Service bulletins for the 2003 Cadillac CTS
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
506 on file from NHTSA, as of 2026-10-19.
About P0121 on the 2003 Cadillac CTS: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
Only bulletins with trouble code: P0121 are shown. Show all
| 01108A | 2004-02-28. Service bulletin. ELECTRICAL SYSTEM. INTERMITTENT NO POWER, STALL, MALFUNCTION INDICATOR LAMP (MIL) WITH TPS, TAC, TCM DIAGNOSTIC TROUBLE CODES (DTCS) SET P0120, P0121, P0122, P0123, P0220, P0221, P0223, P0225, P0226, P0227, P0228, P0638, P0700, P1779, P1780, P1995, P2119, P2176. *TT |
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| 050803 | 2003-10-27. Service bulletin. ELECTRICAL SYSTEM. SERVICE ENGINE SOON (SES) LIGHT COMING ON AND A P0121 TPS CODE STORED OR RELATED CODES. *TT |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.