General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems.
The problem: affected vehicles may have or may be prone to experiencing a broken valve lifter lock pin spring. This problem only affectes vehicles equipped with the naturally aspirated 5.3L L84 V8 or 6.2L L87 V8 gasoline engines.
The hazards: this problem does not pose a safety hazard, however a broken valve lifter long spring can lead to various engine problems. As we reported in a previous article that addressed these widespread GM V8 engine valve lifter issues, affected vehicles may produce a service engine light, along with a misfire, peculiar engine noise and engine damage.
The fix: dealership technicians are instructed to replace both banks of cylinders in affected vehicles. These repairs must be performed upon arrival at the dealership and before the vehicles are sold to customers.
- 2021 Cadillac Escalade
- 2021 Cadillac Escalade ESV
- 2021 Chevrolet Tahoe
- 2021 Chevy Suburban
- 2021 Chevy SIlverado 1500
- 2021 GMC Yukon
- 2021 GMC Yukon XL
Affected components: valve lifter, valve lifter lock pin spring.
Number of affected vehicles: it’s currently not clear how many vehicles were delivered to dealers in need of a valve lifter repair.
Owners should: this service update is for dealerships only and only affects vehicles that are en route to or have already been delivered to GM dealerships. No action is required by owners.
GM Authority has reported on these V8 engine valve lifter problems in the past, including an article outlining how GM dealers address the issues on customer vehicles. If you own a 5.3L L84 V8 or 6.2L L87 V8-powered GM vehicle, it may be worth reading up on these problems.
- GM service update number: N212353840
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782
- Cadillac Customer Service: 1- 800-333-4223
- National Highway Traffic Safety Administration Vehicle Safety Hotline: 1-888-327-4236