Rocker Arm Actuator Control Circuit Low Bank 2
The P2658 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the rocker arm actuator control circuit for Bank 2. This actuator controls the variable valve timing or cylinder deactivation system. 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 affect engine performance and fuel economy.
1. Most Common Causes
- Engine oil in poor condition or incorrect level
- Damaged or internally shorted rocker arm actuator solenoid
- Actuator circuit wiring shorted to ground
- Loose, corroded, or poor electrical connections
- Faulty PCM (rare, but possible)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power loss
- Rough idle or misfire
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the wiring and connector for Bank 2 rocker arm actuator for damage, corrosion, or loose connections.
Step 3: Measure the voltage at the actuator connector with the engine running; compare to manufacturer specifications.
Step 4: Test the actuator resistance with a multimeter; replace if out of spec.
Step 5: If wiring and actuator are good, check for PCM issues or perform a continuity test from PCM to actuator.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine performance issues and potential damage to the valve train. Have it diagnosed promptly.
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 actuator or PCM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.