What does code U3538 mean?

Q: What does code U3538 mean?

High Voltage System Interlock Circuit L High. U3538 indicates that the high-voltage interlock loop circuit for the 'L' segment is reporting a voltage above the expected threshold, which the vehicle's control module interprets as a potential safety hazard. The interlock is a low-voltage loop that runs through high-voltage connectors and covers; when its voltage is too high, the module sets this code to prevent high-voltage exposure.

DTC codes / U35xx · Network communication / U3538

U3538High Voltage System Interlock Circuit L High

U3538 indicates that the high-voltage interlock loop circuit for the 'L' segment is reporting a voltage above the expected threshold, which the vehicle's control module interprets as a potential safety hazard. The interlock is a low-voltage loop that runs through high-voltage connectors and covers; when its voltage is too high, the module sets this code to prevent high-voltage exposure.

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.