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I have a 2003 Yukon Denali. The temperature gauge in the

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lower left corner of the...
I have a 2003 Yukon Denali. The temperature gauge in the lower left corner of the instrument display, no longer registers a temperature. I believe this gauge is for the transmission fluid temperature??In addition to the temp gauge not working, I noticed the transmission is not changing gears like it normally would at certain speeds. The vehicle revs higher than normal before shifting into second gear.Furthermore, I am low on transmission fluid. I checked it while the engine was running and the level is at the "cold" line.) so I will add more fluid.But I need to know the location of the transmission fluid temperature sensor, and instructions for replacing it, to see if that is why the gauge is not working.I also need to know if the 'shifting' issue is related to the temperature sensor/gauge not working, or if it related just to the trans fluid being low.
Submitted: 2 years ago.Category: GMC
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Answered in 36 minutes by:
12/18/2015
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago
AZTechBrian
AZTechBrian, ASE Certified Technician
Category: GMC
Satisfied Customers: 732
Experience: Owner
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Hello. Is your Denali a 2 or***** and what engine is in it? I will see if I can get the information your looking for.

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Customer reply replied 2 years ago
All wheel drive. 6liter v-8
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Ok. 1500, or 2500?

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Customer reply replied 2 years ago
I think the problem was just low transmission fluid. After filling it up the temperature gauge is working. I guess I was just severely low on fluid. I hope the transmission shifting problem goes away too.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

the shifting problem is most likely the result of low fluid. The temperature sending unit is located higher up in the transmission, so if the fluid was low enough, there wouldn't be enough fluid surrounding the sending unit to give an accurate reading. I have attached a picture with it's location. Item 34.

https://www.dropbox.com/s/7tlju7bonw3odly/tts.jpg?dl=0

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GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

sorry that picture wasn't very good. here's a better one

https://www.dropbox.com/s/383y2xd3s0fwy52/f.jpg?dl=0

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Customer reply replied 2 years ago
I added almost 2 pints of transmission fluid. The temperature gauge is registering a temp after driving around for twenty + minutes. However the vehicle isn't shifting gears like it normally does. Does the computer need to be reset or something? It stays in all the gears way too long before changing gears.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Hopefully there wasn't any internal damage done. Does it eventually shift through all the gears, but just takes a while before shifting? Are you able to get a scan tool and check for transmission codes? I am reasonably certain that there are codes and they would help us greatly if you can get them..

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Customer reply replied 2 years ago
I haven't tried keeping the accelerator down to see if it shifts from 1 to 2 all on its own. When it revs to high in first gear, I take my foot off the accelerator for a quick second, and then it shifts into second. Shifting from second to third seems a bit better. it's hard to tell on the freeway what gear it's in, but at 65mph the rpm is between 2500 and 3000.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Ok. It sounds like what you have is delayed shifts. It would be great to have the codes, but you may need your valve body reconditioned. This was a fairly common problem with your Denali and GM did provide instructions for reconditioning these valve bodies. There is also a TSB for it

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Customer reply replied 2 years ago
I have a scanner that reads codes from the obd2 port but there are no codes. is that the scanner I need to read transmission codes?Also is recondidtioning those valve bodies something I can do or do I need to see a transmission mechanic like aamco?
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

You would get the codes from the OBDII port but your scan tool would need to be capable of reading transmission codes. I will attach a copy of the TSB with the information that covers among other things, a delayed shift condition.

https://www.dropbox.com/s/qozggm1yajohm0f/TSB.pdf?dl=0

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Customer reply replied 2 years ago
Does that document apply to Yukon Denali non XL? Mine isn't an XL.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

It's the same transmission either way, but isn't your denali a 1500? (half ton)

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Customer reply replied 2 years ago
I'm not sure how I know if its a 1500 or not. I know its a V8 6.0L engine. Under the hood it has Vortec 6000 on plastic engine cover. In the TSB, are those the codes I would expect to receive from a delayed start problem?
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

It must be a 2500. The 1500 with the 6.0 was only availabe in XL. Anyway, thats not important. When you say delayed start, do you mean you give it the gas when it's cold and the motor just revs?

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Customer reply replied 2 years ago
oops...my bad. I meant to type delayed "shift". those words I think best describe what its like to drive the vehicle.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

You wouldn't necessarily get all those codes listen in the TSB for a delayed shift issue. You could have some of those codes or symptoms or a combination of them.

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Customer reply replied 2 years ago
The odb2 scanner I have says it reads all power train codes for any make and model after 1994. Would the codes in TSB make the check engine light come on? Regardless my scanner is reading 0 codes and the check engine light is not on
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

In most cases a power train code will illuminate the light. Not always but usually. Regardless of whether or not there are stored codes, we do know that you have a transmission problem as delayed shifting is not normal. Delayed shifting is usually caused by sticking valves in the valve body, and it so happens that your transmission's valve body was prone to problems to the point that a TSB was issued for it. Even though your not finding any codes, I would perform that TSB.

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GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

If the computer doesn't recognize the issue, a code won't be stored. We see vehicles every so often that have a clear problem, misfires, etc.. and no CEL (check engine light). It just makes it a little more difficult to find the problem when that happens..

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Customer reply replied 2 years ago
What do you think about the theory that the 2-4 band broke. so rather than a "delayed" shifting, its actually a shift from 1-3 because the 2-4 band broke? This is what a local transmission shop says is more likely the problem than a sticky valve. I drove the vehicle on the freeway and it doesn't seem to shift into 4th gear. Driving on regular streets does seem to shift from 1-3 and miss the second gear.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Woah, that's a bit of a twist.. Based on that last reply, I would be pretty confident that there is internal transmission damage. This no longer sounds like a simple delayed shift condition that does shift through all the gears.

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GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

skipping over second is exactly what would happen too if your 2-4 band broke

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Customer reply replied 2 years ago
I drove it today and paid closer attention to the shifting and it definitely seems to only hit two gears. if the 2-4 band is broke, how much should I expect to pay to fix? Is the "2-4 band break" the definition of a transmission rebuild? the local transmission expert says at most it would cost $2400 to replace/rebuild, or if the 2-4 band can be replaced it would be only $1200. To determine the cost he says he must drop the transmission pan to see if the band break caused other damage.
GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

The 2-4 brake band is roughly a 10 hour job. The transmission must be removed to replace it. The 2-4 band is removed toward the beginning of the disassembly process, but it's a good idea to replace the clutches either way. He would have to remove the pan to see the 2/4 brake band to make a determination as to the extent of the damage, as he has said.

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GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

OH, I'm sorry I didn't answer your first question... The 2-4 brake band doesn't define a transmission overhaul. There's a lot more to an overhaul than that band. Much more dissassembly and reassembly and many more parts. Overhaul is a 15 hour job. ( including removal and installation of the transmission)

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GMC Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

was it a broken 2-4 band?

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