What does code U3508 mean?

Q: What does code U3508 mean?

Control Module Input Power C Circuit Range/Performance. This code means the engine control module (ECM) or another control module has detected that the voltage supplied to its internal power circuit, identified as circuit C, is outside the range the manufacturer expects for proper operation. The module is not reporting a complete failure of power, but rather that the voltage it sees on that feed is too high, too low, or unstable during self-checks, which can affect how reliably the module runs its internal diagnostics and control functions.

DTC codes / U35xx · Network communication / U3508

U3508Control Module Input Power C Circuit Range/Performance

This code means the engine control module (ECM) or another control module has detected that the voltage supplied to its internal power circuit, identified as circuit C, is outside the range the manufacturer expects for proper operation. The module is not reporting a complete failure of power, but rather that the voltage it sees on that feed is too high, too low, or unstable during self-checks, which can affect how reliably the module runs its internal diagnostics and control functions.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.