U3516
High Voltage System Interlock Circuit C Performance
U3516 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit C Performance. Common causes: lock sensor malfunction, open or short circuit in interlock circuit wiring. Estimated repair cost: $56–278.
Symptoms
- Malfunction indicator light (MIL) is on
- Error message on the dashboard
- Inability to start the high voltage system
- High voltage system power limitation
- Inability to charge high voltage battery
Causes
- Lock sensor malfunction
- Open or short circuit in interlock circuit wiring
- Malfunction of the high-voltage system control unit
- Problems with interlock circuit connectors
- Damage to high voltage components
How to Fix
- Check interlock circuit wiring and connectors for damage
- Checking the Lock Sensor to Specifications
- Checking the high voltage system control unit
- Replacing faulty interlock circuit components
- Resetting error codes and retesting the system
Related codes
Error U3516 by Vehicle Brand
FAQ
What does the U3516 code mean?
U3516 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit C Performance
What causes a U3516 error code?
The most common causes of U3516 include: Lock sensor malfunction; Open or short circuit in interlock circuit wiring; Malfunction of the high-voltage system control unit; Problems with interlock circuit connectors.
How do I fix a U3516 diagnostic trouble code?
To fix U3516: Check interlock circuit wiring and connectors for damage. Checking the Lock Sensor to Specifications. Checking the high voltage system control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3516?
Do not drive — repair immediately
How much does it cost to fix U3516?
The estimated repair cost for U3516 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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