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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 217 (Rear Drive Axle) >> Diagnostic Information and Procedures >> DTC C0412: Rear Differential Clutch Temperature Sensor Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B260 Rear Differential Oil Pressure/Temperature Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K47 Rear Differential Clutch Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K47 Rear Differential Clutch Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Rear Differential Pump Temperature Sensor parameter is greater than 4.0 V.
    • If 4.0 V or less 
    1. Ignition OFF, disconnect the harness connector at the K47 Rear Differential Clutch Control Module.
    2. Test for infinite resistance between the signal circuit terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K47 Rear Differential Clutch Control Module.
    • If greater than 4.0 V 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  6. Verify the scan tool Rear Differential Pump Temperature Sensor parameter is less than 1.0 V.
    • If 1.0 V or greater 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K47 Rear Differential Clutch Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF
    4. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K47 Rear Differential Clutch Control Module.
    • If less than 1.0 V 
  7. Test or replace the B260 Rear Differential Oil Pressure/Temperature Sensor.
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