U353D

High Voltage System Interlock Circuit N

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

The Check Engine light comes on
Reduced power or inability to start the electric motor
Error message on the car display
High voltage system blocking
The car may go into emergency mode

Causes

Wire break in the HVIL circuit
Poor contact in high voltage system connectors
Wiring harness damage
One of the HVIL limit switches is faulty
Problems with the high voltage system control unit

How to Fix

Diagnose the HVIL circuit using a scanner
Check the integrity of wiring and connectors
Inspect the interlock circuit limit switches
Replace damaged circuit components
Repair only from an authorized dealer

Related codes

U353C U353E U3540