Diagnostic Aids
WARNING: This page is about a different car, the 2017 GMC Yukon XL, 2017 GMC Yukon, 2017 Chevrolet Tahoe, and 2017 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
- DTC P0601 detects a non-volatile memory write error (ROM).
- DTC P0602 indicates that the transmission control module is not programed.
- DTC P0604 detects the wrong copy of non-volatile memory in RAM or a RAM read/write failure.
- DTC P0606 00 detects a processor performance failure.
- DTC P0606 37 detects a software malfunction.
- DTC P062F detects a corruption of the EPROM/Flash memory.
- DTC P064F detects an invalid calibration.
- Low voltage or a momentary loss of power or ground to the transfer case control module may cause a DTC to set. Verify the following:
- The battery cables are clean and tight, and the battery is fully charged. Refer to Battery Inspection/Test .
- The transfer case control module ground circuits do not have an open or high resistance.
- The transfer case control module power circuits do not have an open, short to ground, or high resistance.