Conditions for Setting the DTC

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The DIC receives a class 2 message from the PCM indicating a vehicle speed of greater than 3 km/h (1.86 mph).
The DIC detects a loss of vehicle speed on the vehicle speed signal circuit.
The above condition is present for greater than 15 seconds.