P0021 — OBD-II trouble code

A generic powertrain OBD-II trouble code. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0021 across 17 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report P0021 17 patterns

2020 Chevrolet Blazer

powertrain — Camshaft timing over-advanced fault

2019 Ford Expedition

engine — Cam Phaser/VCT System Failure

2018 Chevrolet Traverse

powertrain — Transmission slipping and intermittent power loss during acceleration

2018 Chevrolet Traverse

engine — Transmission/Drivability Electrical Faults (TCM, solenoid, shift sensor)

2017 Hyundai Santa Fe

engine — Excessive oil consumption

2017 Hyundai Santa Fe

powertrain — Catastrophic engine seizure and oil consumption

2014 GMC Acadia

engine — Check engine light with timing chain and camshaft actuator codes

2014 Kia Cadenza

engine — Excessive oil consumption and internal engine damage

2014 Subaru Impreza

engine — Engine Stall While Driving

2013 Cadillac SRX

cruise control — Throttle/transmission hesitation and lag during acceleration

2013 Subaru Impreza

powertrain — CVT Transmission Valve Body / Control System Failure

2013 Subaru XV CrossTrek

electrical — Electrical system stall and loss of power while driving

2012 INFINITI QX56

engine — Timing chain stretch and failure

2012 Subaru Impreza

engine — Fractured or Broken Valve Springs

2011 Nissan Maxima

powertrain — Engine timing chain cover deterioration — oil pressure loss

2007 Subaru Impreza

engine — Head Gasket Failure

2006 Subaru Impreza

engine — Banjo bolt filter/screen fracture in oil line

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →