What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
6Original wording in English
BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, PONTIAC, SAAB
Reported code forms P0121
This PI was superseded to update model years and add information concerning idle surge, reduced engine power mode, and/or DTCs P0068, P0121, P1516, P2101, P2119, and/or P2176 that may be experienced on high mileage…
CADILLAC
Reported code forms P0121-00
17096 - Service Update. Certain vehicles, may have a condition in which the engine air filter element does not have glue beads across the paper pleating. If this condition is present the pleats can fold over on…
CADILLAC
Reported code forms P0121
This Preliminary Information communication provides information to the technician about vehicles that the engine may shut off after wide open throttle maneuvers also the Service Engine Soon Malfunction Indicator Lamp…
CADILLAC
Reported code forms P0121
THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT THE ENGINE MAY SHUT OFF AFTER WIDE OPEN THROTTLE MANEUVERS ALSO THE SERVICE ENGINE SOON MALFUNCTION INDICATOR LAMP…
BUICK, CADILLAC
Reported code forms P0121
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
CADILLAC
Reported code forms P0121
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,…
Check vehicle applicability
14A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | CTS | 2018 |
| Cadillac | CTS | 2017 |
| Cadillac | CTS | 2016 |
| Cadillac | CTS | 2015 |
| Cadillac | CTS | 2014 |
| Cadillac | CTS | 2013 |
| Cadillac | CTS | 2012 |
| Cadillac | CTS | 2011 |
| Cadillac | CTS | 2010 |
| Cadillac | CTS | 2009 |
| Cadillac | CTS | 2008 |
| Cadillac | CTS | 2007 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.