U3004
Accessory Power Relay
U3004 is an OBD-II diagnostic trouble code meaning: Accessory Power Relay. Common causes: faulty power relay, open or short circuit in the relay circuit. Estimated repair cost: $3–17.
Symptoms
- Some electronic options of the car do not work
- Periodic shutdown of additional equipment
- Check Engine Light Is On
- Problems starting some systems
Causes
- Faulty power relay
- Open or short circuit in the relay circuit
- Problems with the control unit
- Contact corrosion
- Wiring harness damage
How to Fix
- Check the condition of the power relay
- Check the integrity of the relay circuit
- Inspect contacts for corrosion
- Check the voltage at the relay terminals
- If necessary, replace the relay
Related codes
Error U3004 by Vehicle Brand
FAQ
What does the U3004 code mean?
U3004 is an OBD-II diagnostic trouble code that indicates: Accessory Power Relay
What causes a U3004 error code?
The most common causes of U3004 include: Faulty power relay; Open or short circuit in the relay circuit; Problems with the control unit; Contact corrosion.
How do I fix a U3004 diagnostic trouble code?
To fix U3004: Check the condition of the power relay. Check the integrity of the relay circuit. Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3004?
Yes, but get it checked soon
How much does it cost to fix U3004?
The estimated repair cost for U3004 is $3–17. Actual cost depends on your vehicle, location, and labor rates.
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