P0021 on the 2018 Buick Enclave
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.
| 17-NA-317 | 2021-04-15. Service bulletin. Transmission Shudder, Low Idle, Stalling after Auto Start , Reduced Engine Power Displayed on Driver Information Center (DIC), Malfunction Indicator Lamp (MIL) Illuminated - DTCs P034B, P0506, P0011, P0014, P0021 and/or P0024 Set Some customers may comment on the following conditions: • MIL is illuminated • Transmission shudder • Low idle • Stall after auto start • Reduced Engine Power displayed on DIC The technician may find one or more of the following DTCs set: • P034B • P0506 • P0011 • P0014 • P0021 • P0024 Cause This condition may be caused by the Crankshaft Position Sensor (CPS) circuit picking up EMI interference from unrelated control circuit in the same harness. Correction Replace the crank sensor portion of engine harness with a twisted pair jumper harness between the crank sensor and ECM connector. |
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| N192266190 02 | 2019-11-12. Service bulletin. N192266190 02 - Service Update - (Revised Service Procedure for XT5). Certain vehicles may have an engine control software issue that can occur during an automatic stop/start event. Immediately following an auto-start and while the vehicle is stopped, this condition can cause the engine to run rough, run at reduced power, or, in rare cases, stall. DTC?s P0011, P0021, P0014, and P0024 may set. Dealers will reprogram the engine control module (ECM). |
| N192266190 01 | 2019-10-21. Service bulletin. N192266190 01 - Service Update. Certain 2018 model year Buick LaCrosse, Enclave, Cadillac XT5 and Chevrolet Traverse vehicles may have an engine control software issue that can occur during an automatic stop/start event. Immediately following an auto-start and while the vehicle is stopped, this condition can cause the engine to run rough, run at reduced power, or, in rare cases, stall. DTC?s P0011, P0021, P0014, and P0024 may set. Dealers will reprogram the engine control module (ECM). |
| N192266190 | 2019-10-21. Service bulletin. N192266190 - Service Update. Certain vehicles may have an engine control software issue that can occur during a stop/start event that is causing drivability concerns such as the engine running roughly. Potential reduced engine power or engine stall with DTC?s P0011, P0021, P0014, and P0024 may set. Dealers will reprogram the engine control module (ECM). |
| PIP5568E | 2019-03-11. Service bulletin. This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). Revised to include the possibility of setting in pairs and some drivability concerns. |
| PIP5568C | 2018-12-17. Service bulletin. This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). Revised to include the possibility of setting in pairs and some drivability concerns. |
| PIP5568B | 2018-08-20. Service bulletin. This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). |
| PIP5568A | 2018-08-06. Service bulletin. This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). |
| PIP5568 | 2018-06-18. Service bulletin. This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). |
9 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.