Friday, September 24, 2021
News General Motors V8 Valve Spring Problems Addressed In Service Bulletin

General Motors V8 Valve Spring Problems Addressed In Service Bulletin

Some GM V8 engines may be experiencing noises and misfires because of a fault valve spring

  • GM’s recent V8 engines have experienced check engine issues caused by faulty valve springs

  • The issue is addressed in a recent service bulletin from GM


GM vehicles equipped with V8 engines may show a service engine light as well as experience various other problems including misfires and odd noises. The issue is apparently caused by faulty valve springs according to a recent GM service bulletin.

The bulletin instructs GM technicians to check for a broken valve spring and perform a cylinder leak test if needed. If the test proves conclusive, service departments are instructed to replace all valve springs if the vehicle was built between June 1 and September 15 2020.

According to GM Authority, this only applies to the L87, LT1, LT2, and LT4 6.2-litre V8 GM engines. For L82, L84, and L8T V8 engines, dealers are required to replace the problematic valve spring.

The scope of the affected V8 engines is wide and touches a range of models including the new Chevy Corvette, the Camaro, and the GMC Sierra HD and Silverado HD heavy duty trucks.

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Charles Jolicoeur was studying to be a CPA when he decided to drop everything and launch a car website in 2012. Don't ask. The journey has been an interesting one, but today he has co-founded and manages 8 websites including EcoloAuto.com and MotorIllustrated.com as General Manager of NetMedia360. He also sits on the board of the Automotive Journalists Association of Canada. Send me an email

7 COMMENTS

  1. So this finally explains it… Just got a new 2020 silverado trail boss w 6.2 this month & it suddenly started acting up & shut off on me in traffic & wouldn’t restart. Aftr a long process of getting it towed & back 2 dealer (thanks roadside assistance) they spoke w GM mechanics & determined it had a broken valve spring & that caused catastrophic engine damage. They r replacing the engine & components now. I’ve been w/out it for 11 days & supposed to 2 get it back next week sometime I guess. What was my dream truck is now a nightmare. & i called customer service 2 complain & c what they were going 2 do 4 me & they were 2 get back 2 me in 24 hrs & it took them a week 2 get back 2 me. This is so frustrating.

  2. Second day of my new 6.2 Silveradoit was idling and shut off Tried restarting it would not eep running. 2 weeks in the shop and no diagnosis as of yet. It is a High Country with 70 miles. Not a happy camper.

  3. Purchased 2020 GMC Sierra AT4 6.2L. Engine died in traffic after 1 week with less than 300 miles on it. Broken valve spring. Dealership wanted to blame me due to new Borla exhaust and K and N air filter. Unbelievable!

  4. Bought a new 2021 lt1 camaro didn’t make it home. 97 miles on it and engine blowed. I think we ought a do a class action. I bought to keep as a collector and I have a non matching numbers car.

  5. This is happening on the 5.3 engines as well. I bought a new 2020 Silverado RST and a valve spring broke driving home from hunting. On the side of the road for 1.5 hours. It has been in the shop for 10 days now. It had 1031 miles. They are still waiting to fix and further check for any additional damage to the pistons or cylinder wall. According to a highly knowledgeable mechanic friend, this has been happening to the 5.3 engine for at least 6 years and GM still hasn’t addressed it.

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