1780 trans control switch o/d cancel circuit out of self test range

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02 Jul, 2012

  • 72%
    Solved this issue
  • 96min
    Time to fix
  • 62%
    Recommend to DIY
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P1780 is a FoMoCo proprietary code and the verbiage is in fact "transmission control switch out of self-test range". This DTC can only occur during a KOER self-diagnostic. 99.9% of the time, if you see this DTC, it's because when the KOER self-diagnostic was run, the TCS was not cycled as required. Simple.

The troubleshooting procedure for this is quite easy, however if you have no transmission related driveability issues, you can be assured that it was just that the TCS button got missed. My guess is that the steering wheel didn't get turned 1/4 turn and the brake pedal probably wasn't pushed either. Oops.
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