U3518

High Voltage System Interlock Circuit C High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–111 (est.)

Symptoms

Check Engine light comes on
The car may go into emergency mode
Reduced power or inability to start
Warning messages appear on the dashboard

Causes

Open circuit in high voltage blocking circuit
Damaged or oxidized contacts in connectors
High Voltage Lockout Sensor Malfunction
Wiring harness damage
Problems with the high voltage system control unit

How to Fix

Conduct a visual inspection of high-voltage connectors and harnesses
Check the integrity of the interlock circuit using a multimeter
Clean connector contacts from oxidation
Replace damaged circuit components
Repair only from an authorized dealer

Related codes

U3517 U3519 U3520