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Home >> Cadillac >> 2019 >> XTS Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Automatic Transmission - 6T70 (M7U M7W), 6T75 (M7V), Or 6T80 (Mhm) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0667, P0668, or P0669 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Cadillac XTS. 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 is between -249 and +249°C (-416 and +480°F).
    • If not between -249 and +249°C (-416 and +480°F) 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If between -249 and +249°C (-416 and +480°F) 
  3. Verify the scan tool TCM Temperature parameter increases greater than 2°C (3.5°F) after operating the vehicle at 64 km/h (40 mph) for 10 min.
    • If the temperature does not increase greater than 2°C (3.5°F) 

      Replace the Q8 Control Solenoid Valve Assembly

    • Go to next step: If the temperature increases greater than 2°C (3.5°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

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