TRAK 2) ENGINE POWER IS REDUCED SLOWLY I WAS ABLE TO SAFELY GET THE CAR UP TO 35 MPH AND GET US HOME SAFE. I DID SOME RESEARCH AND SEEMS THAT THIS IS A VERY WELL KNOWN ISSUE WITH GMC SO I CONTACTED GMC AND WAS BASICALLY GIVEN THE RUNAROUND....

PCV SYSTEM FROZE...AIR CLEANER HAS WATER IN IT// REAR MAIN SEAL PUSHED OUT DUE TO EXCESSIVE CRANKCASE PRESSURE. #14882 SPECIAL COVERAGE ADJUSTMENT COVERS EXACT ISSUE HOWEVER MY VIN IS NOT INCLUDED. REQUESTING MY VIN BE ADDED TO #14882 SPECIAL ADJUSTMENT AS IT APPLIES TO MY EXACT MAKE/MODEL/YEAR AND ISSUE.

ON JAN 1ST IT WAS 3F OUT MY WIFE WORMED UP HER TERRAIN WE DROVE IT APPROXIMATELY 12 MILES WHEN WE STARTED TO SMELL SOMETHING BURNING. NEXT CAME THE ENGINE KNOCKING REALLY BAD. WE STOPPED THE TERRAIN AND HAD IT TOWED TO THE DEALERSHIP FOUND OUT THE REAR MAIN SEAL BLEW WITH SUCH FORCE THAT THE OIL COVERED THE MUFFLER. THIS HAPPENED FROM THE PCV BEING PLUGGED AND/OR FROZEN FROM THE COLD WEATHER. I RECENTLY FOUND A SERVICE BULLETIN FOR THAT YEAR MAKE AND MODEL THAT INDICATES THAT WILL HAPPEN AND THERE IS A SPECIAL COVERAGE FOR THAT.(14882: SPECIAL COVERAGE ADJUSTMENT) I ALSO RECEIVED A LETTER FROM GMC ABOUT HIGH OIL CONSUMPTION WARRANTY. THE TERRAIN MAY EXHIBIT ENGINE OIL CONSUMPTION. THAT IS ALSO A PART OF THAT 14882:ADJUSTMENT NOW TO THE POINT I WAS TOLD THAT THIS ISSUE MY WIFE'S TERRAIN WOULD BE COVERED UNDER THE 100K/5YEAR POWER TRAIN WARRANTY...

VEHICLE WAS STARTED AFTER SITTING IN A PARKING LOT FOR 8 HOURS WHILE I WAS AT WORK. SEASON WAS WINTER. VEHICLE NOTED TO BE RUNNING ROUGH, BARELY DRIVEABLE, CHECK ENGINE LIGHT ON.

TIMING BELT STRETCHED AND JUMPED. CYLINDER HEAD BROKEN. TIMING BELT JUMPED WHILE DRIVING, BEGAN MAKING A VERY LOUD RATTLING NOISE.

TIMING CHAIN JUMPING OFF OF SPROCKETS AND EATING AWAY AT THE CHAIN GUIDES AND TENSIONERS.

TL* THE CONTACT OWNS A 2012 GMC TERRAIN. THE CONTACT STATED THAT WHILE DRIVING AT VARIOUS SPEEDS, THE VEHICLE SUDDENLY LOST ACCELERATION POWER. THE CONTACT ALSO STATED THAT WHILE AT A STOP THE ENGINE STALLED. THE FAILURE OCCURRED ON TWO DIFFERENT OCCASIONS. THE VEHICLE WAS TOWED TO THE DEALER BOTH THE TIMES WHERE IT WAS DIAGNOSED THAT THE ENTIRE ENGINE AND THE TRANSMISSION NEEDED TO BE REPLACED. THE CONTACT STATED THAT ONLY THE ENGINE WAS REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 106,122.

OIL CONSUMPTION ISSUE: I REALIZED ABOUT 3 MONTHS AGO THAT MY CAR ENGINE WOULD SHAKE A BIT ON START UP AND DURING IDLE. I TOOK IT INTO THE DEALERSHIP FOR A DIAGNOSTIC TEST AND WAS TOLD THAT THERE WAS VERY LITTLE OIL IN THE CAR AND THAT IT WAS BURNT. I WAS VERY SURPRISED BECAUSE I HAVE NEVER HAD AN ISSUE LIKE THIS BEFORE. SO WE GOT AN OIL CHANGE AND THAT WAS THAT. ENGINE STILL SHOOK ON IDLE AND DURING STARTUP. 5000 MILES LATER I REALIZE THAT IT IS TIME FOR AN OIL CHANGE AND CHECK THE DIP STICK AND FIND THAT NOTHING APPEARS ON IT, INDICATING THAT IT IS SHORT AT LEAST 1.25 QUARTS. I FILL IT UP WITH 0.5 QUARTS AND STILL NOTHING ON THE DIP STICK. I HAVE LOOKED ONLINE AND SEEN THAT MANY OTHERS HAVE HAD THIS ISSUE OF OIL CONSUMPTION WITH 2010-2013 TERRAINS AND...

TL* THE CONTACT OWNS A 2012 GMC TERRAIN. WHILE DRIVING VARIOUS SPEEDS, THE VEHICLE STALLED WITHOUT WARNING. THE VEHICLE WAS BROUGHT TO THE DEALER FOR DIAGNOSTIC TESTING, BUT THE DETAILS COULD NOT BE PROVIDED. THE VEHICLE WAS REPAIRED; HOWEVER, THE FAILURE RECURRED. WHILE DRIVING AT VARIOUS SPEEDS, THE VEHICLE BEGAN TO JERK AND HESITATE AND A LOUD ABNORMAL KNOCKING NOISE WAS HEARD. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE VEHICLE WAS IN WORKING CONDITION. THE CONTACT STATED THAT THE ENGINE FAILED SHORTLY AFTER, MAKING THE VEHICLE INOPERABLE. THE MANUFACTURER WAS MADE AWARE OF THE FAILURES. THE FAILURE MILEAGE WAS 135,000.

THE VEHICLE HAS BEEN IN THE SHOP FOR 10 TO 12 TIMES DUE TO FAILURE WITH THE ENGINE MISFIRING AS WELL AS TRACTION CONTROL LIGHTS AND STABILITY TRAC AS WELL AS TRANSMISSION NOT SHIFTING RIGHT AND LOSS OF POWER WHILE DRIVING ON MAJOR HIGHWAYS AND BROUGHT INTO THE DEALERSHIP WHERE THEY TELL ME THEY CAN FIND OR MAKE THE PROBLEM REAPPEAR. BUT HAVE SHOWN THE DEALERSHIP SERVICE DEPARTMENT VIDEO AND HAVE HAD 3 GENERAL MOTOR TECHS THAT THEY HIRED FROM HP AND BEEN TOLD THE VEHICLE IS SAFE AND THAT THERE WILL BE NO MORE PROBLEMS BUT HAVE BEEN IN THE VEHICLE WHILE THE PROBLEMS HAVE HAPPENED AND HAVE IT ON VIDEO TO THE POINT WHERE I ALMOST LOST MY LIFE YESTERDAY NIGHT. THE VEHICLE IS A DEATH TRAP AND MANY CUSTOMERS INCLUDING MYSELF ON GMC TERRAIN FORUM AS WELL AS ONLINE HAVE HAD THE SAME PROBLEM AND HAVE BEEN...

VEHICLE'S TRANSMISSION SLIPS AND DOES NOT RESPOND TO AN ACCELERATION AFTER A RAPID DECELERATION OF AT LEAST 40 MPH. THE VEHICLE WILL JERK IN RESPONSE TO YOUR ATTEMPT TO ACCELERATE AND THEN WILL RESPOND. THIS CAN LEAD TO A DANGEROUS SITUATION IF YOU ARE ATTEMPTING TO AVOID A COLLISION BY ACCELERATING TO GET OUT OF THE WAY. *TR