U351F code meaning
High Voltage System Interlock Circuit E Low
Network system Generic code U35xx codes Check engine light
What U351F means
U351F reports a low reading on interlock loop E, the usual result when a plug in that loop is separated or one of its wires is grounded. The US standard FMVSS 305a explains the hurry: a high-voltage connector that can be pulled without tools may, as one permitted option, bring its live parts to 60 V DC or less within one second of separation. The interlock gives the early signal for that; Texas Instruments describes the follow-up of stopping traction, opening the power relays and discharging the DC-link capacitors. No maker documents U351F. Expect abrupt loss of drive power and no restart until loop E reads normal.
U351F at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U351F
- Abrupt loss of drive power, often with a stop-safely message
- Vehicle cannot be restarted in ready mode
- Charging aborted or impossible
Common causes of U351F
- Most likelyHigh-voltage plug with interlock in loop E pulled or backed out
- PossibleLoop E wire chafed through to ground
- PossibleInterlock pin pushed back in its housing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hvil loop eHvil wiring
What each part of U351F means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 1F | The exact fault in that area. |
What to do next
- Note U351F 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 U351F
What does U351F mean?
U351F means "High Voltage System Interlock Circuit E Low". U351F reports a low reading on interlock loop E, the usual result when a plug in that loop is separated or one of its wires is grounded. It is a generic code, so it means the same on every make.
Is it safe to drive with U351F?
Drive gently and only to a workshop. With U351F the car can go into limp mode (reduced power) to protect itself.
Will U351F fail an emissions test?
U351F 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 U351F to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U351F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.