Update to adding trans temp gauge...

[HiHoeSilver]

Thanks for the great info in this thread. There is some disparity in what model year cluster can just add the stepper motor. The reason I say this is my 2004 Tahoe has a build date of 06/03 which made me think mine would be just a stepper motor add-on. With 03 being an easy add, I made the leap of faith that an 06/03 build date would have it be able to display trans temp.

However, I have read somewhere that the tell tale sign of whether your cluster will work right out of the gate with the addition of a stepper motor is that the cluster will have the light bulb for trans temp gauge pre-installed on the board above where the trans temp gauge is. My board does not have the light installed there. I have the overlay and needle but never bothered installing them because it probably wouldn't work.

Anyone else heard that one about the light being in place on the board is the sign of whether it is ready to display trans temp?

Would the OP be interested in turning on the function for other's clusters? I don't know that I want to bother with the eprom reader if it will only be used one time? What other use could it be put to? Thanks in advance.

I have not heard the light bulb thing. Interesting. I've just read that the 04 MY vehicles some work and some don't.

I wondered about the eeprom, too. But for $15, I think I'll just do it. I have yet to check with a couple techie friends who may already have one.

 

[mattt]

Are you saying you located the eprom programmer for $15? The OP linked to one that is $60 if I remember correctly.

 

[HiHoeSilver]

Are you saying you located the eprom programmer for $15? The OP linked to one that is $60 if I remember correctly.

His second link in that post.

 

[DougAMiller]

Never heard anything about trans temp backlights being there when the gauge wasn't. Might be true, just never heard of it.

As for your question about turning on the feature. I'm still working on figuring out the rest of the contents of the eeprom, so no guarantee that there aren't some subtleties that I don't yet understand. But, at least in the two clusters that I have programmed, it is pretty simple.

In general I am happy to help others out, and don't mind doing it. I am a little concerned about being held responsible if something were to go wrong.

 

[Atrus]

@DougAMiller - awesome information! Thank you for sharing it!

So, if I am reading this correctly....I SHOULD (I know nothing is guaranteed) be able to add a stepper motor and HD/Denali gauge overlay (and potentially an illumination light) to my 2003 Yukon and the trans temp should work? No programming should be required?

And, if programming is required, I unsolder that chip, use one of the readers you listed, change the bit from that one string from "1" to "0"?

That'd be great news for me - I'd like to get one in our '04 Suburban as well, but the '03 Yukon is the priority as I plan on setting it up as a tow rig for our travel trailer, and light snowplow duty. Trans temp would be very helpful to know in those scenarios. I've already rebuilt the cluster once, but one of the replacement motors is wonky so I need to crack it open again anyway.

 

[HiHoeSilver]

@DougAMiller - awesome information! Thank you for sharing it!

So, if I am reading this correctly....I SHOULD (I know nothing is guaranteed) be able to add a stepper motor and HD/Denali gauge overlay (and potentially an illumination light) to my 2003 Yukon and the trans temp should work? No programming should be required?

And, if programming is required, I unsolder that chip, use one of the readers you listed, change the bit from that one string from "1" to "0"?

That'd be great news for me - I'd like to get one in our '04 Suburban as well, but the '03 Yukon is the priority as I plan on setting it up as a tow rig for our travel trailer, and light snowplow duty. Trans temp would be very helpful to know in those scenarios. I've already rebuilt the cluster once, but one of the replacement motors is wonky so I need to crack it open again anyway.

You are correct. Your 03, according to most, will just work by adding the stepper, face, and needle. Your 04 MIGHT work that way, too. If not, @DougAMiller's eeprom programming will do the trick, it seems.

 

[Atrus]

Awesome! I'll keep an eye out for an HD or Denali cluster next time I am at the pick 'n pull!

 

[DougAMiller]

@DougAMiller - awesome information! Thank you for sharing it!

So, if I am reading this correctly....I SHOULD (I know nothing is guaranteed) be able to add a stepper motor and HD/Denali gauge overlay (and potentially an illumination light) to my 2003 Yukon and the trans temp should work? No programming should be required?

And, if programming is required, I unsolder that chip, use one of the readers you listed, change the bit from that one string from "1" to "0"?

That'd be great news for me - I'd like to get one in our '04 Suburban as well, but the '03 Yukon is the priority as I plan on setting it up as a tow rig for our travel trailer, and light snowplow duty. Trans temp would be very helpful to know in those scenarios. I've already rebuilt the cluster once, but one of the replacement motors is wonky so I need to crack it open again anyway.

That's right. Although the chip can be reprogrammed on the board. You don't have to unsolder it, although you can do it that way too. You just need a SOIC8 test clip that connects to all of the pins so that you can connect wires to them. Like this one

 

[gooffeyguy]

I added a trans temp gauge about 10 years ago to my 2001

well, it's actually a ScanGaugeII that's mounted above the 3 12v outlets and plugged into the OBD port. I have it configured to show 4 gauges:
-Oil Life
-Trans temp
-Coolant temp
-Average MPG

 

[Tonyrodz]

I added a trans temp gauge about 10 years ago to my 2001

well, it's actually a ScanGaugeII that's mounted above the 3 12v outlets and plugged into the OBD port. I have it configured to show 4 gauges:
-Oil Life
-Trans temp
-Coolant temp
-Average MPG

Have a pic? Sounds interesting.

 

[gooffeyguy]

Have a pic? Sounds interesting.

Kid has the Yukon at college (Mizzou) right now. Will be back this weekend and I'll get a pic

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[mattt]

I have used the same ScanGauge II in my 04 Tahoe, that I had bought for a Ford diesel I had. After programming in the code for the trans temp on my Tahoe, I do use it when I remember to plug it in and bring it on my trip. I never mounted it permanently though. Good idea mounting it there.

https://www.scangauge.com/products/scangauge-ii/

 

[Rocket Man]

Kid has the Yukon at college (Mizzou) right now. Will be back this weekend and I'll get a pic

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

Oh crap. Might just be better to NOT take any pics after. You know, what happens at Mizzou stays at Mizzou lol.

 

[gooffeyguy]

I have used the same ScanGauge II in my 04 Tahoe, that I had bought for a Ford diesel I had. After programming in the code for the trans temp on my Tahoe, I do use it when I remember to plug it in and bring it on my trip. I never mounted it permanently though. Good idea mounting it there.

https://www.scangauge.com/products/scangauge-ii/

It wasn't "permanent", I used a strip of velcro on the bottom of it to stick it to that ledge right above the tape deck. When the 12v outlet door is flipped down it fits perfect in the cutout.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[gooffeyguy]

Have a pic? Sounds interesting.

Got a pic of it today while I was changing the oil and doing a tire rotation.

The 4 gauges showing are Oil Life, Average MPG, Water Temp, and Trans Temp.

I can press the white button in each corner and scroll through different stuff to display. Volts, MPH, IAT, RPM, HP, TQ, MAP, TPS, Fuel Pressure, IGN Timing, etc

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[jwth]

Here is a bit of what I have figured out.

The odometer value is repeated three times for data integrity. First two bytes are the most significant and the least significant byte is roved over the next 10 bytes since this is written every 1/10 of a mile and the EEPROM is spec'ed for 1 million write cycles. This would stay within spec for 1 million miles.

Engine hours is stored once as four bytes, although I can't imagine needing the fourth byte, divide by 10 since it is recorded to 1/10 of an hour, and it is stored LSB→MSB.

TransTemp 0x000059 0 - Yes 1 - No

Vehicle Settings
0x00005A 0 - English 1 - French 2 - Spanish
0x00005B 0 - Imperial 1 - Metric

The VIN is stored as plain text, that is, the characters are encoded in ASCII and written as hex.
Last 4 characters from label bar code stored as plain text, serial number maybe?
GM 8 digit Part Number for cluster is stored in hex format MSB→LSB
Cluster model ID is 4 large characters from the label. Also stored as ASCII plain text.
Trip meter value is in speedometer pulses, e.g. miles = value/4000, it is stored LSB→MSB. Took me a while to figure out how they were encoding this, but it means that your trip meter is accurate to about 15 inches!. It's probably only updated in volatile memory and stored periodically or at shutdown, otherwise it would wear out the memory location pretty quickly.

Not stored in cluster:
Vehicle settings menu, except language (1) and units (2)
Timer
Fuel used


View attachment 218561

Gray blocks are the same in every memory dump I have looked at, and are mostly zero and probably unused. Still trying to figure out the gauge calibrations, which I think are stored somewhere in the white blocks.

Thanks for the post and info Doug
I just changed the bit in my 2005 yukon and added the trans temp motor, all worked as you indicated.
BTW there was no bulb at the trans temp location.
Great Info!

 

[DougAMiller]

Glad I could help. Spent a lot of time trying to find this information before I finally figured it out for myself. Hopefully, having it posted here will make it easier for others that want to add the gauge.

 

[Al90iroc6]

Hey, so I stumbled upon this thread as I am doin the gauge in my 07 classic silverado and I pulled the bin file and 00x000059 is already 00 on mine yet trans temp is inop....am I maybe looking at the wrong slot?

 

[toddis32]

59 should be at 00 always on all 03-06 models and also. You can have the entire service done for 95.00 including the parts. GM Gauge Repair in Wisconsin.

 

[mo2058130]

Thanks for the post and info Doug
I just changed the bit in my 2005 yukon and added the trans temp motor, all worked as you indicated.
BTW there was no bulb at the trans temp location.
Great Info!

Hey there, where did you get your parts? I have an 05 XL.
Thanks!


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