U3537

High Voltage System Interlock Circuit L Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$28–167 (est.)

Symptoms

The car won't start
Malfunction indicator light (MIL) is on
High voltage system fault warning
No power to high voltage battery
Vehicle power limitation

Causes

Open or short circuit in the interlock circuit
Faulty interlock circuit interconnect sensor
Damage to the high voltage system wiring harness
Problems in the high voltage system control module
Contact corrosion in interlock circuit connectors

How to Fix

Check the integrity of the high-voltage system interlock circuit
Inspect connectors and wiring for damage
Test Interlock Circuit Interconnect Sensor
Check the high voltage system control module
Repair only from an authorized dealer

Related codes

U3537 U3538 U3540