Complaint Check engine light comes on when driving/starting the vehicle

Bulletin number

LI54.21-P-078926

Component

Engine

Summary

Complaint Check engine light comes on when driving/starting the vehicle. No drivability concerns. Cause SW conflict of the 48V battery Remedy 1.-Check for SW in the 48V battery. 1. If SW is available, update the 48V battery. 2. Clear all faults and perform a few drive cycles. 3. If no faults return, the vehicle can be released. 2.-If no SW available, perform the following: - Charge the batteries (<5A charging current) - Erase the fault codes - Access the 12V battery contacts - Ignition off and bus sleep for 10 minutes - Disconnect the 12V battery - Wait 10 minutes - Disconnect Connector 3 at the 48V battery - Disconnect Connector 5 at the DCDC converter - Disconnect the 48V and 12V contacts (40/41 and 30/31) at the DCDC converter - Wait for 10 minutes - Reconnect everything back in opposite order and perform the ISU of the DCDC - Conduct a test drive and after check for fault codes U014687 and U044287

Owners of these vehicles have filed 21 complaints in the engine category.