Ignition Input Off/On/Start
Table of contents
U300C MERCURY Possible Causes
- Ignition Input Off/On/Start (ISP-R) harness is open or shorted
- Ignition Input Off/On/Start (ISP-R) circuit poor electrical connection
How do I fix code U300C MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the U300C MERCURY code
The cost of diagnosing the U300C MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
U300C MERCURY Description
The Powertrain Control Module (PCM) monitors the ignition key state. The U300C code sets when the key state is not available.
