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Have you had it scanned for codes yet? Does the engine and transmission operate normally when the light comes on?
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Are you using a generic code reader?
Is it a small hand held code reader like autozone sells?
Ford has many proprietary transmission, throttle body and PCM codes that can only be read by high end scanners such as Ford IDS, Snap on SOLUS etc... the auto parts store code readers will not pull these codes.
Yes actron will only read generic OBD2 universal codes. Looks like you are going to have to have it scanned with a higher end scanner. Sorry please don't shoot the messenger.
I would suspect it is going to have one or more of these manufacturer specific codes. They really go all out sometimes with these codes, making you take it to the dealer! There are several high end scanners that aftermarket shops use, cheapest one is over 2K.
Gas or Diesel?
Intermittent output shaft speed sensor failures, Intermittent transmission range sensor failures, Internal PCM torque calculation errors, Internal PCM engine timer faults, Intermittent high speed can buss errors. Next to impossible without codes, these are the most common that I see at the dealer. There are also many diesel specific codes that the actron won't retrieve either, catalyst, dpfe, regen codes and the like are all manufacturer specific.
Best of luck!