Intermittent Or Current Service 4WD Lamp - keywords C0306 dtc inoperative mil
| Subject: | Intermittent Or Current Service 4WD lamp |
| Models: | 2006-2007 Hummer H2 |
| Equipped With The Borg-Warner Transfer Case 4484 RPO NR4 |
This PI Supercedes To Updare Recommendation/Instructions. Please Discard PIP4034.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Customers may comment about a Service 4WD light on solid or intermittently. Technicians may discover a C0306 DTC hard set or in history.
Recommendation/Instructions:
This concern may be caused by high resistance through the motor brushes. The highest concentrations of concerns have occurred in geographic locations with low 4WD usage.
If the DTC C0306 is current or in history dealers should clear the DTC from history then cycle the actuator motor 25 times by shifting the transfer case between 4hi, 4hi lock and 4lo lock. A revised interim software reflash is available in TIS2WEB. This software was released to dealers 07/22/07 on version 7.5.
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.
