U352EHigh Voltage System Interlock Circuit J Performance
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U352E reports an implausible result from loop J. Interlocks also guard auxiliary drives outside the traction system. Copeland patented a contactless version for the inverter of a trailer refrigeration unit, which may be fed from a 460 V generator through a rectifier at about 650 V DC: a magnet on each terminal cover faces a Hall sensor in the housing, and the drive releases voltage only while that field is sensed. The patent wants the detection range small, so a cover sitting slightly askew, a deformed gasket or a loosened magnet screw can leave the sensor near its switching point and let the reading flicker. No maker documents U352E. The drive on loop J may cut out at random.
- What you may notice
- High-voltage consumer on loop J switching off intermittently
- Fault more frequent on rough roads or after work on covers
- High-voltage system warning that comes and goes
- Likely causes
- PossibleCover with interlock sensing seated unevenly or gasket deformed
- PossibleLoose contact in a loop J connector
- RareSensing element or its actuating magnet loose or damaged
- RareSignal input of the evaluating controller faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.