What does code U3528 mean?

Q: What does code U3528 mean?

High Voltage System Interlock Circuit G High. U3528 indicates that the vehicle's high-voltage interlock loop, specifically circuit G, has reported a voltage level above the expected threshold. The interlock is a safety circuit that confirms all high-voltage connectors and covers are properly seated before the battery pack is allowed to energize, and this code means the control module sees an abnormally high voltage on that particular segment of the loop.

DTC codes / U35xx · Network communication / U3528

U3528High Voltage System Interlock Circuit G High

U3528 indicates that the vehicle's high-voltage interlock loop, specifically circuit G, has reported a voltage level above the expected threshold. The interlock is a safety circuit that confirms all high-voltage connectors and covers are properly seated before the battery pack is allowed to energize, and this code means the control module sees an abnormally high voltage on that particular segment of the loop.

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.