Sierra 3500 Denali 4WD V8-6.0L (2011)
3. Position the engine wiring harness lower electrical connector and engage the retainer (3) securing the lower connector (4) to the ECM.
4. Position the engine wiring harness upper electrical connector and engage the retainer (2) securing the upper connector (1) to the ECM.
5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Single Battery) (See: Starting and
Charging/Battery/Battery Cable/Negative/Service and Repair)Battery Negative Cable Disconnection and Connection (TP2) (See: Starting and
Charging/Battery/Battery Cable/Negative/Service and Repair).
6. If a NEW ECM was installed, program the ECM. Refer to Control Module References (See: Testing and Inspection/Programming and
Relearning/Control Module References).