U3537
High Voltage System Interlock Circuit L Low
U3537 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit L Low. Common causes: open or short circuit in the interlock circuit, faulty interlock circuit interconnect sensor. Estimated repair cost: $28–167.
Symptoms
- The car won't start
- Malfunction indicator light (MIL) is on
- High voltage system fault warning
- No power to high voltage battery
- Vehicle power limitation
Causes
- Open or short circuit in the interlock circuit
- Faulty interlock circuit interconnect sensor
- Damage to the high voltage system wiring harness
- Problems in the high voltage system control module
- Contact corrosion in interlock circuit connectors
How to Fix
- Check the integrity of the high-voltage system interlock circuit
- Inspect connectors and wiring for damage
- Test Interlock Circuit Interconnect Sensor
- Check the high voltage system control module
- Repair only from an authorized dealer
Related codes
Error U3537 by Vehicle Brand
FAQ
What does the U3537 code mean?
U3537 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit L Low
What causes a U3537 error code?
The most common causes of U3537 include: Open or short circuit in the interlock circuit; Faulty interlock circuit interconnect sensor; Damage to the high voltage system wiring harness; Problems in the high voltage system control module.
How do I fix a U3537 diagnostic trouble code?
To fix U3537: Check the integrity of the high-voltage system interlock circuit. Inspect connectors and wiring for damage. Test Interlock Circuit Interconnect Sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3537?
Do not drive — repair immediately
How much does it cost to fix U3537?
The estimated repair cost for U3537 is $28–167. Actual cost depends on your vehicle, location, and labor rates.
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