Conditions For Setting DTC
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
System will set DTC when ATC control module detects continued readings of front and rear drive shaft RPM signals that do not match. Control module cannot determine drive shaft speed.
System will set this DTC if front and rear drive shaft inputs indicate speed of less than 20 percent difference for 40 seconds when the following conditions exists:
- Transmission is not in Park or Neutral.
- Engine is running.
- Front axle is engaged.
- Front drive shaft indicates speed less than 75 MPH.
- Front or rear drive shaft speed exceeds 512 RPM.
- Vehicle speed on Class 2 Data Bus exceeds 10 MPH.
This condition will disable all shifts to AUTO mode. System will not allow any further adaptive events (slip correction). SERVICE 4WD light will be on for remainder of current ignition cycle.