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P0015 — B Camshaft Position Timing Over Retarded Bank 1

Generic OBD-II · all makesPowertrain (engine & transmission)

P0015 indicates that the engine computer has detected the camshaft on Bank 1 is consistently timed more retarded than the commanded target. This is typically tied to variable valve timing (VVT) control, oil flow, or camshaft actuator operation rather than the camshaft itself being out of mechanical time.

Symptoms

What causes it — most likely first

1. Dirty or degraded engine oil

Sludged or old oil can restrict flow to the VVT actuator, preventing it from reaching commanded timing. This is the most common contributor to cam timing over-retarded codes.

2. Faulty VVT oil control solenoid

The oil control valve may stick open or closed due to debris or internal failure, causing the camshaft to remain retarded. Solenoid operation should be tested before replacement.

3. Failed or sticking camshaft phaser/actuator

The camshaft actuator can mechanically bind or lose internal lock-pin function, leaving the camshaft unable to advance. This often requires cam actuator replacement.

4. Wiring or connector issue at the VVT solenoid

Corroded, chafed, or loose wiring to the oil control solenoid can prevent proper commanded operation. This should be verified before replacing the solenoid itself.

5. Stretched timing chain or jumped timing

Mechanical timing wear can push cam position outside the expected range. This is more likely on higher-mileage engines and may be accompanied by chain noise.

6. Engine computer (PCM/ECM) failure

An internal driver failure in the PCM is rare. It should only be considered after all solenoid, wiring, oil, and mechanical timing checks are completed.

How it's diagnosed

  1. Check engine oil level and condition; perform an oil change if dirty, overdue, or incorrect viscosity.
  2. Inspect the VVT oil control solenoid connector and wiring for corrosion, looseness, or damage.
  3. Command the VVT solenoid with a scan tool and observe camshaft position response; verify solenoid resistance against specification.
  4. Remove the oil control solenoid and inspect screens for sludge or debris; clean or replace as needed.
  5. Compare Bank 1 camshaft desired versus actual timing data under varied RPM and load.
  6. If electrical and oil checks pass, inspect camshaft phaser operation and mechanical timing components for wear or chain stretch.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationSAE generic — identical on every make
Related codesP0010 — Camshaft Position Actuator Control CirP0011 — Camshaft Position Timing Over AdvancP0012 — Camshaft Position Timing Over RetardP0013 — B Camshaft Position Actuator Control CP0014 — B Camshaft Position Timing Over AdvaP0016 — Crankshaft Position Camshaft Positio

Vehicles this code applies to

The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:

2021 Volvo XC402021 Volvo XC40 Recharge

Frequently asked

Can I keep driving with a P0015 code?

Short trips may be possible, but continued driving can reduce performance, fuel economy, and emissions compliance. In some engines, severe timing retard can increase the risk of catalytic converter or valve damage, so prompt diagnosis is advised.

Will an oil change fix P0015?

If the oil is dirty, low, or the wrong viscosity, an oil change can resolve the code. However, if the solenoid, phaser, wiring, or timing chain is faulty, an oil change alone will not fix it.

Should I replace the PCM for a P0015 code?

No. PCM failure is very rarely the cause of P0015. Most cases involve oil condition, the VVT solenoid, the camshaft actuator, wiring, or mechanical timing. Replacing the engine computer should be a last resort after all other causes are ruled out.

Is P0015 the same as a jumped timing chain?

Not necessarily. P0015 means the camshaft is more retarded than commanded, which can be caused by oil flow, solenoid, or actuator issues. A stretched or jumped timing chain is one possible cause, but it is not the most common.