P0025 – Exhaust Camshaft Position Timing Over-Retarded (Bank 2)

P0025 – Exhaust Camshaft Position Timing Over-Retarded (Bank 2)

The P0025 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected that the exhaust camshaft timing on Bank 2 is more retarded than the specified value. This usually occurs due to a malfunction in the Variable Valve Timing (VVT) system, improper engine oil flow, or incorrect mechanical valve timing.

Symptoms of P0025

• Check Engine Light illuminated.
• Rough or unstable idle.
• Poor engine performance.
• Slow acceleration.
• Increased fuel consumption.
• Engine hesitation or stalling.
• Possible engine noise from the timing chain area.

Common Causes

• Low, dirty, or incorrect engine oil.
• Faulty VVT oil control valve (OCV).
• Stuck camshaft phaser.
• Stretched timing chain or worn timing components.
• Faulty camshaft position sensor.
• Restricted oil passages.
• Damaged wiring or poor electrical connections.
• Incorrect engine mechanical timing.

How to Diagnose P0025

1. Check the engine oil level, condition, and viscosity.
2. Scan for additional diagnostic trouble codes.
3. Inspect the VVT oil control valve and electrical connector.
4. Monitor camshaft timing data using a scan tool.
5. Inspect the timing chain and timing marks.
6. Test the camshaft position sensor.
7. Inspect the engine wiring harness for damage.

Possible Repairs

• Replace engine oil and oil filter.
• Replace the faulty VVT oil control valve.
• Replace a defective camshaft position sensor.
• Repair damaged wiring or connectors.
• Replace the timing chain and worn timing components.
• Correct the engine mechanical timing.

Can You Drive With Code P0025?

Driving with code P0025 is not recommended. Continued operation may reduce engine efficiency, increase fuel consumption, and eventually cause severe engine damage if the timing chain or VVT system fails.

Estimated Repair Cost

• Oil and filter change: $30–$100
• VVT oil control valve replacement: $100–$350
• Camshaft position sensor replacement: $50–$250
• Timing chain replacement: $600–$2,500

Related Trouble Codes

• P0014 – Exhaust Camshaft Timing Over-Advanced (Bank 1)
• P0024 – Exhaust Camshaft Timing Over-Advanced (Bank 2)
• P0021 – Intake Camshaft Timing Over-Advanced (Bank 2)
• P0022 – Intake Camshaft Timing Over-Retarded (Bank 2)
• P0019 – Crankshaft/Camshaft Correlation (Bank 2 Sensor B)