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AutoCodes - Mercury - U300C Mercury

U300C Mercury Code - Ignition Input Off/On/Start

- Code Popularity: 1,377 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By - Updated Jun 18, 2020
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|Code 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 the 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.

Does your Mercury have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code U300C Mercury?

Labor: 1.0

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.

|What are Code U300C Mercury Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|Code U300C Mercury Description

The Powertrain Control Module (PCM) monitors the ignition key state. The U300C code sets when the key state is not available.

OBDII Code U300C Mercury - Ignition Input Off/On/Start -
U300C Mercury Code - Ignition Input Off/On/Start

|Need More Information on the U300C Mercury Code?

Need more information on how to fix the U300C Mercury code? Get Access to Factory Service Manuals

|Need Help with the U300C Mercury Code?

Get the U300C Mercury code diagnosed by a professional: Find a repair shop in your area

|Code U300C Mercury comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U300C Mercury code? Have you replaced any parts?
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