Code Definition

P0012 — Intake Variable Camshaft Position - Timing Over-Retarded (Bank 1)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0012

P0012 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0012 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0012 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC P0012 indicates that the Engine Control Module (ECM) has detected that the intake camshaft on Bank 1 is running in an over retarded position, meaning the actual cam timing is lagging behind the commanded target by more than the calibrated threshold. The variable valve timing (VVT) system uses oil pressure directed through an ECM controlled oil control valve to rotate the camshaft phaser and advance or retard the intake cam relative to the crankshaft. When this code sets, the ECM has compared the camshaft position sensor signal to the crankshaft reference and found the cam failing to advanc...

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