U353D
High Voltage System Interlock Circuit N
U353D is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit N. Common causes: wire break in the hvil circuit, poor contact in high voltage system connectors. Estimated repair cost: $56–278.
Symptoms
- The Check Engine light comes on
- Reduced power or inability to start the electric motor
- Error message on the car display
- High voltage system blocking
- The car may go into emergency mode
Causes
- Wire break in the HVIL circuit
- Poor contact in high voltage system connectors
- Wiring harness damage
- One of the HVIL limit switches is faulty
- Problems with the high voltage system control unit
How to Fix
- Diagnose the HVIL circuit using a scanner
- Check the integrity of wiring and connectors
- Inspect the interlock circuit limit switches
- Replace damaged circuit components
- Repair only from an authorized dealer
Related codes
Error U353D by Vehicle Brand
FAQ
What does the U353D code mean?
U353D is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit N
What causes a U353D error code?
The most common causes of U353D include: Wire break in the HVIL circuit; Poor contact in high voltage system connectors; Wiring harness damage; One of the HVIL limit switches is faulty.
How do I fix a U353D diagnostic trouble code?
To fix U353D: Diagnose the HVIL circuit using a scanner. Check the integrity of wiring and connectors. Inspect the interlock circuit limit switches. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U353D?
Do not drive — repair immediately
How much does it cost to fix U353D?
The estimated repair cost for U353D is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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