U353DHigh Voltage System Interlock Circuit N
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U353D is the general code for interlock circuit N, the thirteenth loop in J2012 lettering; designs with that many loops are only conceivable on very large high-voltage systems. No maker documents U353D publicly. Moisture is a frequent root cause on interlocks of any letter: FCA bulletin 08-131-21 for the 2021 Jeep Wrangler plug-in hybrid traces a no-start with P0A0A to water getting past a pinched orange seal into the P1 and P2 HV connectors under the car, often logged together with an isolation fault (P0AA6). Where corrosion has set in, the harness or the power inverter module has to be replaced. Inspect seals before cleaning pins.
- What you may notice
- No ready mode or no start, often after rain, washing or wading
- Isolation fault stored alongside the interlock code
- Hybrid or high-voltage system warning in the cluster
- Likely causes
- LikelyWater in a loop N connector because a seal is pinched or damaged
- PossibleConnector in loop N not fully seated
- PossibleInterlock pins corroded after earlier moisture
- RareController that drives and reads loop N faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.