U352F code meaning
High Voltage System Interlock Circuit J Low
Network system Generic code U35xx codes Check engine light
What U352F means
U352F means loop J reads below its lower threshold, the picture an interrupted loop gives. In high-voltage plugs the interlock pins are shorter than the power pins, so they part first when the plug is withdrawn. A TE Connectivity product manager puts the resulting lead at just one to three milliseconds for a plug pulled quickly, while switching the whole system off can take close to a second, and adds that a closed loop does not prove full mating. A Hyundai and Kia connector patent names the same weakness of fast separation. A plug in loop J that has been pulled back slightly, or a dropped interlock pin, is thus the first suspect. No maker lists U352F; the contactors stay open.
U352F 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 U352F
- High-voltage system switches off and stays off
- No ready mode after work near high-voltage plugs
- Charging not possible
Common causes of U352F
- Most likelyHigh-voltage plug in loop J partly withdrawn, interlock pins already apart
- PossibleInterlock pin in loop J pushed back in its cavity
- PossibleLoop J wire chafed through to ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hvil loop jHvil wiring
What each part of U352F means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 2F | The exact fault in that area. |
What to do next
- Note U352F 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 U352F
What does U352F mean?
U352F means "High Voltage System Interlock Circuit J Low". U352F means loop J reads below its lower threshold, the picture an interrupted loop gives. It is a generic code, so it means the same on every make.
Is it safe to drive with U352F?
Drive gently and only to a workshop. With U352F the car can go into limp mode (reduced power) to protect itself.
Will U352F fail an emissions test?
U352F 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 U352F to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U352F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.