Code Definition

P0025 — Camshaft Position B - Timing Over-Retarded (Bank 2)

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

About P0025

P0025 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 P0025 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 P0025 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

P0025 relates to the variable valve timing system on the B camshaft of bank 2, which on most engines is the exhaust camshaft on the cylinder bank that does not contain cylinder number one. The engine control module commands a cam phaser through an oil control valve to advance and retard cam timing and confirms the result with the camshaft and crankshaft position sensors. DTC P0025 sets when the actual B camshaft timing stays more retarded than the ECM commanded, or the phaser will not advance as requested, usually because of an oil control valve fault, a stuck phaser, or restricted oil flow. W...

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