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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information And Procedures >> DTC P17D4, P185F, P279A, P279B, P279C: Transfer Case (L83) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON/Vehicle in Service Mode
  2. Verify DTC P0502, P0503, P0721, P0722, P0723, P077C, P077D, P2160 or P2161 is not set as current or in history
    • Go to next step: If none of the DTCs are set 
  3. Ignition ON, engine running for greater than 1 min.
  4. Ignition OFF for greater than 2 min, key out of the ignition/keyless start transmitter 1 m (3 ft) away from the vehicle and all vehicle systems OFF.
  5. Ignition ON/Vehicle in Service Mode
  6. Verify DTC P17D4, P185F, P279A, P279B, P279C is only set as a history DTC.
    • If any of the DTCs are set as current. 

      Refer to Circuit/System Testing below

    • Go to next step: If none of the DTCs are set 
  7. Clear All Vehicle DTCs.
  8. Drive the vehicle at a speed greater than 10 km/h (6 mph) and verify the following parameters match the actual vehicle speed and each other. Both parameters should show a smooth/steady curve when viewed in graph form:
    • Transmission OSS scan too parameter in the Transmission Control Module scan tool data list
    • Transfer Case OSS scan too parameter in the Engine Control Module scan tool data list
    • Go to next step: If the above parameters match and are smooth 
  9. All OK.
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