U3529
High Voltage System Interlock Circuit H
U3529 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit H. Common causes: damage to the insulation of high-voltage cables, lock sensor malfunction. Estimated repair cost: $33–56.
Symptoms
- Car won't start
- Malfunction indicator light (MIL) is on
- Error message on the dashboard
- Problems with charging a high-voltage battery
- Reduced High Voltage System Performance
Causes
- Damage to the insulation of high-voltage cables
- Lock sensor malfunction
- Problems with wiring or connectors
- Malfunction of the high-voltage system control unit
- Corrosion of contacts in the interlock circuit
How to Fix
- Check the insulation of high-voltage cables for damage
- Check the lock sensors and their wiring
- Check connectors and wiring for corrosion and damage
- Check the high voltage system control unit for errors
- Have your high voltage system diagnosed and repaired by a qualified technician.
Related codes
Error U3529 by Vehicle Brand
FAQ
What does the U3529 code mean?
U3529 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit H
What causes a U3529 error code?
The most common causes of U3529 include: Damage to the insulation of high-voltage cables; Lock sensor malfunction; Problems with wiring or connectors; Malfunction of the high-voltage system control unit.
How do I fix a U3529 diagnostic trouble code?
To fix U3529: Check the insulation of high-voltage cables for damage. Check the lock sensors and their wiring. Check connectors and wiring for corrosion and damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3529?
Do not drive — repair immediately
How much does it cost to fix U3529?
The estimated repair cost for U3529 is $33–56. Actual cost depends on your vehicle, location, and labor rates.
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