P0015

B Camshaft Timing Over-Retarded (Bank 1)

The engine computer sees the camshaft timing on bank 1 too far behind where it should be. This usually means the oil control system, timing parts, or cam timing actuator is not working correctly. It can cause rough running, poor power, and engine warning lights.

Severity4/5 High

Can I drive?⚠ With caution

You may be able to drive short distances, but engine performance can be poor and the problem can worsen. Do not continue driving if the engine runs rough, stalls, or makes timing-chain noise.

DIY

$20–$300

Shop

$150–$1,200

Difficulty

intermediate

What It Means

P0015 means the powertrain control module has detected that the B camshaft on bank 1 is over-retarded beyond the allowed range. On most engines, the B camshaft refers to the exhaust camshaft, and the condition is usually related to variable valve timing control, oil flow, or a mechanical timing issue. If the cam timing cannot return to spec, the engine may set performance and emissions faults.

Symptoms

•Check engine light
•Rough idle
•Reduced power
•Poor acceleration
•Hard starting
•Increased fuel consumption
•Engine may stall
•Rattling or ticking noise from timing area

Common Causes

1. Low engine oil level, dirty oil, or incorrect oil viscosity affecting variable valve timing operationhigh

2. Faulty camshaft timing solenoid / oil control valvehigh

3. Sticking or worn camshaft phaser / cam timing actuatormedium

4. Timing chain stretch, jumped timing, or worn timing componentsmedium

5. Wiring damage, connector corrosion, or poor connection to the cam timing systemmedium

6. Faulty camshaft position sensor or crankshaft position sensor signal issuelow

7. Engine mechanical problem such as sludge buildup or restricted oil passageslow

FAQ

What does bank 1 mean?

Bank 1 is the side of the engine that contains cylinder number 1.

What does camshaft B mean?

On many engines, camshaft B refers to the exhaust camshaft. Some manufacturers may label it differently, so always check the service information for the exact engine.

Can bad oil cause P0015?

Yes. Low oil level, dirty oil, or the wrong oil viscosity can keep the cam timing system from working correctly.

Will clearing the code fix it?

No. The code will usually come back unless the underlying oil, electrical, or timing problem is repaired.