What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Doubeleive]

500w or 700w fan motor?

700w+700w, it's a hummer fan shroud 7/9 blade

 

[Rocket Man]

The AutoSync has programming mode now, so you don't need an Autocal to flash the BCM. The file is either sent on a microSD card that plugs into the AutoSync or it updates over the air, not sure which exactly.

That’s nice. I already had an Autocal so I just needed to buy the BCM tune.

 

[Sparksalot]

5?! I thought the spare tire does not have a sensor on these cars.

Mine are both police models and came with spares that matched the 4 road tires and wheels. The rig I had done still had the original spare in place when I got it.

 

[me88]

Mine only shows tire pressures for front left & right and back left & right, no spare tire in the DIC.

 

[Sparksalot]

Mine only shows tire pressures for front left & right and back left & right, no spare tire in the DIC.

Oh I see, I misread your comment. Mine won’t display the spare either just the 4 you tell it are mounted. I do keep the spares in the tire rotation pattern, so make sure those are working as well.

 

[89Suburban]

Mine only shows tire pressures for front left & right and back left & right, no spare tire in the DIC.

Oh I see, I misread your comment. Mine won’t display the spare either just the 4 you tell it are mounted. I do keep the spares in the tire rotation pattern, so make sure those are working as well.

Yup you can only program 4 tires to read but you could skip a tire and trick the truck into reading the spare, not that that would make any sense. So any time you rotate them and flip with a spare you need to re-learn them to the correct positions.

 

[RooTBeeRthe1st]

112 - 78.1 = ?

They aren't for making the wheel stick out more, but centering my aftermarket wheels on the hubs perfectly. I didn't realize there was a difference until I took them off the truck to swap on my Nissan winter wheel/tire combo (Nissan also used a 78.1mm hub).

These ones: https://www.amazon.com/gp/product/B09BHV3PRT/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&th=1

Oh, my bad. That makes more sense.

The only other workaround is a BCM flash from BT Dieselworks. You need an Autocal and then he’ll email you the file. His Autosync won’t disable hyper flash for the GMT 900’s. I did the BCM flash on my 08 Silverado.

That's unfortunate...

Yesterday afternoon, normal.
This morning, hyperflash.
This afternoon normal again.

 

[Fless]

Yup you can only program 4 tires to read but you could skip a tire and trick the truck into reading the spare, not that that would make any sense. So any time you rotate them and flip with a spare you need to re-learn them to the correct positions.

For my '04 in the Tech 2 there is an on/off switch for a TPMS in the spare. Not sure if or how it would show up in the DIC if I turned it on.

 

[Rocket Man]

Oh, my bad. That makes more sense.

That's unfortunate...

Yesterday afternoon, normal.
This morning, hyperflash.
This afternoon normal again.

I found on mine it depended on if the headlights were on or off. I have all LED, in every socket, plus quad retrofit Morimoto headlights. I tried resistors in all kinds of configurations- different resistances, on every turn signal bulb which includes 4 up front plus the rear which are arrays. I could never get them to not hyper flash at all. One resistance would make them not do it with the headlights off, but if the headlights were on it would start doing it. Another resistance would work with the headlights on but as soon as they were turned off it was back. So frustrating. Since the BCM flash, I removed all the resistors and have never had a problem.

 

[Sparksalot]

Yup you can only program 4 tires to read but you could skip a tire and trick the truck into reading the spare, not that that would make any sense. So any time you rotate them and flip with a spare you need to re-learn them to the correct positions.

I’ve done that before. When the first sensor failed. Worked for two whole weeks, then the others went.