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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1027 (Power Take-Off System) >> Diagnostic Information and Procedures >> DTC P159C (PTO) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the PTO module.
  2. Connect a test lamp between the signal circuit terminal 31 and ground.
  3. Ignition ON, command the PTO remote engine shutdown using the upfitted remote engine shutdown switch. The test lamp should turn ON as the switch is depressed and OFF as the switch is released.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the upfitted remote engine shutdown switch.
    • If the test lamp is always OFF, test the remote engine shutdown switch supply voltage circuit and the signal circuit for a short to ground or an open/high resistance. If both circuits test normal, test or replace the upfitted remote engine shutdown switch.
  4. If all circuits test normal, replace the PTO module.
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