# P1221 on the 2002 GMC B7

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P1221

- [629495](https://open.wenmarpro.com/bulletins/629495), 2002-04-02: SUBJECT REGARDING REVISED DIAGNOSTIC TROUBLE CODE P1221 SERVICE MANUAL INFORMATION. \*TT