U352BHigh Voltage System Interlock Circuit H Low
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U352B reports too low a level on interlock loop H. Apart from a pulled plug or a grounded wire, a deliberate opening can cause it: Texas Instruments mentions feeding a crash signal into the loop so that high voltage shuts off after an accident. The DGUV warns that such a crash shutdown does not establish absence of voltage and that disconnection following the maker's rescue sheet is still advisable; FMVSS 305a takes its post-crash voltage readings in a window from 10 s to one minute after the impact. No maker documents U352B. After a collision, replace damaged loop sections rather than patching them, and have trained staff isolate the system.
- What you may notice
- High voltage off after an accident or airbag deployment
- Vehicle cannot be made ready
- Likely causes
- PossibleLoop H opened on purpose by a crash signal after an accident
- PossibleLoop H wiring or plug damaged in a collision
- PossibleLoop H wire shorted to ground
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.