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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 358 (Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0667, P0668, or P0669: Control Module Temperature Sensor >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool TCM Temperature parameter increases greater than 2°C (3.6°F) after operating the vehicle at 64 km/h (40 mph) for 10 min.
    • If the temperature does not increase greater than 2°C (3.6°F) 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If the temperature increases greater than 2°C (3.6°F) 
  3. Verify the scan tool Transmission Fluid Temperature and TCM Temperature parameters are within 20°C (36°F) of each other.
    • If the temperatures are not within 20°C (36°F) 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If the temperatures are within 20°C (36°F) 
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If the DTC does not set 
  6. All OK.
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