U3543

High Voltage System Interlock Circuit O Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Possible problems starting the electric vehicle
The system may limit engine power
A warning message appears on the dashboard

Causes

Open circuit in high voltage blocking circuit
Damaged or oxidized connector contacts
Lock sensor malfunction
Problems with the high voltage system wiring harness
Malfunction of the high-voltage system control unit

How to Fix

Check the integrity of the high voltage blocking circuit
Inspect and clean the connector contacts
Check the condition of the high voltage system wiring harness
Test high voltage block sensor
If necessary, replace damaged components
Repair only from an authorized dealer

Related codes

U3541 U3542 U3544