OBDII Code List

U300C MERCURY - Ignition Input Off/On/Start

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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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
  • 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.
    OBDII Code U300c Mercury - Ignition Input Off/On/Start -

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