Service Charging System Message onDIC and DTC P0621 - keywords charge fuse generator lamp light message open service system
| Subject: | Service Charging System Message on DIC and DTC P0621 |
| Models: | 2005-2008 Chevrolet Corvette |
| 2004-2008 XLR and XLR-V Series |
This PI was superceded to include 2008 model year. Please discard PIC4536.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment that the Service Charging System message displays on the DIC. Using the Tech2, DTC P0621 is stored. This may be a result of an open in circuit number 2540.
Recommendation/Instructions:
Circuit 2540 is supplied voltage from the Horn fuse, position #2 in the UBEC. Apply the horn to see if it works. If the horn does not work, suspect an open fuse. This fuse may open if the horn is shorted due to water intrusion. If the horn is functional, check the integrity of circuit 2540 between the UBEC and the generator. Refer to SI document 1481125 for the schematic. Repair circuit 2540 as needed and re-evaluate the customers concern.
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.
