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.
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.
The Powertrain Control Module (PCM) monitors the ignition key state. The U300C code sets when the key state is not available.
Need more information on how to fix the U300C Mercury code? Get Access to Factory Service Manuals
Get the U300C Mercury code diagnosed by a professional: Find a repair shop in your area
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