What does code U351C mean?

Q: What does code U351C mean?

High Voltage System Interlock Circuit D High. U351C indicates that the high-voltage system interlock circuit D is reporting a voltage higher than the manufacturer's expected range, which the computer detects as an abnormal signal on that specific interlock loop. The interlock is a safety circuit that confirms high-voltage connectors and covers are properly seated before the vehicle allows high-voltage operation.

DTC codes / U35xx · Network communication / U351C

U351CHigh Voltage System Interlock Circuit D High

U351C indicates that the high-voltage system interlock circuit D is reporting a voltage higher than the manufacturer's expected range, which the computer detects as an abnormal signal on that specific interlock loop. The interlock is a safety circuit that confirms high-voltage connectors and covers are properly seated before the vehicle allows high-voltage operation.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.