U353B
High Voltage System Interlock Circuit M Low
U353B is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit M Low. Common causes: broken or damaged interlock circuit wiring, high voltage lockout sensor malfunction. Estimated repair cost: $56–278.
Symptoms
- Hybrid/electric system does not activate
- The warning light on the dashboard comes on
- The car goes into emergency mode
- Decreased power or inability to move
- Error message on display
Causes
- Broken or damaged interlock circuit wiring
- High Voltage Lockout Sensor Malfunction
- Short circuit to ground
- Problems with the HV system control module
- Corrosion or poor contact in connectors
How to Fix
- Check the integrity of the interlock circuit wiring
- Check the resistance and voltage of the lock sensor
- Inspect connectors and contacts for corrosion
- Check the functionality of the HV system control module
- Repair only from an authorized dealer
Related codes
Error U353B by Vehicle Brand
FAQ
What does the U353B code mean?
U353B is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit M Low
What causes a U353B error code?
The most common causes of U353B include: Broken or damaged interlock circuit wiring; High Voltage Lockout Sensor Malfunction; Short circuit to ground; Problems with the HV system control module.
How do I fix a U353B diagnostic trouble code?
To fix U353B: Check the integrity of the interlock circuit wiring. Check the resistance and voltage of the lock sensor. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U353B?
Do not drive — repair immediately
How much does it cost to fix U353B?
The estimated repair cost for U353B is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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