U351B
High Voltage System Interlock Circuit D Low
U351B is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit D Low. Common causes: open circuit in high voltage blocking circuit, poor contact in the sensor connector. Estimated repair cost: $17–56.
Symptoms
- Check Engine light comes on
- Reduced power or inability to start the engine
- Disabling the High Voltage System
- An error message appears on the dashboard
- Limitation of hybrid system operation
Causes
- Open circuit in high voltage blocking circuit
- Poor contact in the sensor connector
- Short circuit in wiring
- Lock sensor malfunction
- Wiring harness damage
How to Fix
- Check the integrity of the locking circuit
- Inspect connectors and contacts for corrosion or damage
- Check the resistance of the interlock circuit
- Replace the lock sensor if necessary
- Repair only from an authorized dealer
Related codes
Error U351B by Vehicle Brand
FAQ
What does the U351B code mean?
U351B is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit D Low
What causes a U351B error code?
The most common causes of U351B include: Open circuit in high voltage blocking circuit; Poor contact in the sensor connector; Short circuit in wiring; Lock sensor malfunction.
How do I fix a U351B diagnostic trouble code?
To fix U351B: Check the integrity of the locking circuit. Inspect connectors and contacts for corrosion or damage. Check the resistance of the interlock circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U351B?
Do not drive — repair immediately
How much does it cost to fix U351B?
The estimated repair cost for U351B is $17–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat