P2651 Possible Causes
- Low or overfilled engine oil
- Incorrect engine oil type
- Faulty rocker arm actuator “B”
- Rocker arm actuator “B” circuit open or shorted
- Poor electrical connection in rocker arm actuator “B” circuit
How to Fix Code P2651
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Engine light on (or service engine soon warning light)
P2651 Meaning
The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator circuit and sets OBDII when the rocker arm actuator “B” circuit is outside factory specifications.