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lostrider, Ford Technician
Category: Ford
Satisfied Customers: 3075
Experience:  ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.
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1995 Ford F250: automatic..overdrive..trans..The od light blinks

Resolved Question:

I have a 1995 Ford F250 with a 460 and and automatic overdrive trans. The od light blinks and when you push the button nothing happens. There overdrive doesn't to come on or go off. At times the transmission seems to come out of gear. This problem is not consistent though.
Submitted: 7 years ago.
Category: Ford
Expert:  lostrider replied 7 years ago.

HiCustomerthis is lostrider, the blinking OD light is a warning indicator informing the driver there is a concern within the transmission that the Processor is seeing and is turning on the indicator, pushing the button will have no effect on the light or transmission when there is a concern happening, there will be a code set in the memory of the Processor that can be pulled and that code will point in the direction of the failure but to find the problem the pinpoint testing will have to be done, the concern can be Electrical, Mechanical and or Hydraulic, here is an outtake from the service manual, hope this helps.

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
Description: The Transmission Control Switch is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module. The powertrain control module then energizes the transmission control indicator lamp and the coast clutch solenoid, applying the coast clutch to provide engine braking and cancels fourth gear operation. The TCIL indicates overdrive cancel mode activated (lamp on), electronic pressure control circuit shorted or monitored sensor failure (lamp flashing).
Sensor: Transmission Control Switch.
Symptoms: No overdrive cancel when switch is cycled.
Diagnostic Trouble Codes: 632, P1780, tested during Key On Engine Off (KOEO) On-Board Diagnostic only.
Actuator: Transmission Control Indicator Lamp.
Symptoms: Failed on - overdrive cancel mode always indicated, no flashing for electronic pressure control circuit shorted. Failed off - overdrive cancel mode never indicated, no flashing for electronic pressure control circuit shorted.
Diagnostic Trouble Codes: 631, P1779.

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