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definitely annoying
Crashes / Fires:
0 / 2
Injuries / Deaths:
0 / 0
Average Mileage:
34,574 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2006 Chevrolet Corvette engine problems

engine problem

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2006 Chevrolet Corvette Owner Comments (Page 1 of 2)

problem #27

Jan 012014

Corvette 8-cyl

  • 55,000 miles


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.

- Mason, OH, USA

problem #26

Jul 012016


  • miles
The cylinder heads have valves that are out of spec with 23,000 miles. The car is out of warranty due to age, and I was forced to purchase aftermarket cylinders heads to fix the worn valve issue to insure I don't drop a valve and have a catastrophic engine failure.

- Southaven, MS, USA

problem #25

Jun 202016


  • 12,000 miles
Z06 7.0L engine valve guides out of spec after 12K miles. This is due to a manufacturer defect in machining and or materials. Failure of the guides results in dropping a valve and catastrophic engine damage. As a catastrophic failure often causes the rear wheels to lock and/or the engine to oil down the road and possibly the rear tires which could lead to an accident or injury to others. This is an extreme safety concern.

- Savannah, GA, USA

problem #24

Apr 232016


  • 22,269 miles


Valve guides out of wear with possible failure including valve to drop inside combustion chamber

- St Paul, MN, USA

problem #23

Jan 042016


  • 54,000 miles
Excessive valve train noise, engine noise, knocking.

- Austin, AR, USA

problem #22

Oct 292012


  • 51,051 miles
I was interning the interstate 15 in California and was picking up speed to inter the hwy and my Corvette Z06 starting making a knocking sound and lost power and I turned it off and had it looked at my a very well know automotive shop who specializes in GM vehicles. They told me it drop an exhaust valve.

- Summerville, GA, USA

problem #21

Oct 132015


  • 29,400 miles


I was concerned about a noise that I was hearing in my 2006 Z06 that is unlike any other noise I have heard while currently owning my three other GM vehicles. I decided to bring it to a well know corvette speciality shop near me. The told me about the valve guide issue that has been linked to the LS7 heads. I immediately told him to take the heads off the car and check them. I had 4 exhaust valves that were way out of GM specs. I had the heads re-machined properly and installed new intake and exhaust valve guides, valve springs and seals.

- San Leandro, CA, USA

problem #20

Sep 272014


  • 59,000 miles
I was driving down a busy street at 35 mph in heavy traffic and heard a metallic sound. The engine locked up and the rear end skidded till I put in the clutch and coasted to a parking lot. I was aware of the valve problems so I took the head off the engine and sure enough dropped a valve taking out the piston and breaking the block. I took the car to kool Chevy and was told in would cost 22,000 dollars to fix it. Kool told me GM would not cover any of it because the car was out of warranty at 59,000 mile on the car. I could not afford to fix the car so I sold the car as is losing more than half what the car was worth. I am still sick about this a year later as I will never be able to have another car like this. I feel like GM should have worked with me as this was a known problem with the LS7 engine. If this would have happened at highway speeds it would have been a lot worse than it was. Lost power steering, power brakes, and skidded when the engine locked up.

- Wyoming, MI, USA

problem #19

Aug 172015


  • 6,100 miles
The contact owns a 2006 Chevrolet Corvette. While driving at any speed, the engine shook and the harmonic balancer wobbled. The failure recurred several times. The vehicle was taken to the dealer where it was diagnosed that the harmonic balancer needed to be repaired. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 6,100.

- Coral Springs, FL, USA

problem #18

May 082015


  • 23,111 miles
Any quick search of the web will show that this car engine, the LS2 or 6.2 L engine has had a defect that GM has denied over the years and fails to stand behind after warranty; crank shaft pulley wobble and worn rubber gaskets on the harmonic balancer of the 2006 model year. Tech bulletins have been issued and this topic of pulley wobble and rubber gasket failure and is quite the talk on various Corvette forums. Since I am well behind warranty, I had to have this diagnosed through my licensed certified auto mechanic. This repair requires extensive labor time to repair. Scared to see the bill tomorrow. GM's response is I should of taken it to an authorized Chevy dealer. That is hog wash because should I had done that, I would probably still had to pay their exorbitant labor costs and still not be covered on this serious engine defect. In fact, I believe GM has re-designed the part so what does that tell you. Failure to fix will just harm the engine for the future and replace belt after belt when the true problem is ignored by

- Mickleton, NJ, USA

problem #17

Aug 022012

Corvette 8-cyl

  • 29,000 miles


Cruising at 50 mph on feeder ramp and dic showed engine power reduced for 2 seconds then boom!

- Humble, TX, USA

problem #16

Dec 112013

Corvette 8-cyl

  • 56,000 miles
I bought this Corvette Z06 used from a private party. The engine had a catastrophic failure due to a known issue with the valve guides and valves in the LS7 motor from the factory. I was driving home from work when the motor failed. I was lucky to be only a mile from home when it failed and I was able to coast into my garage. The exhaust valve dropped and destroyed the #1 piston along with that cylinder, and the engine block. Nothing in the motor is salvageable as it bent or sent metal shards into every part of the motor. I have tried several times to get Chevy to help me with this motor, but they will not help at all. They know about the problem, but will not lift a finger to help anyone.

- Sacramento, CA, USA

problem #15

Mar 262015

Corvette 8-cyl

  • 47,156 miles
Manufacturing defected in the LS7 motor. Upon further investigation I had my 2006 Corvette Z06 inspected for a loud audible tick in the motor. The source of this noise was from the in-balance from the #3 and #4 intake valves on the engines heads. There is premature wear on both valve guides causing internal failure to the motor. Under power demand the in-balance will cause the titanium rod to strike the sides of the valve seat causing the head of the valve to crack and fall into the cylinder. Once this occurs instant catastrophic failure of the motor happens resulting in white bellowing smoke from the exhaust, oil spillage, and engine lock resulting in the vehicle skidding off the road or loosing control. Fortunately for me I caught this in time before having a catastrophic failure. Both LS7 heads are being repaired and machined to meet industry standards. This problem must be addressed to all LS7 Z06 owners as it could and has caused several crashes and possible deaths. Once repairs to the LS7 heads are made the vehicle can be returned to service.

- Las Vegas, NV, USA

problem #14

Apr 202013


  • 19,000 miles
2006 Z06 corvette engine was making an unusual noise. After doing some research and the finding, it was determined that the valvetrain on the engine may be pending failure. The heads were removed and valve train tolerance checked to be found way out of serviceable limits. Thus requiring repair. This was considered excessive wear for such a low mileage vehicle that was pending catastrophic engine failure if the repairs to the heads was not performed. In doing additional research, this appears to be quite common for the Z06's 7.0L LS7 engine. Luckily my engine did not have a catastrophic failure because I took preventative measures at my own cost, but this design should be considered a failure and recalled. I was not going to risk a catastrophic engine failure possibly on the highway and put myself and others at risk. Please investigate.

- Homer Glen, IL, USA

problem #13

Feb 122011


  • 29,000 miles
The exhaust valve broke and destroyed the motor

- Cape Coral, FL, USA

problem #12

Jul 052012

Corvette 8-cyl

  • 16,000 miles
Date of heads pulled: 7/5/12 head type: GM LS7 year: 2006 miles: 16,000 track time: None tune: Stock I had my cylinder heads removed because I was paranoid after reading online about many other owners having issues with their valve guides being out of spec. My cylinder heads had valve guides that were way out of spec and the car only had 16,000 miles on it and was never tracked or abused. These were on the verge of having the valve break off and seize the motor which could have resulted in serious injury to myself and others around me while driving. I paid out of my own pocket to have these heads redone. Max allowable clearance is 0.0037 for both intake and exhaust. Valve guide clearances intake #1 top.0027 mid.0021 bot.0024 intake #2 top.0030 mid.0022 bot.0028 intake #3 top.0025 mid.0022 bot.0023 intake #4 top.0030 mid.0023 bot.0025 intake #5 top.0033 mid.0022 bot.0027 intake #6 top.0028 mid.0022 bot.0025 intake #7 top.0029 mid.0023 bot.0027 intake #8 top.0030 mid.0023 bot.0028 ========================= exhaust #1 top.0022 mid.0026 bot.0069 exhaust #2 top.0022 mid.0024 bot.0048 exhaust #3 top.0020 mid.0028 bot.0064 exhaust #4 top.0022 mid.0024 bot.0039 exhaust #5 top.0021 mid.0029 bot.0085 exhaust #6 top.0021 mid.0023 bot.0046 exhaust #7 top.0021 mid.0024 bot.0054 exhaust #8 top.0022 mid.0025 bot.0033.

- Coplay, PA, USA

problem #11

Dec 012014

Corvette 8-cyl

  • 42,507 miles
I started the car when it was cold, it began to squeal from the belts. I gave it a small rev and it squealed intensely, I mean very loudly! I opened the hood and belts were not moving. I could not move the car. The harmonic balancer had lost it's bond. I am just glad I was sitting still. At speed, the steering would have been lost, it could have killed me! I had the car towed to the shop, and it cost me $1000. Not good! I read that this happens alot. Bad design for sure. I should be reimbursed. What can I do? Chevy won't even talk to me about it. It's a shame because I love my car, but now I am afraid to drive it!

- Myrtle Beach, SC, USA

problem #10

Jun 092013

Corvette 8-cyl

  • 53,083 miles
My son was driving and just completed a turn when he applied the accelerator and the engine stopped abruptly. There was a cloud of smoke and then a small fire underneath the car from the oil that came out from a baseball size hole in the side of the block below the number 8 cylinder. Upon further investigation, a valve in the number 8 cylinder snapped below the valve guide dropping the head of the valve onto the piston which caused the failure. I have the engine available for inspection.

- Carrollton, TX, USA

problem #9

Nov 012014

Corvette 8-cyl

  • 36,000 miles
Hello, I am reporting on my 2006 C6Z06 corvette that recently had the valve-to-guide clearances checked on my engine and my measurements are beyond the serviceable specifications on 8 out of 16 valves, both intake and exhaust. I consider this a safety hazard due to the fact that if the vehicle is driven and engine seizes, loss of control may occur. I also have what appears to be a leak on the fuel module/sending unit, specifically on the top plastic elbow connector. I have strong gasoline odor in the cabin of the car and visible gasoline from the underside of the car near the fuel tank.

- Austin, TX, USA

problem #8

Jan 062014

Corvette 8-cyl

  • 36,000 miles
I was concerned about excessive valve train noise and after reading several accounts of improperly machined heads by GM's supplier linamar, and that numerous vehicles have had valves drop, resulting in engine failure. As a result, after having been rebuffed by Chevrolet, I took my car with 36,000 miles on it to a Corvette specialty shop to have my valve guide clearance tested. I had several exhaust valve guides outside the maximum service specifications, indicating that a catastrophic engine failure was imminent. The car was 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: 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 loss of steering, braking capability, and which can result 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 while the vehicle is underway on public roadways.

- Ooltewah, TN, USA

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