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I received a P000B code via a diagnostic test at the local Pepboys. Apparently, this is due to a fault/ and or dirty screens on the camshaft position solenoid valves which was released in the TSB PIP-4644 from Saturn to its service departments. Before turning a wrench, is this correct diagnosis on my part? Thanks! Mark

Answers from the Automotive Experts

Amanda J. Pierce, MBA The camshaft position (CMP) actuator is attached to each camshaft and is hydraulically operated in order to change the angle of the camshaft relative to crankshaft position (CKP). The CMP actuator solenoid is controlled by the control module. The control module sends a pulse width modulated signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to a CMP actuator. The CMP actuator can change the camshaft angle a maximum of 20 degrees. The control module increases the pulse width to accomplish the desired camshaft operation. The actual camshaft position does not match the commanded position, in order for this DTC to be set in the ECU. www.motologic.com

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