Service bulletins for the 2004 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.
567 on file from NHTSA, as of 2026-10-19.
About P0121 on the 2004 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
| 050604032 | 2005-11-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. REDUCED ENGINE POWER, SERVICE ENGINE SOON (SES) LIGHT WITH ONE OR MORE OF THE FOLLOWING DTCS P0121, P0221, P2119, P2122, P2138, P2176. *TT UPDATED 08-20-07. *KB |
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| 01879 | 2004-05-04. Service bulletin. ELECTRICAL SYSTEM. A REDUCED ENGINE POWER COMPLAINT SETTING THROTTLE CODES - P0121, P0221, P2119, P2122, P2138, P2176. *TT |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.