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Home >> GMC >> 2019 >> Sierra 2500 HD Base, 2D Pickup, Gas >> Repair and Diagnosis >> Engine Mechanical >> Power Takeoff >> Power Take-Off >> Diagnostic Information and Procedures >> DTC P159C >> Circuit/System Testing

Circuit/System Testing

NOTE:

This diagnostic procedure will only diagnose factory installed components. It will not diagnose upfitter provided equipment. If the cover for the frame rail X191 Provisional connector, which includes a jumper wire, is removed DTC P251E may set.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the K44 Power Take - Off Control Module and the K20 Engine Control Module. Remove the frame rail X191 Provisional connector cover. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 1 V between the Power Take Off Engine Shutdown Signal circuit and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  3. Test for infinite resistance between the Power Take Off Engine Shutdown Signal circuit and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If less than 2 Ω 
  4. Test for less than 2 Ω end to end at the Power Take Off Engine Shutdown Signal circuit terminals listed below:
    • K20 Engine Control Module connector X1 terminal 25.
    • K44 Power Take - Off Control Module connector X2 terminal 28.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  5. Test or replace the K20 Engine Control Module.
  6. Verify DTC P159C does not set when operating the vehicle within the conditions for running the DTC.
    • If the DTC sets 

      Replace the K44 Power Take-Off Control Module.

    • Go to next step: If the DTC does not set 
  7. All OK.
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