What Does P2090 Mean?
The exhaust camshaft (B cam) position actuator control circuit on Bank 1 is reading lower voltage than expected. The PCM cannot properly control variable valve timing on the exhaust cam due to low circuit voltage.
Common Causes
35%
Faulty exhaust cam phaser solenoid with internal short
25%
Corroded or loose connector at cam actuator solenoid
20%
Open or high resistance in solenoid control wiring
15%
Poor ground connection at solenoid or valve cover
5%
Failed PCM driver circuit for cam actuator
Diagnostic Steps
1
Step 1: Inspect cam phaser solenoid connector for oil contamination or corrosion
2
Step 2: Measure resistance of exhaust cam solenoid; compare to specifications
3
Step 3: Check voltage at solenoid connector with engine running and commanded active
4
Step 4: Verify ground circuit continuity from solenoid to PCM or engine ground
5
Step 5: Monitor cam phaser duty cycle and actual vs commanded cam position with scan tool
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The exhaust camshaft (B cam) position actuator control circuit on Bank 1 is reading lower voltage than expected. The PCM cannot properly control variable valve timing on the exhaust cam due to low circuit voltage.
The most common cause of P2090 (B Camshaft Position Actuator Control Circuit Low Bank 1) is: Faulty exhaust cam phaser solenoid with internal short
Typical repair costs for P2090 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driveable but may experience reduced power, poor fuel economy, and rough idle. Can cause catalytic converter damage if left unrepaired long-term.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2090 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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