Exhaust Camshaft Position Timing Over-Advanced (Bank 2)
What does P0024 mean?
The P0024 code means the vehicle's onboard diagnostic system has detected: Exhaust Camshaft Position Timing Over-Advanced (Bank 2). This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Rough idle with possible engine vibration
- Hard starting, especially when warm
- Reduced engine power
- Increased exhaust emissions
Probable Causes (Ranked by Likelihood)
- Low or degraded engine oil Very High
- Faulty exhaust VVT solenoid (bank 2) High
- Stuck exhaust camshaft phaser in advanced position Moderate
- Timing chain stretch affecting bank 2 exhaust cam Moderate
- Clogged oil galleries to the exhaust cam phaser Low
Step-by-Step Diagnostic Procedure
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Check engine oil level and condition. Top off or change oil if low, dirty, or the wrong viscosity. Clear codes and retest.
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Use a scan tool to monitor bank 2 exhaust camshaft position. Compare actual vs. desired at idle and 2,500 RPM. Over-advanced by more than 5 degrees confirms the fault.
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Remove and inspect the bank 2 exhaust VVT solenoid for clogged screens or debris. Measure resistance (6-13 ohms typical).
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Command the VVT solenoid with a scan tool and monitor cam position change. No movement suggests a stuck phaser or blocked oil passages.
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Inspect the timing chain for excessive slack on bank 2. Check the tensioner and guides for wear.
Frequently Asked Questions
Can I drive with code P0024?
You can drive short distances at moderate speeds. The over-advanced exhaust cam timing on bank 2 will cause rough running and reduced power. Avoid hard acceleration and have the vehicle diagnosed promptly.
Is P0024 serious?
It is moderately serious. While it will not cause immediate engine failure, running with incorrect exhaust cam timing can increase exhaust temperatures, reduce catalytic converter life, and cause poor engine performance over time.
Why does this code appear after an oil change?
If the wrong oil viscosity was used, the VVT system may not operate correctly. Also, if the engine had severe sludge buildup, an oil change can dislodge debris that clogs VVT solenoid screens. Verify the correct oil spec and check the solenoid screen.