Conditions for Setting the DTC
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. 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 10% difference for 40 seconds while all of the following are true:
- The transmission is NOT in Park/Neutral.
- The engine is running.
- The front axle is engaged.
- The front propshaft indicates speed less than 75 mph.
- Vehicle Speed On Class 2 Data bus exceeds 16 km/h (10 mph).