U351D
High Voltage System Interlock Circuit E
U351D is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit E. Common causes: open or short circuit in the interlock circuit, poor contact in high voltage system connectors. Estimated repair cost: $56–222.
Symptoms
- The malfunction indicator on the dashboard lights up
- The car may go into emergency mode
- Reduced power or inability to start
- Disabling the High Voltage System
- Errors in other high voltage systems
Causes
- Open or short circuit in the interlock circuit
- Poor contact in high voltage system connectors
- Lock sensor malfunction
- Wiring harness damage
- Problems in the high voltage system control module
How to Fix
- Visual inspection of high voltage system wiring and connectors
- Checking the integrity of the interlock circuit
- Testing blocking sensors
- Replacing damaged components
- Repair only from an authorized dealer
Related codes
Error U351D by Vehicle Brand
FAQ
What does the U351D code mean?
U351D is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit E
What causes a U351D error code?
The most common causes of U351D include: Open or short circuit in the interlock circuit; Poor contact in high voltage system connectors; Lock sensor malfunction; Wiring harness damage.
How do I fix a U351D diagnostic trouble code?
To fix U351D: Visual inspection of high voltage system wiring and connectors. Checking the integrity of the interlock circuit. Testing blocking sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U351D?
Do not drive — repair immediately
How much does it cost to fix U351D?
The estimated repair cost for U351D is $56–222. Actual cost depends on your vehicle, location, and labor rates.
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