P0121 on the 2004 Cadillac CTS
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.
Nobody has written a description of this code yet.
| 050604032 | 2005-11-04. Service bulletin. 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. A REDUCED ENGINE POWER COMPLAINT SETTING THROTTLE CODES - P0121, P0221, P2119, P2122, P2138, P2176. *TT |
2 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.