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Trans code P0720

Old Apr 13, 2016 | 07:24 PM
  #1  
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Trans code P0720

So just got a new pcm installed since i fried the last one anyway

i had a new trans installed almost two weeks ago factory 4r100 now i have a p0720 code. Id take it back to that dealer but id rather put fireball in my *** so im just going to fix it myself

I cant seem to find a part price though for the sensor or some trouble shooting things to do before buying another part since ive had my truck two days in the past month,

EDIT if i woulda searched more i found a price at advanced auto.. but id like to trouble shoot before i replace
 
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Old Apr 13, 2016 | 07:46 PM
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The first thing to do is check the the wiring is actually plugged into the sensor. If the code comes shortly after a new trans is installed that's usually the problem.
 
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Old Apr 13, 2016 | 07:49 PM
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Ill check that tomorrow after work, The Over drive light only flashes once it shifts for the first time after being started .

process is Start , revs to 2krpms then shifts from 1st to 2nd, OD light flashes then it shifts smooth and fine after that .

I drove it 3 hours from PA to DE the weekend i picked it up with no issues just dont get how the dealership who did the install wouldnt of noticed it
 
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Old Apr 13, 2016 | 08:21 PM
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Originally Posted by tjbradney
Ill check that tomorrow after work, The Over drive light only flashes once it shifts for the first time after being started .

process is Start , revs to 2krpms then shifts from 1st to 2nd, OD light flashes then it shifts smooth and fine after that .

I drove it 3 hours from PA to DE the weekend i picked it up with no issues just dont get how the dealership who did the install wouldnt of noticed it
You have been around many dealers have you.........
Lol
 
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Old Apr 13, 2016 | 09:10 PM
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Haha well my trans went on my home down to de since my wife and son are in pa. I work in de so closest dealer got it but they dicked and dicked around but either way
 
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Old Apr 14, 2016 | 07:51 PM
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Whelp crawled under this afternoon OSS plug wasnt right the Green wire was not in the plug so pulled it back some and re connected all problems solved will most likely get a new connector this weekend since i just shoved the wire in there
 
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Old Apr 14, 2016 | 08:12 PM
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Originally Posted by Mark Kovalsky
The first thing to do is check the the wiring is actually plugged into the sensor. If the code comes shortly after a new trans is installed that's usually the problem.
The collective knowledge on this site and the willingness to help makes it so awesome

And well worth any money I've spent to be a member!!!!
 
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Old Apr 14, 2016 | 09:40 PM
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Heck yeah! Now just to install my regulated fuel system
 
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Old Apr 14, 2016 | 10:39 PM
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Originally Posted by tjbradney
i had a new trans installed almost two weeks ago replace

I'd be on their six until they bought a new one and installed it!!!


I'm sure they "Jerry" rigged it anyway.
 
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