So I'm replacing the tires on my truck ('08 Sierra 2500HD), hopefully this weekend. Since I purchased it, I could never get the system to relearn the sensors, it would do something different every time and nothing would sync up properly. I'm not sure if all the sensors working properly, but I don't know how to tell if they are or not.
I read something in the Duramax forums that you have to take it to the dealer and have them reset the TMPS system and they can reflash it to get it working again. When you have the tires changed and the system doesn't go through the relearn mode, it goes all wonky and it has to be dealt with by the dealer.
Is this true, or is there another trick to make this work?
Getting into relearn mode should be as simple as turning the ignition on, then holding the lock and unlock buttons on the keyfob simultaneously. Then you'll get the double horn honk and you go around deflating tires or using the activation tool until the horn does a single honk to let you know it saw that tire. TPMS relearns are industry-standard relearned from left front clockwise to left rear, and GM is kind enough to light up the turn signal bulb at the corner it's looking at next.
The only time I have ever had problems with a GM this new are because the owner did not have an OE key fob. That part is critical. That or they had spare wheels from an older truck, there was a sensor firmware change at some point and the two aren't compatible.
I bought a relearn tool. Put it into relearn mode with the key fob, zap the tires by the valve stem as instructed. Less than $50 on eBay. I never could get the raise/lower pressure method to work.
They changed the system annually for a while. If you dont have the right procedure, they can be a fussy bitch of a thing. I fought with a GM car for almost an hour one day, trying to get my Bartec tool to register the sensors. I walked away frustrated, my parts guy does it in two minutes with the pressure drop method. Fak. Other problem I've found is they want you to run 80 psi in the rears all the time on a 2500. It would be nice to be able to drop the pressures empty.
I've got a 2012 Tahoe.
Apparently at a certain point, the pressure drop method was eliminated from the system-- I couldn't make it work.
I ended up buying a tool through Amazon-- this one, and it does the job with the key fob procedure as described in the owner's manual.
Knurled wrote:
Getting into relearn mode should be as simple as turning the ignition on, then holding the lock and unlock buttons on the keyfob simultaneously. Then you'll get the double horn honk and you go around deflating tires or using the activation tool until the horn does a single honk to let you know it saw that tire. TPMS relearns are industry-standard relearned from left front clockwise to left rear, and GM is kind enough to light up the turn signal bulb at the corner it's looking at next.
The only time I have ever had problems with a GM this new are because the owner did not have an OE key fob. That part is critical. That or they had spare wheels from an older truck, there was a sensor firmware change at some point and the two aren't compatible.
That's the problem, this is the procedure and it isn't working. I can start the relearn procedure and 9 times out of 10 it won't pick up the first sensor and then when it finally does, it won't pick up the next Sensor.
I may have to get the tool because the air drop method isn't working.
