Conditions for Setting the DTC
WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The transfer case shift control module detects continued readings of front and rear propshaft speed signal which do not match. The module is unable to determine propshaft speed.
The system will log the DTC if the front and rear propshaft inputs indicates a speed greater than 20% difference for 40 seconds while all of the following are true:
- Transmission NOT in Park/Neutral
- Engine is running
- Front axle is engaged
- Front Propshaft indicates speed less than 75 mph
- Front Propshaft or Rear Propshaft speed exceeds 512 RPM
- Vehicle Speed On Class 2 Data bus exceeds 16 kph (10 mph)