P0015 Exhaust Camshaft Position Timing Over-Retarded Bank 1

P0015 means exhaust camshaft timing on bank 1 is over-retarded. The cam timing is not advancing to the commanded position within expected limits.

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 the cam sensor alone for an over-retarded timing fault without checking oil control and mechanical timing.

Symptoms of P0015

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 P0015

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 exhaust cam timing, oil temperature, engine speed, load, and VVT solenoid duty cycle during the fault.
Inspect oil level, oil condition, filter condition, VVT solenoid operation, cam actuator behavior, and timing chain or belt alignment.
Check for sludge, low oil pressure, stuck cam phasers, related crank/cam correlation codes, and recent timing or oil service.

Related OBD-II codes

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