U351A

High Voltage System Interlock Circuit D Performance

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–111 (est.)

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

U3500 U351B U3520