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  #1  
Old 09-04-2016, 11:23 AM
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Transmission Issues

I'm sure there is another thread for this, but there doesnt seem to be one quite like mine.
I have a 2007 WK. So NAG1.
It's having trouble shifting into first and reverse. Like someone new to a clutch lol. It shifts like butter through 3rd and stays there. No manual down or up shift. It's throwing the following codes: p0700, p0731&33, p0841, p0868, and p0944. I say either bad solenoid or low fluid... which would indicate a leak. Side note I had it towed about 6 months ago and the brilliant tow company didnt pull the drive shaft and burned the transmission up. They had it repaired and it has been absolutely fine since. Mostly posting to return and post my findings to help anyone who may have this issue themselves. But... What say you?

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Old 09-10-2016, 11:04 AM
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Re: Transmission Issues

Changes the fluid pressure sensor. No avail. Plan on dropping the pan later this afternoon and check filters. after changing the sensor and resetting the codes the light has not come back on but still shifting into 1st funny. Seems like fluid pressure problems, hoping to avoid a rebuild.
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  #3  
Old 09-10-2016, 12:14 PM
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Re: Transmission Issues

Keep us posted.
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Old 09-10-2016, 02:46 PM
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Originally Posted by MRDRFRPRFT View Post
Changes the fluid pressure sensor. No avail. Plan on dropping the pan later this afternoon and check filters. after changing the sensor and resetting the codes the light has not come back on but still shifting into 1st funny. Seems like fluid pressure problems, hoping to avoid a rebuild.
Could be the fluid pump inside the trans
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Old 09-11-2016, 10:28 AM
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Re: Transmission Issues

That's what I'm kinda hoping. Ill be dropping the pan this afternoon. From what I have read these 545rfe transmissions are pretty tough little boogers.
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Old 09-11-2016, 11:57 AM
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Originally Posted by MRDRFRPRFT View Post
That's what I'm kinda hoping. Ill be dropping the pan this afternoon. From what I have read these 545rfe transmissions are pretty tough little boogers.
Wait, your original post said nag1. What motor do you have?
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Old 09-11-2016, 10:00 PM
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Re: Transmission Issues

Yeah I realized after posting that its not the nag1. I have the 4.7. Its a limited.
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Old 09-11-2016, 10:51 PM
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Yeah I realized after posting that its not the nag1. I have the 4.7. Its a limited.
Ahh okay. Makes better sense now
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Old 10-15-2016, 12:25 PM
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Re: Transmission Issues

Ok so after going through 2 shops I finally found the problem... there wasnt one. Now I am hoping this is the case and its not temporary, but my "new" tansmission guy showed up this morning and we drove it. Yeah no problems at all. I replaced the pressure sensor and cleared all codes, even after that it didnt drive properly. But now it does. So I ask the question... Does this seem like it could be a TCM issue? He said it was very unlikely as what I was describing seemed almost certainly to be a pressure issue. Maybe sediment clogging one of the filters settled allowing it wo work properly. We may never know.
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Old 10-15-2016, 06:42 PM
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Re: Transmission Issues

I was also a bit confused regarding which transmission you have.
The P0944 code (loss of prime) and the P0868 (low line press) would indicate a too low fluid level, a detached inlet filter or even a split filter. Did you drop the pan and change both filters? The seal from the inlet filter should first be installed in the pump inlet and thereafter the filter be installed. Trying to install the filter with the seal already on it, can result in not properly seating the seal, which will result in a detached filter lateron. Also a split filter can introduce air in the fluid and reduce the line pressure.
I would also at this point not blame the TCM for what happened.
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Old 10-15-2016, 07:21 PM
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Originally Posted by Frango100 View Post
I was also a bit confused regarding which transmission you have.
The P0944 code (loss of prime) and the P0868 (low line press) would indicate a too low fluid level, a detached inlet filter or even a split filter. Did you drop the pan and change both filters? The seal from the inlet filter should first be installed in the pump inlet and thereafter the filter be installed. Trying to install the filter with the seal already on it, can result in not properly seating the seal, which will result in a detached filter lateron. Also a split filter can introduce air in the fluid and reduce the line pressure.
I would also at this point not blame the TCM for what happened.
I have to agree as well.
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Old 10-19-2016, 11:29 PM
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Re: Transmission Issues

So here we are. All at once I got the "esp bas, abs, service 4wd, and traction control" lights. Replaced all 4 wheel speed sensors. And for the hell of it I changed the crankshaft position and map sensor. Rides boat loads more smooth. However when I engage in drive the idle dips low and after about a second comes back up to about 600 rpm. Also when I am sitting still and in neutral the transmission makes a slight rattling noise... same as in park until i depress the brakes and the actually clicks into park. So I may drop the pan this weekend and see if its not only clean but the filters are seated properly. It is not throwing any codes. I am going to leave the battery disconnected overnight and see if the problem continues. It is a 545RFE btw.
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