This code indicates that the engine control module has detected a performance problem in the exhaust valve control circuit for cylinder 6. It typically relates to cylinder deactivation systems that electronically control exhaust valve operation to improve fuel efficiency. The PCM monitors the circuit and sets this code when the circuit behaves outside expected parameters.
The solenoid/actuator responsible for controlling the exhaust valve on cylinder 6 can fail electrically or mechanically. This is the most common cause of this specific circuit performance code.
Corroded, chafed, or loose wiring and terminals in the circuit between the solenoid and PCM can cause intermittent or poor electrical performance. Heat and vibration near the engine commonly degrade these connections.
The exhaust valve control solenoid relies on proper oil pressure and clean oil flow. Sludge, debris, or wrong oil viscosity can prevent the solenoid from operating correctly, triggering a performance code.
A collapsed lifter, bent pushrod, or stuck valve can prevent the exhaust valve control system from functioning as commanded, causing the PCM to detect a performance issue in the circuit.
Internal driver circuit failure in the engine control module is rare but possible. This should only be considered after all other components and wiring have been thoroughly verified.
Short trips may be possible, but continued driving risks catalytic converter damage from unburned fuel if a misfire develops. Have it diagnosed promptly to avoid more costly repairs.
No. PCM failure is the least likely cause. Many drivers are told to replace the PCM for this code, but the solenoid, wiring, or oil supply issue is far more common. Only consider the PCM after all other causes are verified as good.
It can be. The exhaust valve control solenoid depends on clean oil at the correct pressure and viscosity. Dirty oil, wrong viscosity, or low oil level can trigger this code. An oil change with the correct specification may resolve it if contamination is the root cause.
It often does, since the solenoid is the most common failure point. However, proper diagnosis is important because wiring issues or oil supply problems can produce the same code and will cause a new solenoid to fail as well.