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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Displays And Gages) >> Diagnostic Information and Procedures >> DTC P0654 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) creates the engine speed signal by pulsing the circuit to ground. The PCM monitors the voltage on the engine speed signal circuit. If the PCM determines that the voltage is not within the normal operating range, the PCM sets a DTC.

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