U300C
Ignition Input Off/On/Start
U300C is an OBD-II diagnostic trouble code meaning: Ignition Input Off/On/Start. Common causes: open or short circuit in the ignition circuit, poor contact in connectors. Estimated repair cost: $6–56.
Symptoms
- Engine won't start
- Problems starting the engine
- No power on some systems
- Check Engine Light Is On
- Incorrect operation of electronic systems
Causes
- Open or short circuit in the ignition circuit
- Poor contact in connectors
- Control module malfunction
- Problems with the ignition switch
- Contact corrosion
How to Fix
- Check the integrity of the ignition circuit
- Inspect and clean connector contacts
- Check voltage on ignition circuit
- Test the ignition switch
- If necessary, replace the control module
Related codes
Error U300C by Vehicle Brand
FAQ
What does the U300C code mean?
U300C is an OBD-II diagnostic trouble code that indicates: Ignition Input Off/On/Start
What causes a U300C error code?
The most common causes of U300C include: Open or short circuit in the ignition circuit; Poor contact in connectors; Control module malfunction; Problems with the ignition switch.
How do I fix a U300C diagnostic trouble code?
To fix U300C: Check the integrity of the ignition circuit. Inspect and clean connector contacts. Check voltage on ignition circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U300C?
Do not drive — repair immediately
How much does it cost to fix U300C?
The estimated repair cost for U300C is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat