Camshaft Position Actuator Circuit Open - Bank 1 (GM)
What does P1529 mean?
The P1529 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Actuator Circuit Open - Bank 1 (GM). This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Rough idle
- Reduced engine power
- Poor fuel economy
- Engine noise from the valve train area
Probable Causes (Ranked by Likelihood)
- Faulty camshaft position actuator solenoid Very High
- Disconnected or corroded solenoid connector High
- Open wiring between ECM and actuator solenoid Moderate
- Dirty oil clogging the actuator solenoid screen Moderate
- ECM output driver failure Low
Step-by-Step Diagnostic Procedure
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Check the camshaft position actuator solenoid connector for corrosion or disconnection.
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Measure the solenoid resistance. Typical values are 7 to 12 ohms.
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Check oil level and condition. Dirty oil can clog the actuator screen.
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Test the wiring from the ECM to the solenoid for continuity.
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Command the solenoid with a scan tool and listen for clicking or observe oil pressure changes.
Frequently Asked Questions
What is the camshaft position actuator?
It is a solenoid-controlled valve that directs oil pressure to the variable valve timing (VVT) phaser on the camshaft. This adjusts camshaft timing for better performance and efficiency.
Can old oil cause this code?
Yes. The camshaft actuator solenoid has a fine screen that can become clogged by dirty or old oil. Keeping up with regular oil changes is the best preventive measure.
Is this related to the AFM/DOD system on GM trucks?
The camshaft actuator is separate from the Active Fuel Management (AFM/DOD) system, though both are oil-controlled. However, dirty oil can affect both systems.