U351B

High Voltage System Interlock Circuit D Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–56 (est.)

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

U351A U351C U351D