B Camshaft Timing Over-Retarded (Bank 1)

The engine's computer is seeing that the intake camshaft on bank one is not advancing when it should, impacting performance and emissions.

The ECM expects the camshaft timing to be within a specific range based on RPM and load, but it's sensing a delay or failure in the timing mechanism.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check the engine oil level and condition (should be clean and at the correct level).
2. 2Inspect the VVT actuator solenoid connector and wiring for corrosion or damage.
3. 3Measure the resistance of the VVT sensor; it should be within manufacturer specs (typically around 5-10 ohms).
4. 4If previous steps are good, check the camshaft timing with a scanner or timing light; compare against expected values.
5. 5If timing is off, inspect the timing chain/belt for wear or skip and verify the phaser operation.

• Oil starvation due to low oil level or dirty oil
• Faulty VVT sensor
• Defective camshaft phaser
• Timing chain/belt issues
• Wiring or connector problems to the VVT system

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