There are 50 owner-reported speed control & cruise complaints for the 2008 Chevrolet Impalain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
ON INTERSTATE DRIVING APPROX. 60 MPH SUDDENLY CHECK ENGINE LIGHT CAME ON, AND REDUCE ENGINE SPEED LIGHT ON AND CAR DROPPED DRASTICALLY DOWN TO LITERALLY NO POWER. BARELY HAD TIME TO GET ON SHOULDER WITHOUT CAUSING ACCIDENT. WENT TO LOCAL MECHANIC AND HE SAID THAT THE ISSUE WAS THE THROTTLE PEDDLE.
WHILE DRIVING ON HIGHWAY MY CAR WILL REDUCE ENGINE SPEED IT WILL DROP FROM 65MPH TO 20MPH SOMETIMES IT SHUTS CLEAR DOWN . I HAVE SO FAR ALMOST BEEN IN TWO COLLISIONS BECAUSE OF THIS.
DRIVING ON HIGHWAY @ 60 MPH WHEN ENGINE DIES WITH NO WARNING. DASH SHOWS FOLLOWING MESSAGES: "ENGINE POWER REDUCED" "SERIVCE TRACTION CONTROL" "SERVICE STABILITRAX" POWER STEERING AND POWER BRAKES STOP WORKING. WHEN CAR KEY IS TURNED OFF AND CHECK ENGINE CODES ARE CLEARED, THE CAR STARTS UP FINE AND CONTINUES TO RUN SMOOTHLY. LUCKILY I WAS ABLE TO SAFELY STOP THE CAR (ALBEIT ON THE MIDDLE OF A MAJOR HIGHWAY), TURN IT OFF, CLEAR THE CODES, AND START IT BACK UP TO GET OUT OF THE WAY. SAME PROBLEM HAPPENED IN JANUARY 2018. AFTER THIS I TOOK IT TO A CHEVY DEALER. THEY SAID CAR WAS COVERED UNDER "WARRANTY" FOR THIS PROBLEM AND THEY REPLACED THE THROTTLE BODY. ONE MONTH LATER SAME PROBLEM KEEPS OCCURRING. CAR RUNS FINE BUT THESE MESSAGES APPEAR ABOUT ONCE A MONTH. TYPICALLY THE ENGINE STAYS ON AND IS ONLY LIMITED IN POWER. HOWEVER, OCCASIONALLY THE CAR WILL DIE COMPLETELY WITHOUT WARNING, EVEN ON THE HIGHWAY. HAD CAR BROUGHT TO CHEVY DEALER. THEY SAID THEY CAN NOT FIX THE PROBLEM UNLESS IT IS CURRENTLY OCCURRING WITH THE CAR. THEY RECOMMENDED I TAKE THE CAR AND BRING IT BACK TO THEM WHEN THE PROBLEM HAPPENS AGAIN. HOWEVER, I DO NOT FEEL SAFE DRIVING THIS CAR KNOWING THE ENGINE COULD JUST SHUT DOWN AT ANY MOMENT AND THE CHEVY SPECIALIST THEMSELVES DO NOT SEEM TO EVEN HAVE A CLUE ABOUT WHAT COULD BE CAUSING THIS.
TL* THE CONTACT OWNS A 2008 CHEVROLET IMPALA. WHILE DRIVING 60 MPH, THE REDUCED ENGINE POWER AND THE SERVICE STABILITY CONTROL INDICATORS ILLUMINATED AS THE VEHICLE DECELERATED. STATEN ISLAND BUICK GMC (1855 HYLAN BLVD, STATEN ISLAND, NY 10305) DIAGNOSED THAT SENSORS T2135: (THROTTLE BODY) AND P2138: (ACCELERATOR PEDAL ACTUATOR) FAILED AND NEEDED REPLACEMENT. THE VEHICLE WAS REPAIRED. THE MANUFACTURER OFFERED TO ASSIST WITH THE REPLACEMENT OF THE THROTTLE BODY, BUT NOT THE ACCELERATOR PEDAL. THE FAILURE MILEAGE WAS 59,502.
TL* THE CONTACT OWNS A 2008 CHEVROLET IMPALA. WHILE DRIVING 70 MPH, THE ENGINE POWER REDUCED WARNING INDICATOR ILLUMINATED AND THE VEHICLE DECELERATED. THE CONTACT CONTINUED TO DEPRESS THE ACCELERATOR PEDAL, BUT THE VEHICLE FAILED TO ACCELERATE ABOVE 20 MPH. THE CONTACT STATED THAT THE VEHICLE WAS PREVIOUSLY DIAGNOSED BY AN INDEPENDENT MECHANIC WHO STATED THAT THE ACCELERATOR PEDAL AND AN UNKNOWN SENSOR FAILED AND NEEDED REPLACEMENT. THE VEHICLE WAS REPAIRED. THE VEHICLE WAS NOT TAKEN TO A DEALER FOR DIAGNOSTIC TESTING OR REPAIRS. THE MANUFACTURER WAS NOTIFIED AND INFORMED THE CONTACT THAT THEY WOULD START A CASE FILE AND SEND IT OVER TO THEIR TEAM. THE FAILURE MILEAGE WAS APPROXIMATELY 138,000.
I WAS DRIVING ON ICY AND SNOWY ROADS AND MY ENGINE POWER REDUCED WARNING LIGHT CAME ON. I DROVE SEVERAL MILES TO MY DESTINATION. MY CAR SAT FOR 6 HOURS. I GOT IN TO LEAVE AND THE ENGINE LIGHT WAS ON BUT NOT THE WARNING. AFTER DRIVING ABOUT TEN MILES MY ENGINE POWER REDUCED LIGHT CAME ON AGAIN. THIS HAPPENED MULTIPLE TIMES FOUR YEARS AGO AND IT'S VERY FRUSTRATING TO HAVE IT HAPPENING AGAIN. IT SEEMS TO OCCUR MORE FREQUENTLY WHEN THE ROADWAY IS WET. AFTER READING ONLINE, IT SEEMS THIS IS HAPPENING TO MANY OTHER CHEVROLET CARS ALSO.
FIRST, THE KEY WILL NOT COME OUT OF THE IGNITION WITHOUT PRESSING THE RELEASE KEY SWITCH LOCATED UNDER THE STEERING WHEEL. THEN THE CAR WON'T ACCELERATE OVER 20 MPH IN D WHILE DRIVING ANYWHERE, IT WON'T GO OVER 40 IN D3. NOT SURE WHY BUT THIS IS WHAT IS HAPPENING WITH THE IMPALA.
TL* THE CONTACT OWNS A 2008 CHEVROLET IMPALA. WHILE DRIVING 40 MPH, THE ENGINE REDUCED POWER INDICATOR ILLUMINATED AND THE VEHICLE BEGAN TO REDUCE IN SPEED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHO DIAGNOSED THAT THE THROTTLE POSITIONING SENSOR FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS CALLED AND INFORMED THE CONTACT THAT IF A DIAGNOSTIC FEE WAS PAID, THE VEHICLE COULD BE COVERED UNDER A TECHNICAL SERVICE BULLETIN. THE CONTACT STATED THAT HE DID NOT HAVE MONEY FOR A DIAGNOSTIC FEE. THE FAILURE MILEAGE WAS APPROXIMATELY 34,000.
STARTED THE CAR AND IMMEDIATELY UPON PULLING OUT OF PARKING LOT THE SERVICE TRACTION CONTROL ERROR MESSAGE AND REDUCED ENGINE POWER MESSAGES APPEARED. THIS IS THE 3RD TIME THIS HAS HAPPENED ON THIS CAR. HAVE ENTERED PROBLEM REPORTS FOR THE 1ST 2 OCCURRENCES ON THIS SITE. REPLACED ACCELERATOR PEDAL POSITION PEDAL SENSOR. NONE OF THESE 3 OCCURRENCES WERE COVERED UNDER WARRANTY. IT WAS 14 MONTHS SINCE THE LAST OCCURRENCE AND WARRANTY WAS FOR 12 MONTHS.
TAKATA RECALL. IT HAPPEN TO ME TWICE I GOT TWO KIDS THE CAR LOST POWER FROM 45 TO TEN. ENGINE LIGHT IS ON. THE CODE THST COMES UP IS P2138 THIS IS NOT OK NEEDS TO GET FIXED. FIRST TIME IT HAPPEN I WAS ON A HIGHWAY THE CAR BEHIND ME ALMOST HIT ME DUE TO THE ENGINE POWER LOSS.
TRACTION CONTROL AND THE STABILITY TRAC REDUCES THE ENGINE SPEED UNDER NORMAL WEATHER CONDITIONS DRASTICALLY WITHOUT ANY WARNINGS. BEEN ACTING UP FOR SOME TIME. DEALERS DON'T KNOW WHAT THE PROBLEM IS AND DOESN'T GIVE A CODE. VERY DANGEROUS AND FRUSTRATING.
WHILE DRIVING ANY SPEED, "REDUCED ENGINE POWER" LIGHT COMES ON. HAPPENED 3 TIMES AND THEN I RECEIVED A LETTER FROM GM TOOK TO DEALERSHIP FOR REPAIR. THEY REPAIRED THROTTLE BODY. CAR STILL ACTED THE SAME AFTER I GOT IT. DUE TO SNOW STORM I DIDN'T DRIVE IT A FEW DAYS. TWO WEEKS LATER, ENGINE POWER REDUCED STARTS AGAIN ON THE HIGHWAY GOING 70MPH (THIS HAS HAPPENED 6 TIMES ALTOGETHER) NOW GM ADVISED ME TO GO BACK TO DEALERSHIP FOR DIAGNOSTIC TEST. THEY CLAIM IT'S THE GAS PEDAL SENSOR ANS NOT COVERED. REPLACING THE THROTTLE BODY DID NOT ING TO FIX THE ISSUE AND MANY OTHERS HAVE HAS THIS SAME ISSUE. NOW GM REFUSES TO MAKE IT RIGHT AND I'M STUCK WITHOUT A VEHICLE BECAUSE I CAN'T AFFORD REPAIRS AND THE CAR IS WAY TOO DANGEROUS TO DRIVE.
TL* THE CONTACT OWNS A 2008 CHEVROLET IMPALA. THE CONTACT STATED THAT WHILE DRIVING AT 65 MPH, THE VEHICLE FAILED TO ACCELERATE WHEN THE ACCELERATOR PEDAL WAS DEPRESSED. A WARNING MESSAGE IN THE INSTRUMENT PANEL INDICATED THAT THE POWER WAS GREATLY REDUCED. THE FAILURE RECURRED INTERMITTENTLY. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHERE THE FAILURE WAS UNDETERMINED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 115,000. THE VIN WAS NOT AVAILABLE.
WHILE DRIVING MY CAR WILL NO LONGER REGISTER THE THROTTLE POSITION CAUSING THE ENGINE POWER TO REDUCE AND THE CAR TO DECELERATE (FROM ANY SPEED) THIS HAS HAPPENED BOTH AND STREETS AND HIGHWAYS. GM HAS ALREADY ISSUED AN "ADDITIONAL WARRANTY" FOR THE PROBLEM "THROTTLE POSITIONING SENSOR"
(REDUCED ENGINE POWER) MY 2008 CHEVY IMPALA RANDOMLY SHOWS DOWN AFTER THE DASH READS REDUCED ENGINE POWER. I AM LUCKY TO BE ALIVE I WAS DOING ABOUT 60 ON THE EXPRESSWAY AND THE CAR SPEED JUST DROPPED TO 20MPH I HAD TO SWERVE BECAUSE THE CAR BEHIND COULD NOT SLOW DOWN IN TIME. MY TWO YEAR OLD WAS IN THE CAR AND I HEAR THAT GM CARS HAVE THIS PROBLEM ALL THE TIME. THIS IS RIDICULOUSLY DANGEROUS SOMEONE HAS TO DO SOMETHING ABOUT IT. THE GM DEALERSHIP HAS NO IDEAL HOW TO FIX THIS.
TL* THE CONTACT OWNS A 2008 CHEVROLET IMPALA. WHILE DRIVING 65 MPH, THE ENGINE POWER REDUCED AND THE ENGINE LIGHT WARNING INDICATOR ILLUMINATED. THE VEHICLE INDEPENDENTLY DECELERATED TO 10 MPH AND FAILED TO ACCELERATE. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHERE IT WAS DIAGNOSED THAT THE THROTTLE BODY CONTROL MODULE NEEDED TO BE REPAIRED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 140,000.
TL* THE CONTACT OWNS A 2008 CHEVROLET IMPALA. THE CONTACT STATED THAT ON SEVERAL OCCASIONS WHILE DRIVING THE VEHICLE, THE REDUCED ENGINE POWER WARNING LIGHT ILLUMINATED. THE CONTACT STATED THAT WHEN THE ACCELERATOR PEDAL WAS DEPRESSED BUT THE VEHICLE FAILED TO RESPOND. THE FAILURE WAS INTERMITTENT. THE VEHICLE WAS TAKEN TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE THROTTLE POSITION SENSOR NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 140,000. UPDATED 02/18/16*LJ UPDATED 05/14/18*JB *CN
I WAS DRIVING ON INTERSTATE 81 IN CNY WHEN MY DASH LIT UP AND SAID "SERVICE TRACTION CONTROL, REDUCE ENGINE POWER" AT THAT POINT MY CAR WOULD NOT DOWN SHIFT TO ACCELERATE. ABOUT 15 MILES DOWN THE ROAD MY CAR SAID "SERVICE THROTTLE CONTROL SENSOR", AND THE ENGINE SHUT OFF!!! I WAS JUST COMING OUT OF A HUGE WORK ZONE AND I LOST POWER STEERING AND POWER BRAKES IN THE LEFT LANE OF A 3 LANE HIGHWAY. I MADE MY WAY TO THE SHOULDER AS SAFELY AS I COULD AND WAS UNABLE TO RESTART MY CAR FOR AT LEAST 5 MINUTES!!!!!! 3 DAYS LATER IT DID IT ALL OVER AGAIN ON A COUNTRY ROAD THANKFULLY!!. I REMEMBER THE REDUCE ENGINE POWER SERVICE TRACTION CONTROL HAD ACTED UP ONCE BEFORE IN 2012 RIGHT AFTER I BOUGHT THE CAR. THIS NEEDS TO BE RECALLED IMMEDIATELY BEFORE SOMEONES ENGINE SHUTS OFF WHEN THEY ARE GOING FASTER THAN 45!!!!!!
WHEN I STARTED MY VEHICLE, THE SERVICE TRACTION CONTROL MESSAGE APPEARED. ALSO, THE CHECK ENGINE LIGHT AND REDUCED ENGINE POWER MESSAGE. DURING MY DRIVE TO WORK I COULD NOT GO BEYOND 40MPH OR 2RPM. *JS
DRIVING 40MPH CHECK ENGINE LIGHT CAME ON THEN REDUCED ENGINE POWER FLASHED ON MESSAGE BOARD SEVERAL SECONDS LATER TRACTION CONTROL LIGHT CAME ON AND SERVICE TRACTION CONTROL CAME ON MESSAGE BOARD. MY SPEED WAS REDUCED TO 20MPH IN TRAFFIC! LUCKILY I WAS ABLE TO PULL OVER SAFELY WITHOUT CAUSING ANY ACCIDENT (FYI I HAD MY DAUGHTER IN THR CAR WITH ME). I WILL BE TAKING THE CAR TO A CHEVY SHOP IN THE MORNING WHERE IM SURE I WILL HAVE TO PAY HIGH COST OUT OF POCKET EVEN THOUGH THIS HAS BEEN AN ISSUE FOR CHEVY OWNERS (ONLINE SEARCH) AND THERE HAS BEEN MANY COMPLAINTS WITH NO RECALL. THIS IS A SERIOUS ISSUE AND I FEEL IT IS PUTTING MANY LIVES IN DANGER AND SHOULD HAVE BEEN A RECALL A LONG TIME AGO. IM JUST LUCKY I WASN'T ON THE HIGHWAY YET BECAUSE THIS COULD HAVE TURNED FATAL. *TR
Showing 1–20 of 50 complaints
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026