| Subject: | Camper / Trailer Battery Charging |
| Models: | 2005-2007 Cadillac Escalade, EXT, ESV |
| 2005-2007 Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe |
| 2005-2007 GMC Sierra, Sierra Classic, Yukon, Yukon Denali, Yukon Denali XL |
| With Regulated Voltage Control (RVC) |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment that when towing or hauling a camper/trailer that their auxiliary battery for the camper/trailer battery will not stay charged. In most cases, this concern is blamed on the new Regulated Voltage Control (RVC) system. While the
new RVC system does reduce the generators targeted output voltage to 12.6-13.1 volts when in "Fuel Economy Mode", this feature is bypassed if the tow/haul feature is enabled. With the tow/haul feature enabled the system will stay in "Charge Mode" and the targeted
generator output voltage will be 13.9-15.5 volts, depending on the battery state of charge and estimated battery temperature.
Recommendation/Instructions:
To correct this concern while towing or hauling a camper/trailer use the Tow/Haul feature.
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.
