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A recent issue that developed with my 2012 JK was a hard shift on kick down and the transmission straining to get into overdrive.



Checking the fault codes turned up nothing and I did not have a check engine light pointing at the problem.



When I checked the forums it seemed that plenty of people experienced the same issue and had not resolved it properly. Some accounts said dealers were telling them that was just the way it was supposed to be, live with it. I wasn't satisfied with any of the answers I found on the forums so I research the transmission.

I read a couple good articles and a 211 page student diagnostic manual (PDF) on the W5A580 (NAG1) transmission. After all the reading I deduced that I was getting a bad signal from a rear wheel speed sensor that controlled the solenoids that in turn controlled the shifting.



After physically checking I found a wheel speed sensor on my rear passenger side that was dirty. While it didn't throw a code it seems the dirt was enough to confuse the shift of the transmission in certain conditions. I cleaned up the dirty sensor and gear with WD40 and brake fluid. The vehicle resumed normal operation with smooth shifts on kick down and no straining to get into overdrive.

Thought I would share this because so many people were paying transmission shops to fix the issue or being told they just had to live with it. Here is the possible fix for your problem and it didn't cost me more than $10 to fix.


See you on the trails!
 

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Awesome post and timing, thanks. I just started noticing something like this.

Sent from my SM-G973U using Tapatalk
 

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I read a couple good articles and a 211 page student diagnostic manual (PDF) on the W5A580 (NAG1) transmission. After all the reading I deduced that I was getting a bad signal from a rear wheel speed sensor that controlled the solenoids that in turn controlled the shifting.

Nice job "working the problem". Tenacity and curiosity are two qualities that achieve results. :winner:

Extra thanks for documenting the process and reporting it back into the community.

<D>
 
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