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8.6 Rear Axle Electronic Locking Differential Inoperative - Service 4WD Indicator DTC C0388 - keywords diff G94 HC4 MIL #PIP3593 - (Oct 19, 2005)
8.6" Rear Axle Electronic Locking Differential Inoperative - Service 4WD Indicator DTC C0388
2006 Hummer H3

Equipped with Electronic Locking Differential (RPO - G94)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A customer may comment that the SERVICE 4WD indicator is illuminated, and the electronic locking rear differential is inoperative. DTC C0388 may be set.

Recommendation/Instructions:
Follow the diagnosis for DTC C0388 (SI Document ID #1537926). If following this diagnosis determines that the locking coil or pigtail has excessive resistance or is shorted to ground, remove the rear axle cover and examine the routing of the pigtail wires to the locking coil. Inspect for wiring damage that may have been caused by the pigtail being routed too close to the ring gear bolts. If wiring damage is observed, replace the locking coil and pigtail assembly.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.