Code : U300C
Marque : LINCOLN
Description : U300C LINCOLN Ignition Input Off/On/Start
Causes possibles :
* Ignition Input Off/On/Start (ISP-R) harness is open or shorted
* Ignition Input Off/On/Start (ISP-R) circuit poor electrical connection

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Please note

In most cases, the check engine light comes on even without a fault or because of a minor fault.
The electronics can be fickle and can detect "failures" without incidence :

  • Poor fuel quality,
  • Fuel tank cap improperly closed,
  • Low oil level,
  • A faulty sensor,
  • Etc...

Sometimes, a simple reset via CarDiag can solve a lot of "electronic problems".