U3511
High Voltage System Interlock Circuit B
U3511 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit B. Common causes: open or short circuit in the interlock circuit, damaged high voltage system connectors. Estimated repair cost: $56–167.
Symptoms
- High Voltage System Failure Warning on Dashboard
- Engine power limitation
- The car goes into emergency mode
- Inability to start the engine (in some cases)
- Disabling the High Voltage Battery
Causes
- Open or short circuit in the interlock circuit
- Damaged high voltage system connectors
- High Voltage Lockout Sensor Malfunction
- Damage to the insulation of high-voltage cables
- Problems with the high voltage system control unit
How to Fix
- Check the integrity of the high voltage blocking circuit
- Inspect the connectors and contacts of the high-voltage system
- Check the condition of the blocking sensors
- Carry out diagnostics of the high-voltage system control unit
- Repair only from an authorized dealer
Related codes
Error U3511 by Vehicle Brand
FAQ
What does the U3511 code mean?
U3511 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit B
What causes a U3511 error code?
The most common causes of U3511 include: Open or short circuit in the interlock circuit; Damaged high voltage system connectors; High Voltage Lockout Sensor Malfunction; Damage to the insulation of high-voltage cables.
How do I fix a U3511 diagnostic trouble code?
To fix U3511: Check the integrity of the high voltage blocking circuit. Inspect the connectors and contacts of the high-voltage system. Check the condition of the blocking sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3511?
Do not drive — repair immediately
How much does it cost to fix U3511?
The estimated repair cost for U3511 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat