U351A
High Voltage System Interlock Circuit D Performance
U351A is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit D Performance. Common causes: broken or damaged hvil circuit wires, corrosion or oxidation of contacts in connectors. Estimated repair cost: $17–111.
Symptoms
- Malfunction indicator lamp (MIL) lights up
- Possible problems starting the car
- Power loss or high voltage system failure
- Error message on the dashboard
- The car may go into emergency mode
Causes
- Broken or damaged HVIL circuit wires
- Corrosion or oxidation of contacts in connectors
- Malfunction of the interlock circuit monitoring module
- Mechanical damage to high voltage system components
- High Voltage System Grounding Problems
How to Fix
- Check the integrity of the HVIL wiring harness
- Inspect all high-voltage system connectors for damage.
- Check the resistance of the interlock circuit
- Diagnose the blocking circuit control module
- Repair only from an authorized dealer
Related codes
Error U351A by Vehicle Brand
FAQ
What does the U351A code mean?
U351A is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit D Performance
What causes a U351A error code?
The most common causes of U351A include: Broken or damaged HVIL circuit wires; Corrosion or oxidation of contacts in connectors; Malfunction of the interlock circuit monitoring module; Mechanical damage to high voltage system components.
How do I fix a U351A diagnostic trouble code?
To fix U351A: Check the integrity of the HVIL wiring harness. Inspect all high-voltage system connectors for damage.. Check the resistance of the interlock circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U351A?
Do not drive — repair immediately
How much does it cost to fix U351A?
The estimated repair cost for U351A is $17–111. Actual cost depends on your vehicle, location, and labor rates.
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