Camshaft Timing Over-Advanced or System Performance (Bank 2)
Code P0024 indicates that the engine control module (ECM) has detected that the camshaft timing on Bank 2 (the side of the engine opposite cylinder #1) is over-advanced or the variable valve timing (VVT) system is not performing correctly. This can be caused by a faulty VVT solenoid, oil flow issues (low oil pressure, dirty oil, or clogged passages), a stretched timing chain, or a defective camshaft phaser. The ECM monitors camshaft position relative to the crankshaft and sets this code when the actual timing deviates from the commanded timing beyond a threshold.
1. Most Common Causes
- Low engine oil level, incorrect viscosity, or degraded/contaminated oil
- Bank 2 VVT control solenoid (phase actuator) stuck, open, or shorted
- Mechanical failure of the 'B' camshaft phaser (internal wear, stuck sprocket)
- Stretched or jumped timing chain/belt, or failed hydraulic tensioner
- Faulty camshaft position (CMP) or crankshaft position (CKP) sensor with erratic signal
- Open, short, or high resistance in VVT solenoid or sensor wiring/connectors
- Obstructed oil passages in the cylinder head or block preventing hydraulic actuation
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine misfire
- Reduced engine power and acceleration
- Poor fuel economy
- Engine may stall or hesitate
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data. Check for additional codes like P0010-P0014 or P0020-P0024.
Step 2: Inspect engine oil level and condition. Low or dirty oil can cause VVT issues.
Step 3: Test the VVT solenoid on Bank 2 using a multimeter to check resistance (typically 6-14 ohms) and apply 12V to verify operation.
Step 4: Check wiring and connectors for damage, corrosion, or loose connections at the VVT solenoid and ECM.
Step 5: Perform a mechanical timing check to ensure the timing chain/belt is properly aligned and not stretched.
Step 6: If all else is fine, replace the VVT solenoid or camshaft phaser on Bank 2.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with P0024, as advanced timing can cause engine knocking, overheating, or damage to the catalytic converter. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary: replacing a VVT solenoid is $150-$300, while a camshaft phaser replacement can be $400-$800 including labor. Oil change and cleaning may cost $50-$100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.