P0025: Camshaft Position Timing Over-Retarded (Bank 2)
The P0025 code indicates that the engine control module (ECM) has detected that the camshaft timing on bank 2 is retarded (delayed) beyond the specified range. This typically occurs in engines with variable valve timing (VVT) systems. The ECM monitors the camshaft position sensor and compares it to the crankshaft position sensor to ensure proper timing. When the camshaft is over-retarded, it can cause reduced engine performance, increased emissions, and potential engine damage if not addressed.
01. Most Common Causes
- Faulty camshaft position sensor on bank 2
- Worn or stretched timing chain/belt
- Faulty variable valve timing (VVT) solenoid or oil control valve
- Low engine oil level or dirty oil causing VVT actuator malfunction
- Worn timing chain tensioner or guides
- Incorrect camshaft timing due to improper installation
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine misfire
- Reduced engine power and acceleration
- Poor fuel economy
- Engine may run rich or lean, causing increased emissions
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data to confirm P0025 and check for related codes.
Step 2: Inspect engine oil level and condition; change oil and filter if dirty or low.
Step 3: Visually inspect the timing chain/belt and tensioner for wear or slack.
Step 4: Test the camshaft position sensor on bank 2 using a multimeter or oscilloscope.
Step 5: Check the VVT solenoid/oil control valve for proper operation and clean or replace if necessary.
Step 6: If all else fails, perform a mechanical timing check to ensure the camshaft and crankshaft are aligned correctly.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with P0025, as it can cause poor engine performance, increased emissions, and potential damage to the timing components or engine. You should have it diagnosed and repaired as soon as possible.
How much does it cost to fix?▼
The cost to fix P0025 varies depending on the root cause. A simple oil change or sensor replacement may cost $150-$250, while timing chain or VVT component repairs can range from $400 to $1,500 or more.