A service update has been issued for certain 2021 model-year GM trucks and SUVs over an issue related to the vehicles’ engine manifold pressure sensor.
The problem: affected GM trucks and SUVs may come equipped with a faulty engine manifold absolute pressure sensor that can produce an improper or erratic signal. This may result in the ‘Service Engine Soon’ light appearing on the vehicle’s instrument panel. The problem may also cause the ‘Service Engine Soon’ light to switch on and off intermittently.
The hazards: while this problem does not pose a safety risk to the driver or vehicle occupants, the light will stay on or keep switching on and off until the problem is addressed.
The fix: GM dealers will be instructed to replace the engine manifold absolute pressure sensor. This will prevent the ‘Service Engine Soon’ light from coming on. The related service update document indicates this fix should be performed on vehicles that are in GM dealership inventory only. The service update will expire in May of 2022.
Affected components: engine manifold absolute pressure sensor.
- 2021 Cadillac Escalade
- 2021 Cadillac Escalade ESV
- 2021 Chevy Tahoe
- 2021 Chevy Suburban
- 2021 Chevy Silverado
- 2021 Chevy Silverado HD
- 2021 Chevy Express
- 2021 GMC Sierra
- 2021 GMC Sierra HD
- 2021 GMC Yukon
- 2021 GMC Yukon XL
- 2021 GMC Savana
Number of affected vehicles: it is not clear how many GM trucks and SUVs may be affected by this particular problem.
Owners should: owners of affected GM trucks and SUVs will be contacted by the automaker and instructed to make an appointment with their dealer. Owners can also reach out to Cadillac, Chevy or GMC directly with further questions and concerns by using the contact information included below.
- GM Service Update Number: 212332660
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782
- Cadillac Customer Service: 1-877-248-2080