U351E code meaning
High Voltage System Interlock Circuit E Performance
Network system Generic code U35xx codes Check engine light
What U351E means
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.
U351E at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U351E
- High-voltage shutdowns without a recognisable pattern
- Fault returns although wiring and connectors test good
- Possibly further self-test codes in the same controller
Common causes of U351E
- PossibleCurrent or voltage source for loop E drifting in the controller
- PossibleLoose contact in a loop E connector
- PossibleDetection circuit or its reference faulty
- Less likelyController software with outdated plausibility limits
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hvil loop e
What each part of U351E means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 1E | The exact fault in that area. |
What to do next
- Note U351E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U351E
What does U351E mean?
U351E means "High Voltage System Interlock Circuit E Performance". U351E points to loop E giving results the module cannot trust, and the doubt may concern the monitoring hardware as much as the wiring. It is a generic code, so it means the same on every make.
Is it safe to drive with U351E?
Drive gently and only to a workshop. With U351E the car can go into limp mode (reduced power) to protect itself.
Will U351E fail an emissions test?
U351E is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U351E to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will U351E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.