70 of the 175 complaints filed about the Chevrolet Corvette Z06 are about the engine — 40% of everything owners reported. The worst model year for it is 2007.
70
Complaints
40%
Share of all complaints
1
Crashes
2
Fires
ENGINE
The contact owns a 2008 Chevrolet Corvette. The contact stated that while driving out of his driveway, the "Service Active Handling System" warning light was illuminated. Neither the dealer nor an independent mechanic was made aware of the failure. The vehicle was not diagnosed nor repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 75,600.
NHTSA complaint #11430514 — an unverified report by a vehicle owner.
ENGINE
2008 CORVETTE C6 Z06. CONSUMER WRITES IN REGARDS TO VALVE GUIDE MACHINING ISSUES. *LD
NHTSA complaint #11206698 — an unverified report by a vehicle owner.
ENGINE
LOUD TICKING COMING FROM VALVES, WORRIED TO DROP A VALVE WHEN DRIVING
NHTSA complaint #11163372 — an unverified report by a vehicle owner.
ENGINE
DEFECTIVE VALVE GUIDES. THIS FIRST HAPPENED AT 13,500 MILES, AND CHEVROLET DID REPLACE THE HEADS UNDER WARRANTY. NOW IT HAS HAPPENED AGAIN AT 28500 MILES AND I HAVE SPENT OVER $3100 IN PARTS ALONE TO FIX THE PROBLEM, WHICH HAS BEEN VERIFIED BY THE COMPANY WHO SOLD ME THE REPLACEMENT HEADS. I PROVIDED THE LABOR OR THE COST WOULD HAVE BEEN $1700 HIGHER. FOUR INTAKE VALVE GUIDES WERE BEYOND THE CHEVROLET REPLACEMENT SPEC AND ANOTHER FOUR WERE ALREADY AT THE CHEVROLET SERVICE LIMIT WITH ONLY 15000 MILES ON THE REPLACEMENT HEADS. OBVIOUSLY THE PROBLEM OCCURRED DURING CITY AND HIGHWAY DRIVING.
NHTSA complaint #11140731 — an unverified report by a vehicle owner.
ENGINE
THE HEAD ISSUE VALVE GUIDE ON THE HEADS WAS COMPLETELY OUT OF SPEC....HAVE REPAIRED CAR TWICE BECAUSE OF THIS ISSUE '.
NHTSA complaint #11110132 — an unverified report by a vehicle owner.
ENGINE
DANGEROUS CONDITIONS. EXHAUST VALVE DESIGN CAUSES EAR THAT EVENTUALLY BREAKS EXHAUST VALVE AND DESTROYS ENGINE. EXHAUST VALVE LOOSE ENOUGH TO BREAK AND CAUSE ENGINE DAMAGE, POSSIBLE FIRE AND/OR FLAMMABLE FLUID LEAKAGE. HTTPS://WWW.YOUTUBE.COM/WATCH?V=WTOA3VLGOES
NHTSA complaint #11081094 — an unverified report by a vehicle owner.
ENGINE
MY 10,000 MILE 2007 HEADS ARE AT AHP FOR REBUILDING. THEY REPORTED BACK THAT 1 EXHAUST AND 3 INTAKE GUIDES WERE WORN PAST THE SERVICE LIMIT. SEVERAL OTHERS WERE CLOSE OR AT THE LIMIT.
NHTSA complaint #11066896 — an unverified report by a vehicle owner.
ENGINE
'TAKATA RECALL' JUST BOUGHT A 2007 Z06 CORVETTE AND LATELY I'VE BEEN SEEING A LOT OF COMPLAINTS ABOUT THE VALVE STEMS BREAKING AND CAUSING CATASTROPHIC ENGINE FAILTURE CAUSING THE POWER STEERING AND BREAKS TO FAIL SO NOW I HAVE TO PAY 5000.00 + TO GET IT SERVICED AND EVERY 10K MILES DO THE SAME THING BECAUSE THE VALVE STEM AND GUIDES GET HOT AND START TO WIGGLE
NHTSA complaint #11048120 — an unverified report by a vehicle owner.
ENGINE
VALVE RATTLE, NOT DRIVING VEHICLE TO KEEP FROM DROPPING VALVE......COSTS $4K FOR REPAIR TO HEADS....31000 MILES... IF I DRIVE IT AND DROP VALVE, WILL COST $18K TO REPLACE ENGINE ASSEMBLY.....LONG TERM VALUE OF VEHICLE DECREASES WITH NON-MATCHING NUMBERS VEHICLE. ONE HELLUVA WAY TO TREAT CUSTOMERS THAT SPEND $85K ON A VEHICLE.
NHTSA complaint #11047669 — an unverified report by a vehicle owner.
ENGINE
AT 65MPH, DRIVING DOWN THE HIGHWAY, THE CAR MADE A HORRENDOUS LOUD CLATTERING SOUND AND THE MOTOR LOCKED UP. PULLED TO THE SIDE OF THE ROAD TO SEE OIL POURING OUT THE SIDE OF THE ENGINE BLOCK, WHERE THE VALVE WAS SPIT OUT - CAUSING A HUGE HOLE IN THE SIDE OF THE MOTOR
NHTSA complaint #11016375 — an unverified report by a vehicle owner.
ENGINE
I BOUGHT MY 2008 Z06 BACK IN DECEMBER 2016 WITH 27000 MILES ON IT. LOVE THE CAR BUT FROM I UNDERSTAND READING ABOUT THE COMPLAINS FROM OTHER OWNERS IT HAS VALVE PROBLEMS AND THE CAN GIVE AWAY AT ANY TIME. DEAR GM I DON'T CARE HOW YOU TAKE THIS, BUT SHOULD MY 2008 LS7 MOTOR BREAK DOWN DUE TO THIS SPECIFIC SITUATION YOU WILL FIX IT AT YOUR OWN COST, I AM PRINTING THE COMPLAINS FROM THE FORUM ABOUT THE LS7 MOTOR ISSUES, AND IF THAT EVER HAPPENS TO MY CAR AND YOU REFUSE TO FIX IT, TV STATIONS, RADIO STATIONS, AND NEWS PAPERS WILL KNOW ABOUT THIS. LET ME CLEAR THIS IS A STATEMENT I AM MAKING THANK YOU
NHTSA complaint #11015601 — an unverified report by a vehicle owner.
ENGINE
MY 2007 CHEVROLET CORVETTE Z06 DROPED A VALVE WHILE I WAS DRIVING HOME. I WAS ON A REGULAR 45MPH SPEED LIMIT ROAD IN TRAFFIC WHEN I REALIZED THE CAR WAS LOSING POWER AND QUICKLY PULLED ON THE SIDE OF THE ROAD BECAUSE THERE WERE CARS IN FRONT AND BEHIND ME. LUCKILY NOBODY WAS HURT BUT IF I HAD BEEN ON A HIGHWAY IN THE MIDDLE LANE SOMEONE COULD HAVE LOST THEIR LIFE INCLUDING ME. FROM THE SECOND I REALIZED THE CAR WAS LOSING POWER TO THE POINT THE ENGINE SHUT OFF WAS A MATTER OF 5 SECONDS MAYBE. AFTER DOING MUCH RESEARCH ONLINE I FOUND OUT THERE IS A VERY COMMON PROBLEM WITH VALVE GUIDES BEING OUT OF SPEC IN THIS MODEL CORVETTE.
NHTSA complaint #10992918 — an unverified report by a vehicle owner.
ENGINE
#1 AZDANZ06'S AVATARAZDANZ06 , 01-06-2015 11:27 AM LINK TO FILE COMPLAINT: HTTPS://WWW-ODI.NHTSA.DOT.GOV/VEHICL...NT/INDEX.XHTML I JUST FILED A COMPLAINT WITH THE NHTSA ABOUT THE OUT OF SPEC VALVE GUIDE ISSUE, I WOULD ENCOURAGE EVERYONE ELSE TO DO SO AS WELL, MAYBE JUST MAYBE IT WILL FORCE GM TO FINALLY DO A RECALL AND QC ON PARTS. HERE IS MY COMPLAINT: I WAS CONCERNED ABOUT EXCESSIVE VALVE TRAIN NOISE AND AFTER READING SEVERAL CORVETTE FORUM THREADS ABOUT IMPROPERLY MACHINED HEADS BY GM'S SUPPLIER LINAMAR, AND THAT NUMEROUS VEHICLES HAVE HAD VALVES DROP AND RUIN THE ENGINES, 88% OF THE CORVETTE FORUM MEMBERS WHO HAVE HAD THEIR CYLINDER HEADS TESTED FOR EXCESSIVE VALVE GUIDE WEAR, WERE OUT OF SERVICE SPECIFICATIONS. SOURCE: HTTPS://WWW.CORVETTEFORUM.COM/FORUMS...-REGISTRY.HTML GM NEEDS TO ISSUE A RECALL ON THIS ISSUE, THERE HAVE BEEN NUMEROUS ENGINE FAILURES AS A RESULT OF A DROPPED VALVE INTO A CYLINDER WHICH CAN CAUSE ACCIDENTS AND FIRES. GM IS VERY AWARE OF THIS ISSUE, BUT REFUSES TO DO ANYTHING ABOUT THIS HUGE SAFETY RISK TO DRIVERS, PASSENGERS, AND NEARBY VEHICLES IF THE ENGINE FAILS GOING DOWN THE ROAD. #2 WHIS9'S AVATARWHIS9 , 01-06-2015 11:39 AM
NHTSA complaint #10992459 — an unverified report by a vehicle owner.
ENGINE
VALVE BROKE AND LOCKED UP ENGINE. CAR SKIDDED OFF HIGHWAY AND WAS DESTROYED. I WAS DRIVING ON INTERSTATE AND IT WAS RAINING. NO INDICATION OF PROBLEM BEFORE EVENT
NHTSA complaint #10983504 — an unverified report by a vehicle owner.
ENGINE
ENGINE IS MAKING A LOUD TICKING NOISE. SHOP RECOMMENDED TO REPLACE VALVE GUIDES AND REMACHINE CYLINDER HEADS. THIS IS TO PREVENT A VALVE DROPPING INTO THE ENGINE DUE TO OUT OF SPEC CYLINDER HEADS FROM THE OEM SUPPLIER. THIS IS A HIGH OCCURRENCE PROBLEM THAT HAS LOW OR REMOTE DETECTION METHODS. THE SEVERITY PRESENTS A POTENTIAL SAFETY/FIRE HAZARD.
NHTSA complaint #10966623 — an unverified report by a vehicle owner.
ENGINE
I RECENTLY HAD MY VALVES TESTED BY A LOCAL SHOP SINCE IVE HEARD FROM OTHER OWNERS THAT THE LS7 VALVES DROP AT ANY GIVEN TIME. I HAD TWO VALVES OUT OF SPECS AND HAVE TO GET IT FIXED IN ORDER TO SAVE ENGINE FROM FUTURE DAMAGE. MY CAR CURRENTLY HAS 52,241 MILES.
NHTSA complaint #10954824 — an unverified report by a vehicle owner.
ENGINE
I WAS CONCERNED ABOUT EXCESSIVE VALVE TRAIN NOISE AND AFTER READING SEVERAL CORVETTE FORUM THREADS ABOUT IMPROPERLY MACHINED HEADS BY GM'S SUPPLIER LINAMAR, AND THAT NUMEROUS VEHICLES HAVE HAD VALVES DROP AND RUIN THE ENGINES, I TOOK MY CAR WITH 9500 MILES ON IT TO A CORVETTE SPECIALTY SHOP TO HAVE MY VALVE GUIDE CLEARANCE TESTED. I HAD (2) INTAKE VALVE GUIDES OUTSIDE OF SERVICE SPECIFICATIONS, (4) EXHAUST VALVE GUIDES OUTSIDE OF SERVICE SPECIFICATIONS, AND A COMBINATION OF (10) OTHER INTAKE AND EXHAUST VALVE GUIDES AT OR NEAR THE MAXIMUM OUTSIDE OF SERVICE SPECIFICATIONS. THE CAR IS BEING REPAIRED WITH PROPER RE-MACHINING OF THE HEADS TO MAKE THE VALVE GUIDES CONCENTRIC, NEW INTAKE AND EXHAUST VALVE GUIDES INSTALLED, AS WELL AS NEW SEALS, VALVES, SPRINGS, ETC. 88% OF THE CORVETTE FORUM MEMBERS WHO HAVE HAD THEIR CYLINDER HEADS TESTED FOR EXCESSIVE VALVE GUIDE WEAR, WERE OUT OF SERVICE SPECIFICATIONS. SOURCE: HTTP://WWW.CORVETTEFORUM.COM/FORUMS/...-REGISTRY.HTML GM NEEDS TO ISSUE A RECALL ON THIS ISSUE, THERE HAVE BEEN NUMEROUS ENGINE FAILURES AS A RESULT OF A DROPPED VALVE INTO A CYLINDER WHICH CAN CAUSE ACCIDENTS AND FIRES. GM IS VERY AWARE OF THIS ISSUE, BUT REFUSES TO DO ANYTHING ABOUT THIS HUGE SAFETY RISK TO DRIVERS, PASSENGERS, AND NEARBY VEHICLES IF THE ENGINE FAILS GOING DOWN THE ROAD.
NHTSA complaint #10950230 — an unverified report by a vehicle owner.
ENGINE
THE 7L 427 ENGINE HAS A VALVE FAILURE PROBLEM. THE VALVE HEADS BREAK OFF INSIDE THE ENGINE WHILE RUNNING. THIS HAPPENED TO ME AS I WAS DRIVING ALONG A HIGHWAY AT 60 MILES PER HOUR NOT ACCELERATING BRAKING OR TURNING, IN A VERY REMOTE PART OF TEXAS. THE ENGINE SEIZED UP. THIS IS A KNOWN ISSUE BY GM WITH A MUCH HIGHER THAN EXPECTED FAILURE RATE YET HAS NEVER HAD A SERVICE BULLETIN NOR RECALL. THE CAR HAD 18,000 MILES ON IT AT THE TIME AND HAD NEVER BEEN TO THE TRACK OR ABUSED IN ANY WAY. OIL WAS CHANGED AT 3,000 MILE INTERVALS BY A CERTIFIED SHOP. BETWEEN TOWING AND REPAIR THE TOTAL BILL WAS OVER $ 16,000. BECAUSE THE CAR HAD BEEN IN SERVICE OVER 5 YEARS DESPITE THE LOW MILEAGE, GM PICKED UP ONLY 45% OF THE COSTS LEAVING ME WITH OVER A $ 10,000 BILL. THIS IS A HIGH PERFORMANCE VERY EXPENSIVE SPORTS CAR THAT HAD A COMPLETE ENGINE FAILURE AT 18,000 MILES.
NHTSA complaint #10919334 — an unverified report by a vehicle owner.
ENGINE
YES ,WHEN DRIVING THE CORVETTE ON THE HIGHWAY AND THE ENGINE BLEW UP AND QUIT WORKING EVERYTHING POTENTIALLY CAUSING AN ACCIDENT TO ME AT THAT TIME I WAS VERY SCARED.........THE VALVE DROPPED THROUGH THE 8TH CYLINDER,WHILE DRIVING ALMOST CAUSING DRIVERS TO CRASH.
NHTSA complaint #10919721 — an unverified report by a vehicle owner.
ENGINE
I HAD A FRIEND WHO HAD AN ENGINE FAILURE ON THIS SAME ENGINE DUE TO A FAILED EXHAUST VALVE. THE VALVE GUIDES WERE EXTREMELY WORN ON HIS CAR CAUSING THE VALVE FAILURE. DUE TO HIS FAILURE AND MANY OTHERS LIKE IT, I REMOVED MY HEADS AND INSPECTED. SURE ENOUGH, THEY WERE SIGNIFICANTLY BEYOND GENERAL MOTORS PUBLISHED TOLERANCES AND REQUIRED MACHINING TO REPAIR. THIS WAS AT SIGNIFICANT COST TO ME AND OUT OF POCKET. GM KNOWS OF THIS ISSUE AND REFUSES TO PARTICIPATE IN REPAIR COSTS FOR CARS OUT OF WARRANTY EVEN THOUGH IT'S A DESIGN FLAW AND SAFETY CONCERN. IF AND WHEN THE VALVE CATASTROPHICALLY FAILS, THE ENGINE WILL HAVE A COMPLETE SHUT DOWN, LARGE AMOUNTS OF SMOKE OUT THE EXHAUST CLOUDING THE OTHER DRIVERS VISION, AND HAS THE POSSIBILITY OF LEAVING OIL SLICKS ON THE ROAD SURFACE.
NHTSA complaint #10919211 — an unverified report by a vehicle owner.