Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Yukon XL, 2017 GMC Yukon, 2017 Chevrolet Tahoe, 2017 Chevrolet Suburban 3500 HD, and 2017 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Engine idling at normal operating temperature.
Verify the scan tool Transmission Fluid Temperature parameter is between -74 and +174°C (-101 and +345°F).
- If not between -74 and +174°C (-101 and +345°F)
  Replace the Q8 Control Solenoid Valve Assembly.
- If between -74 and +174°C (-101 and +345°F)
Verify the scan tool Transmission Fluid 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.
- If the temperature does increase greater than 2°C (3.5°F)
Verify the scan tool Transmission Fluid Temperature and the Transmission Control Module Temperature parameters are within 20°C (68°F) of each other.
- If the temperatures are not within 20°C (68°F)
  Replace the Q8 Control Solenoid Valve Assembly.
- If the temperatures are within 20°C (68°F)
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.
Verify the DTC does not set.
- If the DTC sets
  Replace the Q8 Control Solenoid Valve Assembly.
- If the DTC does not set
All OK.