P2645 BUICK – Intake Rocker Arm Solenoid Valve 1 Control Circuit

 

P2645: DIY Repairing Video Tutorial

https://youtu.be/_8zsfAp8AWU

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P2645 BUICK Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P2645 BUICK Possible Causes

  Faulty Intake Rocker Arm Solenoid Valve 1,Intake Rocker Arm Solenoid Valve 1 harness is open or shorted,Intake Rocker Arm Solenoid Valve 1 circuit poor electrical connection  

P2645 BUICK Description

  The rocker arm actuator system enables the Engine Control Module (ECM) to change the camshaft lift and duration while the engine is operating. The camshaft has 3 lobes for each intake valve. The inner lobe is for low lift and the 2 outer lobes are for high lift. The rocker arm solenoid valve controls the 2-step lift by controlling the oil flow to the rocker arm. In default mode, a locking pin locks the inner and outer mechanisms of the rocker arm together to provide high lift. When low lift is commanded, oil pressure retracts a locking pin within the rocker arm. The rocker arm solenoid valve receives a signal from the ECM. The ECM controls the rocker arm solenoid valve by supplying a 12 V PWM signal. The ECM supplies a ground to the low reference circuit.