2007 Chevrolet Trailblazer Powertrain & Transmission Problems

TRANSMISSION HARD SHIFTING, SLOW TORQUE CONVERTER CLUTCH LOCK UP AND HARD LOCK UP WHEN IT DOES. GOING DOWN A HILL THE TORQUE CONVERTER WILL UNLOCK WHEN LETTING OFF THE GAS AND WHEN STARTING UP ANOTHER HILL THE ENGINE WILL SPEED UP AND THEN IT WILL RE-LOCK WITH A JERK. LOWER GEAR SHIFTS HARD SOMETIMES AND SOMETIMES OK.

TL* THE CONTACT OWNS A 2007 CHEVROLET TRAILBLAZER. AFTER MAKING CONTACT WITH THE SHIFTER AND PUSHING IT FORWARD, THE GEAR SHIFTER INADVERTENTLY SWITCHED FROM THE DRIVE POSITION TO THE NEUTRAL POSITION. THE FAILURE OCCURRED WHILE DRIVING 30 MPH. WHILE IN THE NEUTRAL POSITION, THE VEHICLE BEGAN TO LOSE POWER AND ACCELERATION. THE CONTACT INDICATED THAT THE SHIFTER WOULD SHIFT FROM DRIVE TO NEUTRAL WITHOUT HAVING TO PRESS THE BUTTON ON THE SHIFTER. DURING THE FAILURE, THE SHIFT SELECTOR INDICATOR DISPLAYED THAT THE VEHICLE WAS STILL IN THE DRIVE POSITION. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS 80,000.

BOTH TRANSMISSION COOLER LINES WERE HEAVILY CORRODED AND CAUSED A LEAK. THERE IS A TSB FOR CERTAIN MODEL YEARS AND ALOT OF COMPLAINTS ONLINE. TSB #PIT-4722 -- GMC: FLUID LEAK FROM TRANSMISSION OIL COOLER LINES DUE TO CORROSION. ALL 2000-2006 LIGHT DUTY TRUCKS EQUIPPED WITH THE LIGHT DUTY AUTOMATIC TRANSMISSION. *PE (NHTSA ID #10026804, OCTOBER 01 2008) . *TR

I WAS DRIVING MY 2007 TRAILBLAZER HOME AFTER A 150 MILE TRIP TO COLUMBUS AND NOTICED OIL SPOTS ON MY DRIVEWAY. I MOVED AND PARKED THE VEHICLE IN ANOTHER LOCATION WHERE A LARGE PUDDLE OF "OIL." FELL UNDER THE ENGINE. I CLIMBED UNDERNEATH AND SAW TRANSMISSION FLUID DRIPPING FROM THE FRAME ONTO THE GROUND. I CALLED GRAHAM CHEVROLET AND WAS TOLD NOT TO DRIVE AS IT WOULD CAUSE SEVERE DAMAGE TO THE TRANSMISSION RESULTING IN A COSTLY REPAIR OR REPLACEMENT. I CALLED AAA AND HAD THE VEHICLE TOWED ON A FLATBED TRUCK TO GRAHAM CHEVROLET WHERE THEY REPLACED THE CORRODED AND LEAKING TRANSMISSION LINES WITH A BILL OF OVER $500.00 FOR THE WORK DONE. THEY SAID GM KNOWS OF THE PROBLEM AND IT IS COMMON TO THESES VEHICLES, BUT NO RECALL OR WARRANTY REPAIR WAS AUTHORIZED. IT WAS THE CUSTOMERS PROBLEM TO TAKE CARE OF. I HAVE SINCE FOUND OTHERS WITH THE SAME ISSUE AND ALSO DID AN INTERNET SEARCH SHOWING MANY TRAILBLAZERS WITH THIS PROBLEM. MY COMPLAINT IS THAT THE VEHICLE WAS DESIGNED AND BUILT WITH A DEFECTIVE TRANSMISSION COOLER LINE MATERIAL SUBJECT TO CORROSION AND FAILURE OVER TIME. GM AND CHEVROLET SHOULD BE RESPONSIBLE FOR THIS REPAIR AND ISSUE A CALLBACK TO PREVENT ANY POTENTIAL ACCIDENTS OR INJURIES DUE TO THIS FAILURE. *TR

FLUID LEAK FROM TRANSMISSION OIL COOLER LINES DUE TO CORROSION. *TR

WAS DRIVING DOWN THE ROAD TRANSMISSION STARTED TO SLIP PULLED OVER AND HAD TRANS FLUID EVERYWHERE. REPLACED THE LINES AND NOW NOT EVEN 3 YEARS LATER THEY ARE ROTTEN AGAIN AND WILL NEED REPLACED SOON. I AM LUCKY THE FIRST TIME THEY BROKE I DIDN'T DAMAGE MY TRANSMISSION. I HAVE SEEN WHERE A LOT OF OTHER PEOPLE HAVE AND ARE HAVING THE SAME PROBLEMS.IT COAST ME AROUND $150 FOR THE LINES AND THE FLUID AND FILTER TO MAKE SURE THERE WAS NO DAMAGE. I CANT AFFORD $150 EVERY COUPLE YRS. *TR

TRANSMISSION FAILURE WITHOUT ANY NOTICE AT INTERSECTION ALMOST CAUSING ACCIDENT IN A 2007 CHEVY TRAILBLAZER SS. *TR

TRANSMISSION LINE BETWEEN RADIATOR AND TRANSMISSION RUSTED OUT. MY VEHICLE IS A 2007 CHEVROLET TRAILBLAZER WITH 59,000 MILES. *TR

I PURCHASED A BRAND NEW CHEVROLET TRAILBLAZER AT THE END OF 2007. SINCE THEN, I HAVE HAD MULTIPLE SERVICE ISSUES WITH THE CAR, MOST NOTABLY A FAULTY FRONT AXLE THAT HAD TO BE REPLACED. IN JANUARY 2009, MY SERVICE 4WD LIGHT CAME ON AND I COULD NOT PUT MY CAR INTO 4WD. I IMMEDIATELY TOOK MY CAR TO THE DEALERSHIP, WHO COULD NOT FIND A PROBLEM AND RETURNED MY CAR TO ME. A WEEK LATER, I WAS DRIVING MY CAR IN THE SNOW IN 4WD, GETTING READY TO ENTER THE HIGHWAY, WHEN THE CAR STALLED AND THE SERVICE 4WD LIGHT CAME ON AGAIN. I RETURNED TO THE DEALERSHIP, WHO KEPT MY CAR FOR 3 DAYS AND AGAIN COULD NOT FIND THE PROBLEM. THEY RETURNED MY CAR TO ME AND SAID "YOU PROBABLY GOT SNOW IN YOUR MUFFLER". I DROVE MY CAR IN 4WD PERIODICALLY FOR THE NEXT 19 MONTHS TRUSTING THAT MY CAR WAS SAFE. WHEN THE SAME PROBLEM HAPPENED AGAIN AT THE END OF NOV 2010, I TOOK MY CAR TO A DIFFERENT DEALERSHIP WHO TOLD ME I HAD A BAD FRONT AXLE AND 5 BAD GEARS THAT WERE BINDING, AND THAT I COULD NOT DRIVE MY CAR IN 4WD UNTIL THIS WAS REPAIRED. I HAVE ALSO HAD TO HAVE AN O2 SENSOR REPLACED, SEVERAL BODY SYSTEM REPAIRS, AND YESTERDAY MY SERVICE STABILITRACK LIGHT CAME ON AND STAYED ON UNTIL I RESTARTED THE CAR. I HAVE ASKED CHEVY TO BUY BACK MY CAR, AS IT IS CLEAR I HAVE A POORLY MANUFACTURED AND UNSAFE VEHICLE, AND THEY HAVE ONLY OFFERED TO COVER MY BODY SYSTEMS PARTS UNDER WARRANTY. I FEEL UNSAFE IN MY CAR AND I DON' T KNOW WHERE TO TURN FOR HELP. *TR

2007 CHEVROLET TRAILBLAZER. *TR

I HAVE A PROBLEM WHERE THE THROTTLE HANGS UP AROUND 2000 RPM IN ALL GEARS AFTER BEING ON THE THROTTLE AND THEN IMMEDIATELY NEEDING TO SLOW DOWN FOR ANY REASON. THIS IS A TRAILBLAZER SUPER SPORT EQUIPPED WITH THE 395 HP 400 FT LB ENGINE. I HAVE BEEN TO THE DEALER. I HAVE SUED GM FOR THIS BEING A LEMON AND WAS PAID OFF. YET NO FIX. I HAVE VIDEO OF THIS HAPPENING. OTHER OWNERS HAVE THE SAME PROBLEM AND GM SAYS BECAUSE OTHERS DO IT THE VEHICLE IS ACTING AS DESIGNED. PER GEORGE VALEZ GM LEGAL OFFICE . GM SERVICE REQUEST # 71-661522934 "HIGH IDLE" I HAVE LOGS WHERE THE ACCELERATION TAKES PLACE FROM 9 MPH TO 11 MPH FOR 11 SECONDS OF A TBSS WILD RIDE WITH NO THROTTLE. I START BY DOWNSHIFTING IT IN MANUAL 1ST WHILE SLOWING DOWN. (BRAKES REQUIRED TO SLOW FROM 2K HANG UP RPM ON DOWN.) WHEN THE ENGINE IS SLOWING DOWN THERE IS A BUMP AT ~2000 RPM WHERE THE ENGINE SPEED RAISES ABOVE THE INPUT SHAFT SPEED OF THE TRANSMISSION. PRIOR TO THIS IT WAS TURNING SLOWER AND COMPRESSION BRAKING. TIME HERE IS 0 OF THE 11 SECONDS. I HIT THE BRAKES AT 14 MPH TO PULL THE SPEED DOWN FROM 2K RPM AND LET OFF AT 9MPH 3 SECONDS LATER. STARTING AT 1381 RPM FOR THE LOWEST ENGINE RPM, TRANS INPUT SHAFT 50 RPM SLOWER THEN THE ENGINE INDICATING ACCELERATION. AC CLUTCH JUST HAPPENS TO KICK IN HERE. "HERE WE GO!" I SAY. THE NEXT 8 SECONDS WE HAVE THE ENGINE HITS 1650 RPM AND HUNTS AROUND THIS RPM +- 75 RPM WHILE WE HIT 11 MPH. AT 8.4 SECONDS THE ENGINE CUTS BACK TO 1468 RPM. THIS IS WHEN THE TRANS INPUT SPEED IS FASTER THAN THE ENGINE RPM BY AROUND 50 - 70 RPM, THIS INDICATES ENGINE FINALLY SLOWING THE VEHICLE AGAIN. IT ONLY TAKES 5 SECONDS FROM THIS POINT TO SLOW DOWN FROM 11 MPH TO 5MPH WITHOUT ANY BRAKES. THAT IS WHAT IS SCARY - 16 SECONDS OF FIGHTING THE ENGINE WHEN IT COULD HAVE STAYED CUT OUT AND SLOWED DOWN IN LESS THAN 5 SECONDS FROM 2K RPM. THE AC IN THIS EXAMPLE MAKES THE PROBLEM WORSE, BUT ISN'T 100% OF THE PROBLEM. *TR UPDATED IVOQ/ 09/10/09

TRANSMISSION WENT OUT AFTER DRIVING IT FOR ONLY 2 DAYS AFTER PURCHASE. VEHICLE. HAD 15 MILES AT PURCHASE; TOWED IN WITH 95 MILES. VEHICLE HAD NO POWER IN REVERSE NOR DRIVE. GM ONLY OFFERED TO REPAIR OR REPLACE THE TRANS. WOULD NOT REPLACE VEHICLE OR GIVE MONEY BACK. THEY PLACED A REBUILT. TRANS IN A NEW CAR AND SINCE THEN THE VEHICLE. HAS BEEN GIVING ME PROBLEMS. DOES NOT ACCELERATE AS PRIOR TO FIX; HESITATES WHEN ACCELERATING FEELING LIKE IT'S READY TO STALL. GAS PEDAL STICKS AT TIMES; GIVING VEHICLE. GAS WHEN I'M NOT PRESSING ON THE PEDAL. THESE ARE MAJOR SAFETY ISSUES. THE SELLING DEALER SERVICE DEPT TOOK ONE DAY AND 8 MILE TEST DRIVE TO SAY THEY COULDN'T FIND NOTHING WRONG WITH THE CAR. WILLING TO LEAVE VEHICLE. FOR 3 DAYS, DEALER WOULD NOT WRITE IT UP. *CN

WHILE ACCELERATING ONTO A MAJOR ROADWAY, MY VEHICLE COMPLETELY LOST POWER. AS THE SPEED LIMIT WAS 55MPH, I HAD TO CROSS MY FINGER AND PICK A SPOT TO MANEUVER THE VEHICLE OFF THE ROADWAY AND HOPE THAT IT HAD ENOUGH MOMENTUM TO DO SO. MY VEHICLE IS STILL IN THE SHOP HOWEVER ANECDOTAL EVIDENCE FROM THE INTERNET FINDS THAT THE 4L60 AND 4L70 ARE RIFE WITH FAILURES THAT RESULT IN COMPLETE LOSS OF POWER OF THE VEHICLE. THE FAULTY PART SEEMS TO BE THE "SUN SHELL" AND HAS FAULTS ACROSS THE GM LINEUP. I'M VERY SURPRISED THEY HAVE NOT BEEN FORCED TO RECALL THIS DEFECTIVE TRANSMISSION. *TR

MY 2007 TRAILBLAZER LOST POWER DURING ACCELERATION. ON JANUARY 22 I TOOK IT TO THE DEALER AND IT TOOK THEM 4 DAYS FOR THE VEHICLE TO ACT UP SO THEY COULD GET A CODE. THEY REPLACED THE POWERTRAIN CONTROL MODULE. ON MARCH 3, 2010 IT HAPPENED AGAIN, THE SAME EXACT PROBLEM, WHILE MY WIFE WAS CROSSING A STREET. THE RPMS WENT FROM 2000 OR SO DOWN TO 5-600 WHILE PUSHING THE GAS PEDAL. I HAD THE TRUCK TOWED IN TO DEALER AND GOT A LOANER CAR UNDER TERMS OF MY WARRANTY. IT IS NOW DAY 6 AND THEY CANNOT GET IT TO ACT UP AGAIN. I CALLED GM CUSTOMER SERVICE HOTLINE AND GOT A CASE # 71-810026931, BUT I AM BEING TOLD BEFORE THEY SEND A TECHNICIAN THAT CAN SOLVE THE PROBLEM I MUST TAKE IT TO A SECOND DEALERSHIP AT MY COST AS WELL AS PAYING FOR TOWING AND LONER CAR FOR THE FIRST DEALERSHIP TO RELEASE THE TRUCK. THEY TOLD ME TO DRIVE IT UNTIL IT MESSES UP THEN GOTO THE DEALER TO GET CODE. THE SAFETY ISSUE IS WHAT HAPPENS TO MY FAMILY IF IT ACTS UP IN THE MIDDLE OF A TURN WITH TRAFFIC COMING. THERE IS OBVIOUSLY A PROBLEM THAT THE COMPUTER ISN'T RECOGNIZING. AND BECAUSE OF THAT MY FAMILY HAS TO BE THE GUINEA PIGS BEFORE GM WILL SEND A TECHNICIAN TO SOLVE THE PROBLEM. MY LOCAL MECHANIC SEEN THE PROBLEM, THE DEALERSHIP SEEN THE PROBLEM AND THOUGHT THEY FIXED IT. WHAT THEY DID WAS PUT A BANDAID ON A CUT THAT REQUIRES STITCHES. I HAVE TO PUT MY FAMILY IN JEOPARDY AND THAT OF WHOEVER HITS ME SO GM CAN SAVE MONEY AND NOT SEND THE TECHNICIAN. THE SAME PROBLEM IN JUST OVER A MONTH, FROM LOSING POWER TO THE DEALERSHIP HAVING PROBLEMS DIAGNOSING IT SHOULD SEND UP A RED FLAG THAT SOMETHING IS WRONG AND LIVES ARE IN DANGER. BUT THAT DOES NOT SEEM TO BE THE CONCERN EXCEPT FROM ME. SO I HAVE TO PAY FOR A TRUCK THAT IM AFRAID TO DRIVE SO GM DOESN'T LOSE MONEY SENDING OUT A TECHNICIAN WHEN THEY SHOULD BE WORRIED ABOUT A PROBLEM WITH A TRUCK THAT COULD COST SOMEONE THEIR LIFE. *TR