P0021

Showing the 60 model years where P0021 appears most; it is on file for 122 in total.

A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.

Owners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.

Service bulletins and campaigns whose filed summary names P0021. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

• SSM 54366
  2025-11-12 · Power Train
• Some 2015-2021 Ford and Lincoln vehicles may exhibit an illuminated MIL with diagnostic trouble codes (DTCs) P0011, P0012, P0014, P0015, P0016, P0017, P0018, P0019, P0021, P0022, P0024 and/or P0025. Pinpoint test HK in the Powertrain Control and Emissions Diagnosis (PC/ED) or in Section 303-14 of the Workshop Manual (WSM) has been updated to address this concern.
• 09-104-23R
  2023-12-15 · Engine And Engine Cooling
• This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 1) and P0021 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM.
• 09-105-23R
  2023-10-12 · Engine And Engine Cooling
• This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or SystemPerformance Bank 1) and P0021 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM.
• 09-104-23R
  2023-10-12 · Electrical System
• This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 1) and P0021 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM. The new files contain enhanced logic to optimize the de
• 09-105-23
  2023-05-09 · Engine And Engine Cooling
• This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 1) and P0021 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM.
• 09-105-23
  2023-05-09 · Engine And Engine Cooling
• This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 1) and P0021 (“Aâ€Â� Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM.

A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.