BUICK, CADILLAC, CHEVROLET, GMC
21NA124
Manufacturer communications
- Publication date
- 2021-05-25
- Received by NHTSA
- 2021-07-06
- NHTSA record numbers
- 10198890 · 10199281
Multiple filings of the same bulletin are grouped here; original record numbers remain available.
Manufacturer summary
Original wording in English
This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
Reported code forms
Check vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.