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Home >> Chevrolet >> 2004 >> Impala LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 791 (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 Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the TAC module.
  2. Ignition ON, test for 8.0-9.0 volts between the signal circuit terminal 4 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the PCM.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.
  3. If all circuits test normal, replace the TAC module.
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