K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Steps 11-18
The numbers below refer to the step numbers on the diagnostic table.
2. A partial loss of communication in the class 2 serial data circuit uses a different procedure than a total loss of communication of the class 2 serial
data circuit.
4. The following DTCs may be retrieved with a history status. These DTCs are not the cause of the present condition.
^
U1300
^
U1301
^
U1305
6. A State of Health DTC with a history status may be present along with a U1000 or U1255 with a current status. This indicates that the malfunction
occurred when the ignition was on.
10. Normal class 2 serial data communication cannot take place until the power mode master (PMM) module sends the appropriate power mode