P1221 on the 2002 GMC Envoy
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. Its meaning is in the manufacturer's service information.
| 3138 | 2005-02-01. Service bulletin. REDUCED POWER LIGHT ON AND DIAGNOSTIC TROUBLE CODE P1680 P1221 AND OR P1271 STORED IN THE POWERTRAIN CONTROL MODULE. *EH |
|---|---|
| 3192 | 2004-12-15. Service bulletin. REDUCED ENGINE POWER MESSAGE AND/OR CHECK ENGINE LIGHT WITH ANY COMBINATION OF THE FOLLOWING DIAGNOSTIC TROUBLE CODES: P0107, P0112, P0452, P1120, P1220, P1221, P1271, P1275, P1280, P1481, P1515, P1540, P1633, P1635, P1639 AND P1682 POWERTRAIN CONTROL MODULE REPEAT. *TT |
| 3138 | 2004-11-04. Service bulletin. REDUCED POWER LIGHT ON AND DIAGNOSTIC TROUBLE CODE P1680 P1221 AND/OR P1271 STORED IN THE POWER CONTROL MODULE. *SC |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.