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Home >> Pontiac >> 2007 >> Grand Prix Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0608 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the throttle actuator control (TAC) module.
  2. Ignition ON, test for 8.5V between the vehicle speed signal terminal 4 and ground.
    • If less than the specified value, test the vehicle speed signal circuit for an open or short to ground. If the circuit tests normal, replace the PCM.
    • If greater than the specified value, test the vehicle speed signal circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  3. If all circuits test normal, replace the TAC module.
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