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 test motor circuits as follows:
- First, system checks for unwanted voltage.
- Then, system supplies voltage on one circuit and read voltage back on other circuit.
- If system detects a problem, DTC is set.
- ATC control module senses low voltage return on either circuit when a high voltage signal is expected.
When this DTC is set, all shifting will be disabled. If currently in AUTO, system will not allow any further adaptive events (slip corrections). SERVICE 4WD light will be on for remainder of current ignition cycle.