P2090: B Camshaft Position Actuator Control Circuit Low Bank 1
The P2090 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the control circuit for the 'B' camshaft position actuator on Bank 1. This actuator is responsible for adjusting camshaft timing to optimize engine performance and emissions. A low circuit condition typically means the voltage is below the expected range, often due to a short to ground, faulty actuator, or wiring issues. This can lead to improper camshaft timing, affecting engine power, fuel economy, and emissions.
01. Most Common Causes
- Faulty camshaft position actuator solenoid
- Short to ground in the actuator control circuit
- Open or damaged wiring/connectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine misfire
- Reduced engine power and fuel economy
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the actuator solenoid resistance and compare to specs (typically 6-12 ohms).
Step 4: Check for voltage and ground at the actuator connector using a multimeter.
Step 5: If wiring and actuator are good, test PCM output or consider PCM failure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor engine performance, increased emissions, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the PCM needs replacement.