U352FHigh Voltage System Interlock Circuit J Low
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- 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 In high-voltage plugs the interlock pins are shorter than the power pins, so they part first when the plug is withdrawn.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.
- What you may notice
- High-voltage system switches off and stays off
- No ready mode after work near high-voltage plugs
- Charging not possible
- Likely causes
- LikelyHigh-voltage plug in loop J partly withdrawn, interlock pins already apart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
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.