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P2646 is a diagnostic trouble code (DTC) for "'A' Rocker Arm Actuator System Performance / Stuck Off Bank 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
'A' Rocker Arm Actuator System Performance or Stuck Off Bank 1
P2646 is an OBD-II generic code for the engine control module (ECM) detecting the 'A' rocker arm actuator control circuit for bank 1 has a performance problem or is stuck in the off position.
Code P2646 is a code for the 'A' rocker arm control circuit performance problem. When the system is not working correctly, the rocker arms are not moving to the different position causing a low power situation.
Code P2646 is not a very common code since most vehicles do not have actuators for the rocker arms of the engines they manufacture. The vehicles that have variable rockers that use this code are known to get this code when the engine gets sludged up from lack of oil changes at the proper interval, or if the oil is too thick of a viscosity and does not flow properly through the small passages as required. Normal oil change intervals with the correct oil viscosity will usually fix most of these codes if the engine is not too sludged up.
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