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U3529: High Voltage System Interlock Circuit H

Severity
Medium
System
Vehicle Systems
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does U3529 Mean?

U3529 is a diagnostic trouble code indicating: High Voltage System Interlock Circuit H. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U3529

Common Causes

Frequently Asked Questions

What does U3529 mean?
U3529 indicates: High Voltage System Interlock Circuit H. The vehicle's computer has detected that the High Voltage System Interlock is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code U3529?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U3529 for extended periods may cause additional problems.
How much does it cost to fix U3529?
Repair costs for U3529 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair High Voltage System Interlock wiring and connectors
  • 🔧 Replace faulty High Voltage System Interlock
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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