U351EHigh Voltage System Interlock Circuit E Performance
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U351E points to loop E giving results the module cannot trust, and the doubt may concern the monitoring hardware as much as the wiring. Designers do test their own test circuits: CATL first checks its current-generating stage so that a failing source is not blamed on high-voltage parts, and Sanden's interlock at the plug of an electric A/C compressor also recognises defects of the monitoring device and its loop, not only an unplugged connector. A performance code on loop E can therefore come from a drifting source or detector. No maker publishes U351E. Once wiring and plugs test fine, suspect the controller running the loop.
- What you may notice
- High-voltage shutdowns without a recognisable pattern
- Fault returns although wiring and connectors test good
- Possibly further self-test codes in the same controller
- Likely causes
- PossibleCurrent or voltage source for loop E drifting in the controller
- PossibleLoose contact in a loop E connector
- PossibleDetection circuit or its reference faulty
- RareController software with outdated plausibility limits
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.