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Home >> Cadillac >> 2018 >> Escalade ESV Platinum, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - 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 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban 3500 HD, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine idling at normal operating temperature.
  2. Verify the scan tool Transmission Control Module Temperature parameter is between -247 and +247°C (-412 and +477°F).
    • If not between -247 and +247°C (-412 and +477°F) 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If between -247 and +247°C (-412 and +477°F) 
  3. Verify the scan tool Transmission Control Module temperature parameter increases greater than 2°C (3.5°F) after operating the vehicle at 64 km/h (40 mph) for 10 minutes.
    • 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 does increase greater than 2°C (3.5°F) 
  4. Verify the scan tool Transmission Control Module Temperature and the Transmission Fluid Temperature parameters are within 10°C (18°F) of each other.
    • If the temperature is not within 10°C (18°F) 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If the temperature is within 10°C (18°F) 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. 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 
  7. All OK.
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