General Motors has released a fix to address a parasitic battery drain issue that affects certain examples of the 2021 Chevy Silverado 1500 and 2021 GMC Sierra 1500 light duty full-size pickup trucks.
The problem: in affected trucks, the engine control module (ECM) may have an improper diagnostic calibration causing the engine electronics to remain on even while the vehicle has been turned off. This leads to a parasitic drain on the battery and can fully drain the battery while the vehicle sits parked. This problem will also produce diagnostic trouble code (DTC) P0111, as well as other “low voltage” DTCs.
The hazards: this issue does not pose an immediate safety risk to the driver or vehicle occupants. A parasitic drain on the battery could leave the vehicle’s user stranded, however, so it’s ideal that this problem is addressed.
The fix: dealers will update the ECM with the latest calibrations from GM. This will fully resolve the parasitic battery drain issue.
Affected components: engine control module.
- 2021 Chevy Silverado 1500 (with 5.3L V8 engine only)
- 2021 GMC Sierra 1500 (with 5.3L V8 engine only)
Number of affected vehicles: GM has not said how many vehicles may be affected by this particular issue.
Next steps: GM will notify owners of affected vehicles and instruct them to make an appointment with their dealer. Owners of affected vehicles with further questions or concerns can also reach out to Chevrolet or GMC directly using the contact information included below. This Customer Satisfaction Program started in April 2021 and will remain in effect until May 31st, 2023. Involved vehicles in dealership inventory must also be held and not delivered or used for demonstration purposes until the ECM update has been completed.
- GM Customer Satisfaction Program number: N212335340
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782