Scottwax

Rain on and off today so I went to my friend's shop to have a minor front end clunk checked and figured while it was on the lift I'd have him change out the 3rd and 4th gear pressure switches. He calls Honda and they say the part numbers have changed for the switches and sent over the following:

28600-RKE-004
28610-RKE-004
90471-PW7-A00 (2) the washers

Pretty easy swap out it appeared but on the test drive, once it shifted into 3rd gear, it was shuddering and started tossing out codes along with a blinking D light.

He brings it back checks the codes (torque converter and shift solenoid A), resets the TCM and then decides maybe he got them reversed. Swaps positions, same exact results. Takes out the new switches, puts the old ones in, again the same results on a test drive. We both looked to see if maybe there was a connection that was missed but didn't see any.

I looked at the big thread about changing the switches and it appears we got the right parts from Honda. Someone else mentioned having a similar issue after doing their switches but never followed up on how it was resolved.

Any ideas? I've been using this mechanic on and off for about 20 years now, this is the first time a repair has gone wrong.

FWIW, I had my 5AT rebuilt last summer, put about 27k miles on it since. Other than a very occasional and temperature dependent 5 to 4 down shift minor flair (which I was hoping the 4th gear pressure switch would solve) I haven't had any issues.

Oh Sickest TL

iTrader: (3)

thats fucking brutal buddy....something is happening there for sure.....dont fix what is not broken is what Ive always been told... although from reading on the a zine here, replacing the switches is "preventative" maintenance...weird

TheChamp531

iTrader: (3)

Sounds like you didn't put the right sensor in there respective spot or didn't tighten it enough. No way the pressure switches would cause any problems unless it wasn't properly installed or you got a defective part.

Scottwax

Going back to the old ones still have the same issue. I'm leaning towards something being missed with a connector but it was already after 6 pm (when he normally closes) and we were being hit by strong storms. He says he'll call the shop that did the rebuild first thing Monday to see what he can find out from them.

toantran99

Good luck, please let us know

Scottwax

Turns out when swapping out the pressure switches, the transmission ground was disturbed. Apparently it doesn't take much to freak out all the electronics on the transmission. He got pretty much every code for every electronic part of the transmission. Removed the ground wire, cleaned it and the area it attaches too, reset all the codes.

New pressure switches are in now, part throttle shifts are definitely improved. Fast and super smooth. No real full throttle yet, had to drive home in crappy DFW rush hour traffic and now its pouring rain. Again.