blinking overdrive light and 1728 code - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 08-03-2012, 02:41 AM Thread Starter
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blinking overdrive light and 1728 code

so my 97 E350 7.3psd 4x4 van has had the blinkin OD light go off for me and then hard shifting (until i restarted). i took it to a buddy who happens to run a shop (and does trannies) which is where i scanned it for the 1728 code. they hooked it up to the diagnostic equipment and drove it alot, stating it drove nice and all perimeters seemed normal (vehicle speed included) with the exception of the computer was never commanding the torque convertor to lock up.

but they never got it to throw a code again and recommended i just drive it, 27 miles later i got a flashing OD light again. they are kind of stumped and think i have 2 things going on, a computer problem not asking for lock up, and something within the tranny maybe, but hate to just throw $ at unknowns

thoughts? its the stock tranny (e40d right?) with a transfer case adapted from a 06 f250. auto trannies are not my area of expertise
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post #2 of 11 (permalink) Old 08-03-2012, 11:51 AM
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Re: blinking overdrive light and 1728 code

Yes, it's an E4OD. I doubt that it is a computer problem. It is rare for them to fail, but it is also possible.

They need to use the scanner to look at all the inputs. Vehicle speed, brake light switch, engine speed, and several others.

One quick thing to check is the brake lights. Do all of them work, including the third brake light on top of the cab? If any of them don't work the converter won't lock.

Mark
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“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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post #3 of 11 (permalink) Old 08-03-2012, 03:23 PM Thread Starter
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Re: blinking overdrive light and 1728 code

thanks for the reply, i do know they used there scanner to read all such things and did mention to me the brake light switch was working, VSS was giving accurate enough reading to the speedo, manifold pressure etc etc.

as for whether or not all my brake lights are working, i will check, thats a weird one, and have heard the same for dome light and fuse (which i did check)
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post #4 of 11 (permalink) Old 08-05-2012, 02:09 AM Thread Starter
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Re: blinking overdrive light and 1728 code

so i just checked my brake lights, yeah, my center/third light is not working, i will fix that tomorrow.

so, would something as weird as a burnt out brake light be throwing the 1728 code, or will it just keep the computer from commanding lockup and i still have another problem throwing the "1728 trans slip error"
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post #5 of 11 (permalink) Old 08-05-2012, 11:31 AM
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Re: blinking overdrive light and 1728 code

Let's fix one problem at a time and see what happens. These things can be all interrelated.

Mark
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post #6 of 11 (permalink) Old 08-05-2012, 07:58 PM Thread Starter
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Re: blinking overdrive light and 1728 code

got the lights swapped out on the 3rd brake light and went for a drive, about 20 miles in the OD light started to blink again. the code reader gave me the same code (1728) but does not allow me to clear the code (NAPA reader give me an error) but i wouldnt think a code stored in memory would be giving me trouble, but i will go clear it tomorrow with my buddies real reader

so, what should i look for next
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post #7 of 11 (permalink) Old 08-05-2012, 08:53 PM
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Re: blinking overdrive light and 1728 code

Does the torque converter lock?

Mark
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post #8 of 11 (permalink) Old 08-05-2012, 11:20 PM Thread Starter
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Re: blinking overdrive light and 1728 code

it feels just fine, so i will have to hook it up to my buddies scanner to verify for sure. it felt fine before as well, but there scanner saw it was never commanding lockup
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post #9 of 11 (permalink) Old 08-06-2012, 05:25 PM Thread Starter
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Re: blinking overdrive light and 1728 code

cleared the codes this AM and light strated blinking again. I do not have access to a scanner right now to see if lock up is being commanded or any of that good stuff, but van seems to drive fine by the seat of my pants reading.

what to try next? and could this be caused by a bad tank of gas? ironically started having problems right after a fillup so worth wondering about.
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post #10 of 11 (permalink) Old 08-06-2012, 05:59 PM
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Re: blinking overdrive light and 1728 code

The next step is to read the codes and look at live data to see what the PCM is seeing from the sensors and what it is telling the transmission to do.

Anything else is a waste of time.

Mark
Former Ford Automatic Transmission Engineer

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