| Subject: | Intermittent B1390 |
| Models: | 2005-2006 Buick Terraza |
| 2005-2006 Chevrolet Uplander |
| 2005-2006 Pontiac Montana SV6 |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customer may report an intermittent SVS (Service Vehicle Soon) light illuminated. A routine check with the Tech 2® may find a current and/or history DTC B1390 (Device Voltage Reference Input) present. eSI Document 1748212 may or may not lead the
Technician to a repair. Recently BCM software was added to TIS2000 to increase parameters for setting the trouble code and reduce the occurrence of the B1390.
Recommendation/Instructions:
If published service information does not lead to a repair, complete BCM software download 15872712 in TIS2000.
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.
