U353A

High Voltage System Interlock Circuit M Performance

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

The Check Engine light comes on
The car may go into emergency mode
Engine power limitation
Inability to start hybrid/electric system

Causes

Open circuit in HVIL circuit
Short circuit in HVIL circuit
Damage to high voltage system connectors
High voltage system controller malfunction
Damage to the insulation of high-voltage wires

How to Fix

Visual inspection of high voltage connections
HVIL Circuit Continuity Test
Diagnostics of high-voltage system connectors
Checking the insulation resistance of high voltage components
Repair only from an authorized dealer

Related codes

U3539 U353B U353C