What Does P1528 Mean?
The PCM has detected an abnormally high voltage signal on the intake camshaft position actuator control circuit for Bank 1. This indicates a short to power or open ground preventing the PCM from properly controlling the VVT solenoid.
Common Causes
35%
Wiring harness shorted to battery voltage or another power source
25%
Open or poor ground circuit for VVT solenoid
25%
Failed VVT solenoid with internal short to voltage
10%
Damaged connector with pins touching or bent
5%
PCM internal driver circuit failure providing constant voltage
Diagnostic Steps
1
Step 1: Disconnect VVT solenoid connector; measure voltage on PCM side with key on, should be battery voltage pulsing to ground
2
Step 2: Check ground circuit continuity and resistance from solenoid to PCM; should be less than 1 ohm
3
Step 3: Inspect wiring for damage, especially near alternator, starter, and other high-current components
4
Step 4: Measure resistance of VVT solenoid; verify within specification and no short to voltage internally
5
Step 5: Monitor PCM command vs actual solenoid operation using scan tool data; compare duty cycle to voltage output
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal on the intake camshaft position actuator control circuit for Bank 1. This indicates a short to power or open ground preventing the PCM from properly controlling the VVT solenoid.
The most common cause of P1528 ("A" Camshaft Position Actuator Control Circuit Signal High Bank 1) is: Wiring harness shorted to battery voltage or another power source
Typical repair costs for P1528 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains drivable but will operate with limited or no VVT control, resulting in reduced power, poor fuel economy, and increased emissions. Repair soon to prevent catalyst damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1528 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing System
Difficulty
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