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Unread 06-24-2011   #1 (permalink)
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Default O/D Off Blinking

So I drove my stang about 60 miles today and after about 45 the light started blinking, the transmission didnt make any strange noise and the O/D worked fine, I pulled over and shut the car off and turned it back on the light stayed off for about 10 miles and came back on again blinking just as it was before. Recently I changed the fluid and put a bottle of Lucas in. Fluid levels look good, could it be that the tranny is overheating? or has a bad sensor? Like I said it seems like its going through all its gears properly.
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Unread 06-24-2011   #2 (permalink)
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Hi I quoting from the big book "The O/D OFF indicator is controlled by the off/on message sent from the PCM over the SCP network". Whatever the heck that means. Maybe someone else can tell us what those abbreviations mean.

If the tranny is working, don't worry about it too much until we figure this out.
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Unread 06-24-2011   #3 (permalink)
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interesting, I read somewhere else that the O/D Light blinking was the equivalent of a check engine light for the tranny. Fluid level is good, nothing leaking. And the light doesnt start blinking until after I'v driven it 30 miles or so. I just drove it too and from work without it coming on. which is about 6 miles each way.
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Unread 06-25-2011   #4 (permalink)
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So I hooked up the car to a scanner and the shop couldnt figure what was going on, The light hasn't blinked since yesterday. Should I just forget about it?
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Unread 06-26-2011   #5 (permalink)
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Yeah, forget about it for now. Maybe connecting the scanner and reading it allowed the computer to clear itself.
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Unread 06-26-2011   #6 (permalink)
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Last time mine started blinking I just did the service, filter and fluid, and it stopped, I would imagine if a sensor was going bad it would blink all the time
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Unread 06-26-2011   #7 (permalink)
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cool thanks guys.
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Unread 06-27-2011   #8 (permalink)
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So same thing happened again today, drove about 30 miles and the OD light started blinking. The only mechanical thing I could notice happening was every once in a while the RPM's would rev up from 1800 too 2000 and then drop back down without shifting or anything while in cruise control going 60 mph on a flat straight road. I'm taking it to a garage in the morning for an inspection and a computer reset. Hopefully that fixes it.
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Unread 06-27-2011   #9 (permalink)
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Well you could reset it yourself, just undo battery (net then pos) wait 30 mins and hook it back up, that resets it then you can drive to see if it would come back on or not, but taking it for inspection would be a good idea
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Unread 06-27-2011   #10 (permalink)
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Trans Shop says the code is PO 741, and it could be a bad wire.
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Unread 06-27-2011   #11 (permalink)
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Quote:
Originally Posted by Shaydipanda View Post
<acronym title="transmission">Trans</acronym> Shop says the code is PO 741, and it could be a bad wire.
That code has to do with the torque convertor clutch circuit, with that being the tq convertor it could explain why you have the slight raise and lowering of rpm's while driving
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Unread 06-27-2011   #12 (permalink)
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that mean time for a new torque converter?
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Unread 06-27-2011   #13 (permalink)
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I need to drive like 500 miles in a week, what happens if I let it go? You think it will make it?
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Unread 06-27-2011   #14 (permalink)
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Quote:
Originally Posted by Shaydipanda View Post
I need to drive like 500 miles in a week, what happens if I let it go? You think it will make it?
Like they said it could be a bad wire, remember an auto is electronically controlled, I would find out which it is before you spend momey
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