U3548
High Voltage System Interlock Circuit P High
U3548 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit P High. Common causes: open or short circuit in the interlock circuit, high voltage lockout sensor malfunction. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- Reduced vehicle power
- The car goes into emergency mode
- Inability to start the high voltage system
- Warning messages appear on the instrument panel
Causes
- Open or short circuit in the interlock circuit
- High Voltage Lockout Sensor Malfunction
- Problems with high voltage relay
- Wiring harness damage
- Malfunction of the high-voltage system control module
How to Fix
- Carry out diagnostics of the high-voltage system
- Check the integrity of the locking circuit
- Test blocking sensors
- Check the condition of high-voltage relays
- Repair only from an authorized dealer
Related codes
Error U3548 by Vehicle Brand
FAQ
What does the U3548 code mean?
U3548 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit P High
What causes a U3548 error code?
The most common causes of U3548 include: Open or short circuit in the interlock circuit; High Voltage Lockout Sensor Malfunction; Problems with high voltage relay; Wiring harness damage.
How do I fix a U3548 diagnostic trouble code?
To fix U3548: Carry out diagnostics of the high-voltage system. Check the integrity of the locking circuit. Test blocking sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3548?
Do not drive — repair immediately
How much does it cost to fix U3548?
The estimated repair cost for U3548 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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