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: Communication error in G1/3 - 48 V on-board electrical system battery (48 V LIB) or N127 - 'Drivetrain' control unit (PTCU)saved and/or current Remedy: Update the software for the control unit G1/3 - 48 V on-board electrical system battery (48 V LIB) : --> Remedy-SW A001902042425/12 If the fault profile still occurs with the installed software, check the wiring and the plug contacts: UG1/3 - 48 V on-board electrical system battery (48 V LIB) N83/1 - DC/DC converter (DDW) N127 - 'Drivetrain' (PTCU) control unit NOTE: Replacing parts does not remedy the problem.

Owners of these vehicles have filed 40 complaints in the engine category.