2000 f 350 lariat tranny - Ford Powerstroke Diesel Forum
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Old 06-13-2010, 05:22 PM
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2000 f 350 lariat tranny

Long time reader first time poster. Have gotten lots of help here just by reading.

My problem My tranny od light is flashing. Tranny was rebuilt. It was blinking before we sent it to be rebuilt, and still is flashing now. The truck drives and shifts fine,(however sometimes when trucks cold in morning it runs up to redline before shifting if you dont back off) I reset the computer by disconnecting batteries, and turning on headlights. When this was done the OD light stopped flashing and turned on and off normal.However when truck gets to about 20 mph it starts flashing again. And stays in the flashing mode.

I have changed the rear sensor on rear axle after tranny was rebuilt.
Also another strange occurrence is once in a while my brakes act up.
The abs seems to activate for no reason under normal braking and the pedal gets stiff or pushes back.

Trucks has about 216000 miles 4x4 7.3 diesel automatic.
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Old 06-14-2010, 03:52 AM
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You need to scan for codes. The OD light flashes to let you know that you have a tranny code. It sounds like you have a speed sensor going bad somewhere.
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Old 06-15-2010, 08:08 PM
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heres the codes

po470
po603
po720


we found a plug on tranny that was unplugged or became unplugged. and set that straight. and all the symptoms i described before for the tranny are gone.

what do I do about the pcm/ ecm code? where is that located?

Thanks Kyller
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Old 06-15-2010, 08:20 PM
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P0470 is an Exhaust Backpressure Low Perf/Volt. Usually bad connection or dead sensor.
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Old 06-15-2010, 08:39 PM
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Thank You.

ok, where is it ? I am looking up the pcm/ ecm code? whats that all about?
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Old 06-15-2010, 08:45 PM
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I believe it is near the firewall above the passenger side valve cover. The ECM code? meaning the P0603 code? It is set when ever the power is lost to the ecm or you reprogram the ecm.
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Old 06-15-2010, 08:49 PM
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well that may make sense because i reset the computer by pulling the power and ground. trying to reset the computer for the tranny issue. But the scanner keeps pulling the po603 pcm ecm code?

What do I do now?

Thanks for the the help and replies.
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Old 06-15-2010, 08:53 PM
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Just clear the code, but it will come back every time power is lost.
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Old 06-15-2010, 09:06 PM
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ok thank you.
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