Transmission senor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andy4639 · 02-07-2014, 10:46 PM

OK so the tune is done. I need to know if I can get the transmission temperature reading from the 4l80e wiring are not. I would like to have it on the Scan gauge if possible. I have the code for it entered and the gauge set but it has no reading. This is for a 2003 2500HD 6.0.

According to Scan Gauge they swapped codes for everything in 2003.
I have tried both sets of codes but no good.
Bruce said without a Vin number for the vehicle there is noway to know.

Andy4639 · 02-07-2014, 11:04 PM

I found this info.

http://www.rostratransmission.com/manuals/Form4157C.pdf

**truckdude239** · 02-08-2014, 01:37 AM

Trans should have a sensor in it already.

BR3W CITY · 02-08-2014, 04:07 AM

I'm not positive how it works. I know it can throw over-temp codes, and HPT can read the info.

We've installed a trans temp gauge before on a diesel truck with the 80e....there are unused bungs on the side of the case which are for testing pressure or something. You can use the 1/8" hole to connect the sender for Autometer-type gauges.

Andy4639 · 02-08-2014, 07:39 AM

Yes I have read there is a test port right above the gear selector on drivers side. I have also herd that the transmission should have the temp senor in it. Bruce said he was going to findout more for me but I was wanting to see if I could find anything. I figured the experts here would know more about it. I'm going to go by the transmission shop one day next week and findout what they have to say about it.

I found this too!

http://www.trucktransdiag.com/downlo...-tech-info.pdf

From what I have found this morning googling it should have a senor in it. I have to figure out how to get the info now and if it was turned off when they did the wiring and reflash.

**Hart_Rod** · 02-08-2014, 11:24 AM

I looked in the tune for a 2500 HD with a 4L80 but didn't see anything that addressed the temp in the tranny. I know my 6L80 has all those features and I can see the temp on my DD VHX gauges as well as my scanner. If you guys figure something out, let me know and I will check again.

Edit: Ask Clinbarger, he's the resident tranny expert!

68GMCCustom · 02-08-2014, 01:35 PM

My Aeroforce Interceptor will display trans temp.
Only "sensors" on my 4L85e are the 2 VSS?

ls1nova71 · 02-08-2014, 02:12 PM

Have you tried another year? I don't think your engine is an 03. Try 01 and see what happens? Some 2500 and up trucks have a trans temp guage so the trans may have the sensor already, but its most likely a serial data gauge, but I would think a Scangauge should read it if its there.

68GMCCustom · 02-08-2014, 05:13 PM

both my '68 with it's '09 LY6 w/4L85e... and my TBSS with '06 LS2 w/4L70e... I've been able to just plug in, set it, and pull trans temp from the diagnostic port, w/o adding/changing anything to either system.

68c10airstream · 02-08-2014, 05:46 PM

Hi Andy, just looked up your info request on a 2003 2500hd 6.0 on alldata pro version and the trans temp thermistor info goes to pcm and is available at the instrument cluster through the class2 serial data. This serial data carries other info, volt gauge info, etc. Your posted link info showed the 2 wires related to trans temp info on a 5 volt reference line to pcm. The pcm analizes all the info needed and sends it out on serial data line. I always compared the serial data line to a phone line, transmitter, receiver and more than one person on-line processing the info. Good luck, Brian F.

clinebarger · 02-09-2014, 02:21 AM

On later 4L80E's the Temp Sensor is integrated into the internal harness.

Even if the sensor/wiring had an Open circuit it would read "Low" around -40. If the sensor/wiring had a Short it would read "High" around 300 degrees.

First thing I would do is hook-up a real scan tool a see what the Trans Temp reads.

Circuit Diagnostics....
Unplug the Trans connector, Key on, Check for 5 volt reference on Pin L, Check for Ground on Pin M. This will check the harness side. See Connector View.

On the Trans side, Check Resistance between Pins L & M, See resistance chart.

Andy4639 · 02-09-2014, 07:06 PM

Thanks guy's. Sorry I been out of town since early yesterday for a wedding. No computer time. Just got back. Will check tomorrow on the scanner tool.
I sure hope I can figure it out. It would be nice knowing trans temp.

02-07-2014, 10:46 PM	#1
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Transmission senor OK so the tune is done. I need to know if I can get the transmission temperature reading from the 4l80e wiring are not. I would like to have it on the Scan gauge if possible. I have the code for it entered and the gauge set but it has no reading. This is for a 2003 2500HD 6.0. According to Scan Gauge they swapped codes for everything in 2003. I have tried both sets of codes but no good. Bruce said without a Vin number for the vehicle there is noway to know. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-07-2014, 11:04 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Transmission senor I found this info. http://www.rostratransmission.com/manuals/Form4157C.pdf __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-08-2014, 01:37 AM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Transmission senor Trans should have a sensor in it already. __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

02-08-2014, 04:07 AM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Transmission senor I'm not positive how it works. I know it can throw over-temp codes, and HPT can read the info. We've installed a trans temp gauge before on a diesel truck with the 80e....there are unused bungs on the side of the case which are for testing pressure or something. You can use the 1/8" hole to connect the sender for Autometer-type gauges. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

02-08-2014, 07:39 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Transmission senor Yes I have read there is a test port right above the gear selector on drivers side. I have also herd that the transmission should have the temp senor in it. Bruce said he was going to findout more for me but I was wanting to see if I could find anything. I figured the experts here would know more about it. I'm going to go by the transmission shop one day next week and findout what they have to say about it. I found this too! http://www.trucktransdiag.com/downlo...-tech-info.pdf From what I have found this morning googling it should have a senor in it. I have to figure out how to get the info now and if it was turned off when they did the wiring and reflash. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 02-08-2014 at 08:29 AM.

02-08-2014, 11:24 AM	#6
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Transmission senor I looked in the tune for a 2500 HD with a 4L80 but didn't see anything that addressed the temp in the tranny. I know my 6L80 has all those features and I can see the temp on my DD VHX gauges as well as my scanner. If you guys figure something out, let me know and I will check again. Edit: Ask Clinbarger, he's the resident tranny expert! __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

02-08-2014, 01:35 PM	#7
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Transmission senor My Aeroforce Interceptor will display trans temp. Only "sensors" on my 4L85e are the 2 VSS? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

02-08-2014, 02:12 PM	#8
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Transmission senor Have you tried another year? I don't think your engine is an 03. Try 01 and see what happens? Some 2500 and up trucks have a trans temp guage so the trans may have the sensor already, but its most likely a serial data gauge, but I would think a Scangauge should read it if its there. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

02-08-2014, 05:13 PM	#9
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Transmission senor both my '68 with it's '09 LY6 w/4L85e... and my TBSS with '06 LS2 w/4L70e... I've been able to just plug in, set it, and pull trans temp from the diagnostic port, w/o adding/changing anything to either system. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

02-08-2014, 05:46 PM	#10
68c10airstream Registered User Join Date: Mar 2013 Location: Marquette michigan Posts: 828	Re: Transmission senor Hi Andy, just looked up your info request on a 2003 2500hd 6.0 on alldata pro version and the trans temp thermistor info goes to pcm and is available at the instrument cluster through the class2 serial data. This serial data carries other info, volt gauge info, etc. Your posted link info showed the 2 wires related to trans temp info on a 5 volt reference line to pcm. The pcm analizes all the info needed and sends it out on serial data line. I always compared the serial data line to a phone line, transmitter, receiver and more than one person on-line processing the info. Good luck, Brian F.

02-09-2014, 02:21 AM	#11
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Transmission senor On later 4L80E's the Temp Sensor is integrated into the internal harness. Even if the sensor/wiring had an Open circuit it would read "Low" around -40. If the sensor/wiring had a Short it would read "High" around 300 degrees. First thing I would do is hook-up a real scan tool a see what the Trans Temp reads. Circuit Diagnostics.... Unplug the Trans connector, Key on, Check for 5 volt reference on Pin L, Check for Ground on Pin M. This will check the harness side. See Connector View. On the Trans side, Check Resistance between Pins L & M, See resistance chart. Attached Images

02-09-2014, 07:06 PM	#12
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Transmission senor Thanks guy's. Sorry I been out of town since early yesterday for a wedding. No computer time. Just got back. Will check tomorrow on the scanner tool. I sure hope I can figure it out. It would be nice knowing trans temp. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

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