U300F
Ignition Input Accessory
U300F is an OBD-II diagnostic trouble code meaning: Ignition Input Accessory. Common causes: ignition switch malfunction, damage to the ignition relay. Estimated repair cost: $17–89.
Symptoms
- Car won't start in ACC position
- Problems with the operation of accessories when the ignition is on
- Dashboard flashing or turning off
- Unstable operation of electrical equipment
Causes
- Ignition switch malfunction
- Damage to the ignition relay
- Open or short circuit in the circuit
- Problems with the engine control unit
- Contact corrosion
How to Fix
- Check the condition of the ignition switch
- Diagnose the ignition relay
- Check the integrity of wiring and connections
- Scan the control unit for other errors
- Replace faulty components
Related codes
Error U300F by Vehicle Brand
FAQ
What does the U300F code mean?
U300F is an OBD-II diagnostic trouble code that indicates: Ignition Input Accessory
What causes a U300F error code?
The most common causes of U300F include: Ignition switch malfunction; Damage to the ignition relay; Open or short circuit in the circuit; Problems with the engine control unit.
How do I fix a U300F diagnostic trouble code?
To fix U300F: Check the condition of the ignition switch. Diagnose the ignition relay. Check the integrity of wiring and connections. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U300F?
Do not drive — repair immediately
How much does it cost to fix U300F?
The estimated repair cost for U300F is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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