PID for transmission temperature (2018 EX-L w/ 9 speed)

jharvey1984 · Oct 30, 2019

Hi guys/gals. Long time lurker fist time posting. We have a 2018 EX-L 9 speed with about 52k and it is showing the transmission fluid change is due. I have the service manual info, the 3.1 fluid, and am perfectly capable of performing this maintenance myself save one detail. I cant figure out how to get the tranny temp to display on my OBD II app (I use torque). Anyone know the PID code to get this info? I've searched online but can't find it anywhere. Thanks in advance for the help. And for all the folks that will say "take it to the dealer" thanks but that's really not what I'm looking for so just keep that to yourself please.

Boston_Pilot · Oct 30, 2019

jharvey1984 said:
Hi guys/gals. Long time lurker fist time posting. We have a 2018 EX-L 9 speed with about 52k and it is showing the transmission fluid change is due. I have the service manual info, the 3.1 fluid, and am perfectly capable of performing this maintenance myself save one detail. I cant figure out how to get the tranny temp to display on my OBD II app (I use torque). Anyone know the PID code to get this info? I've searched online but can't find it anywhere. Thanks in advance for the help. And for all the folks that will say "take it to the dealer" thanks but that's really not what I'm looking for so just keep that to yourself please.

Joined 31 minutes ago, and attitude already.....good luck pal.

jharvey1984 · Oct 30, 2019

I'm sorry if I came across with "attitude" as that was not my intention. I tried to be as polite as possible in my request.

marmaladeboy · Oct 30, 2019

Google-fu returned various threads from different makes (Toy, Honda, etc). This one seemed relevant in your case.

Getting A/T temp and rear diff temp from the MID or ODB-II

I tow a 4000lb travel trailer with my '08 MDX, and based on other threads I'm concerned about wear on the drivetrain. I'd like to be able to get transmission and rear differential temperature readings (and oil temp, too) I know the MID in the dash can pop up an alert if the transmission temp...

www.mdxers.org

Quoted post from that thread I linked:

I figured out the answer to this recently, and I wanted to post it for others since the info seems to be incredibly hard to come by.

First, I have a 2008 MDX. I'm fairly sure this method will work on the 2007-2009 models. Most likely it will also work on the 2010-2013, since I think they have the same transmission. I have no idea if this will work on the 1st gen (2006 and prior) or the 3rd gen (2014-present), but if does please post a reply for everyone else.

Ok so what I did to make this work was to buy a $20 ELM327 OBD-II wifi dongle from Amazon and the $6 EngineLink app for iPhone. The Transmission Temperature is accessible with a custom PID, so I just had to create one with the following info:

Header: 18DA1DF1
Mode and PID: 222201
Name: A/T Temp
Minimum: -40
Maximum: 300
Unit type: F
Equation: AA*(9/5)-40

(Note: Scale Factor was not requested but if you use a different app that asks it just use x1).

This seems to work well. When completely cold (sitting overnight) my trans temp was pretty close to the ambient air temp. Driving it around town with the air temp close to 90 today it got up to about 152. I haven't tried towing yet but when I do that I'll update this post.

For those curious, I got the info above from one of the Honda Odyssey forums. The info on the Ridgeline owners forum is similar. I spent quite a bit of time researching this, reading up on the OBD2 protocol, etc so I'm pretty confident at this point that the numbers are reading pretty accurately.

BTW if you use Torque I found the following values, which should work for you as well:

ATF Temp
TXD:1DF1222201
RXF:032400000000
RXD:2808
MTH:00090005FFD8
NAM:ATF

Protocol: 29-bit CAN

Now that I have this working, I'm going to spend some time with my android tablet and TorqueScan to see if I can find some other hidden temperature PIDs that will allow me to read rear diff and VTM temperatures.

jharvey1984 · Oct 30, 2019

thanks marmalade. I had seen that thread and tried those PIDS but they seem to be for previous generation trannys and dont work for the 9 speed in my ody.

Ekalb · Nov 12, 2019

jharvey1984 said:
thanks marmalade. I had seen that thread and tried those PIDS but they seem to be for previous generation trannys and dont work for the 9 speed in my ody.

This scan tool includes free software for one specific manufactures and is supposed to have many features of HDS. You could give it a try and see if it includes live data for transmission temperature, if not return it.

Autel AP200
https://www.amazon.com/dp/B07QD4GZW4/ref=cm_sw_em_r_mt_dp_U_JcSYDbP9BN181

Elladara · Aug 23, 2023

Did you ever find an answer to the question?

TSQ · Aug 24, 2023

See my post here: Transmission Survey + 9/10 speed detailed info (One...

Ekalb · Aug 24, 2023

I got it working on my old Android phone using Torque and a $20 ELM327 dongle so I know it is possible. I'll have to try it again on my iPhone and I'll report back. I'm due for a transmission service so I'll need to figure it out soon.

PID for transmission temperature (2018 EX-L w/ 9 speed)

jharvey1984

Boston_Pilot

jharvey1984

marmaladeboy

Getting A/T temp and rear diff temp from the MID or ODB-II

jharvey1984

Ekalb

Elladara

TSQ

Ekalb

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