U3539
High Voltage System Interlock Circuit M
U3539 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit M. Common causes: open or short circuit in the interlock circuit, high voltage lockout sensor malfunction. Estimated repair cost: $56–167.
Symptoms
- Check Engine light comes on
- Reduced power or limited engine operation
- Inability to start the high voltage system
- Error message on the dashboard
- Disabling the High Voltage Battery
Causes
- Open or short circuit in the interlock circuit
- High Voltage Lockout Sensor Malfunction
- Wiring harness damage
- Problems with the high voltage system control module
- Corrosion of contacts in connectors
How to Fix
- Check the integrity of the high voltage blocking circuit
- Inspect and, if necessary, replace the locking sensors
- Check the condition of the wiring harness and connectors
- Scan the control module for additional errors
- Repair only from an authorized dealer
Related codes
Error U3539 by Vehicle Brand
FAQ
What does the U3539 code mean?
U3539 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit M
What causes a U3539 error code?
The most common causes of U3539 include: Open or short circuit in the interlock circuit; High Voltage Lockout Sensor Malfunction; Wiring harness damage; Problems with the high voltage system control module.
How do I fix a U3539 diagnostic trouble code?
To fix U3539: Check the integrity of the high voltage blocking circuit. Inspect and, if necessary, replace the locking sensors. Check the condition of the wiring harness and connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3539?
Yes, but get it checked soon
How much does it cost to fix U3539?
The estimated repair cost for U3539 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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