Diagnostic Aids
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the TFT reaches 132°C (270°F). The TFT on the scan tool should rise steadily to a normal operating temperature, and then stabilize.
Ask the customer whether their typical day-to-day driving include:
- Trailer towing
- Hauling or vehicle over-loading
- Hot climate driving
- Extended idling
- Extreme off-road conditions
Trailer towing should occur in D4. Ensure the engine cooling system is functioning normally.