was having some transmission slipping at 140,000. my local mechanic suggested a new Trans Speed Sensor. He installed new NTK Trans Speed Sensor. then got really bad slipping from 1st to 2nd with the car bucking.
I took it back and they recommended a Trans Control Module. So I got a refurbished Trans Control Module. the car is MUCH better, changing gears, but this morning within a minute of driving there was a slight hesitation going into 2nd and it threw a Check Engine Light. I pulled the code P0175 Input Shaft Speed Sensor and Circuit. I am in Florida and the weather has been colder in the morning. I have not changed the Trans Fluid in quite a while and its looks clean.

any help is appreciated

 

Welcome, and nice looking car. Envy your weather!

Yes, consider your local mechanic payment as a late Christmas gift and just move on.
Go to Honda dealer to service tranny. Tranny is too critical and expensive to rely on a generally good all around mechanic.

Additional: After two bad experiences with tranny services at independent shops years ago I now choose to go to dealer for any A/T tranny issues that require shop work or maintenance. And dealers only use Honda brand fluids; here independent shops only use aftermarket brand fluids (because dealers don't have part delivery services, whereas Oreilly's, Autozone will deliver to independent shops).

 

thanks for your response. so the mechanics I have been using are excellent, but understand what you are saying.

so are you specifically saying If I do a Transmission Flush, dont go anywhere other then a Honda Dealership? I understand about using Honda Brand fluids.

some say do not flush the trans as you might create more issues, while others recommend doing it. I did it years ago but not at a dealership,.

any thoughts on doing a Transmission flush at 140,000?

thank you!

 

so just to mention, I put in a new NTK Trans Speed Sensor and a refurbished Trans Control Unit. I had a VSS issue years back and a local shop put in a new Vehicle Speed Sensor. they overcharged me but I know better now.

I do not know what kind of VSS they installed, but I have a brand new NTK VSS at home. should I have it installed as I already replaced the TCU and Trans Speed Sensor. Sensors go bad over time? so it cant hurt, only help to switch up the VSS to a new part as well?

thanks!

 

so after doing more research I think the car could use a Drain and Fill as its been over 30,000 since I last did it and it was at Tire Kingdom (now I know better lol) and really best to stay away from a Flush which could create many problems.
I will go to a Honda dealer to to the Drain & Fill so its Honda Trans Fluid only and not aftermarket.

 

and If I do a Drain & Fill, should I do it 3 times to get a full replace of the Transmission Fluid. Is there a point to doing it just once and only replacing 1/3 of the fluid to new?

 

There's a bit of confusion out there, so it's good to be careful.

Honda auto transmissions don't like to be power-flushed for a couple reasons. One biggie is that an independent shop is probably not willing to drain, clean, and switch their flushing-machine over to Honda fluid. So you'll get generic fluid. I also suspect that the trans. doesn't like the fluid pumped through under pressure. It likes to circulate the fluid with it's own pumps.

There are some Honda dealers that will say "flush" in conversation, but they actually perform a drain & fill. If anyone says they flush the trans., make sure you clarify.

If it's been a long time or the fluid comes out dirty, the 3x drain/fill is good because you can only drain about 1/3 of the total fluid. Personally, after doing that, I would choose a shorter interval to do a single drain/fill so it never gets very dirty to begin with.

 

thanks so much! great information! have a great day! stay safe!

 

Doing 1 drain refill will help. Definitely inspect the fluid on the first drain to see if it has any metal shavings, burnt smell, or debris.

I remember a thread from years ago where the original poster did a drain refill and noticed a slight improvement. After driving for a day to get the fluid mixed, the second drain/refill showed a much larger improvement. The original poster completed the 3rd drain and refill to finish the recommended service. Assuming good mixing after a fluid change, you get 33% new fluid after 1 drain/refill, 55% new fluid after the second, and 70% new fluid after the third. After the 3rd change, you are draining mostly new fluid, so the increase in new% of fluid doesn't increase as much.

If the internal clutches are worn past the point of no return, the fluid changes won't fix the problem. It is much cheaper and faster to try a fluid change vs replacing a transmission.

 

thanks very much! im going to do a 3 x Fluid change soon! how soon after the first Drain & Fill should you do the second? the Transmission at 140,000 seems to be working much better now that I put a new Trans Speed Sensor and TCU. drives like its new, aside from everything else I did to the car which is a long list.