Exhaust Camshaft Position Timing Over-Retarded (Bank 2)
What does P0025 mean?
The P0025 code means the vehicle's onboard diagnostic system has detected: Exhaust Camshaft Position Timing Over-Retarded (Bank 2). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Rough idle or engine shaking
- Loss of power during acceleration
- Poor fuel economy
- Engine may stall at idle
Probable Causes (Ranked by Likelihood)
- Low or dirty engine oil Very High
- Failed exhaust VVT solenoid (bank 2) High
- Clogged oil passages to the exhaust camshaft phaser Moderate
- Worn or stuck exhaust camshaft phaser Moderate
- Stretched timing chain on bank 2 Low
Step-by-Step Diagnostic Procedure
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Check engine oil level and quality. Low or contaminated oil is the most common cause. Perform an oil change with the manufacturer-specified viscosity.
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Using a scan tool, monitor bank 2 exhaust camshaft position at idle and 2,500 RPM. The actual position should be within 3-5 degrees of the desired target.
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Remove the bank 2 exhaust VVT solenoid and inspect for clogged oil screen or internal debris. Test resistance (6-13 ohms typical).
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Command the solenoid on/off via scan tool while watching cam position. If position does not change, suspect a stuck phaser or blocked oil passage.
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If all VVT components test good, check the timing chain for stretch and tensioner for proper operation.
Frequently Asked Questions
Can I drive with code P0025?
You can drive short distances. The engine will have reduced power because the exhaust camshaft on bank 2 is stuck in a retarded position. Get it diagnosed within a few days to prevent additional engine wear.
What is the difference between P0015 and P0025?
P0015 is exhaust camshaft over-retarded on bank 1 and P0025 is the same condition on bank 2. On a V-engine, each bank has its own VVT system, so the fault is on different sides of the engine.
Will a fresh oil change fix P0025?
In many cases, yes. The VVT system depends on clean, properly pressurized oil. If the code appeared because the oil was overdue or the wrong viscosity was used, a fresh oil change and code clear often resolves the issue.