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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 10L80 (MHS MHU MQC) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> DTC P189C >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector: LIN Bus 1
    • K20 Engine Control Module
    • K71 Transmission Control Module
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for less than 1 V between the test points: Serial Data circuit terminal 31@K71 Transmission Control Module & The other end of the circuit
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  5. Ignition/Vehicle - Off
  6. Test for infinite resistance between the test points: Serial Data circuit terminal 31@K71 Transmission Control Module & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  7. Test for less than 10 ohms between the test points: Serial Data circuit terminal 31@K71 Transmission Control Module & The other end of the circuit
    • If greater than 10 ohms 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 10 ohms 
  8. Replace the component: K71 Transmission Control Module
  9. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component: K20 Engine Control Module

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