B Camshaft Position Actuator Circuit Bank 1
The Engine Control Module (ECM) detected an open or short circuit in the Bank 1 Exhaust (B) camshaft position actuator solenoid circuit. This means the computer cannot properly control the exhaust valve timing on the bank of cylinders containing cylinder 1.
While the vehicle will usually still run, the variable valve timing system will be disabled. This can lead to poor performance, reduced fuel economy, and potential stalling, so it should be diagnosed soon.
Common symptoms
- Illuminated Check Engine Light (MIL)
- Rough idle or stalling
- Decreased engine power and performance
- Reduced fuel economy
- Hard starting condition
Likely causes
- Faulty Bank 1 Exhaust (B) camshaft position actuator solenoid (VVT solenoid)
- Damaged, corroded, or loose wiring connector at the VVT solenoid
- Open or shorted wiring in the VVT solenoid circuit
- Low engine oil level or dirty engine oil causing secondary VVT issues
- Faulty Engine Control Module (ECM) (rare)
What to check before replacing parts
Check the engine oil level and condition.
Look for: Low or excessively dirty oil can cause VVT system issues. While P0013 is an electrical code, ensuring proper oil pressure and condition is a necessary baseline step for any VVT diagnosis.
Visually inspect the Bank 1 Exhaust VVT solenoid connector and wiring.
Look for: Look for broken wires, melted insulation, pushed-out pins, or corroded terminals that would cause an open or short circuit.
Measure the resistance of the Bank 1 Exhaust VVT solenoid using a multimeter.
Look for: Compare the resistance value to factory specifications (usually between 8-15 ohms). An infinite reading (OL) indicates an open internal coil, meaning the solenoid must be replaced.
Check for voltage and ground at the VVT solenoid connector with the key on.
Look for: A lack of 12V power or control ground from the ECM indicates a wiring harness issue, a blown fuse, or an ECM fault.
Command the VVT solenoid on and off using a bi-directional scan tool.
Look for: Listen for an audible click from the solenoid and monitor the circuit status on the scanner to verify if the ECM can actively control the circuit without setting a fault.
This page explains the generic P0013 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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