P0025 Exhaust Camshaft Position Timing Over-Retarded Bank 2

P0025 means exhaust camshaft timing on bank 2 is over-retarded. The camshaft position remains more retarded than commanded.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace cam position sensors before checking oil-control, phaser movement, and mechanical timing.

Symptoms of P0025

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0025

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare commanded and actual bank 2 exhaust cam timing, VVT solenoid command, oil temperature, engine load, and RPM.
Inspect oil level, oil condition, VVT solenoid screens, cam phaser operation, oil pressure, and timing chain or belt alignment.
Check for sludge, sticking actuators, related crank/cam correlation codes, and recent oil or timing service that may affect bank 2.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.