Fuel Gauge pegged at full

Chaser777 · November 25, 2024

Just picked up a new at4 2500 GMC. Put a little over 75 miles on it and noticed the fuel gauge is still at complete full. The range mileage has come down, but the gauge has not moved. I noticed when I turn the vehicle off, the little vertical white bar stays at the full level, but that bar slides fully to the left on the other gauges such as engine temp, volts, etc. When I turn the vehicle on, those little white indicator bars slide from all the way left, to current readings, where the fuel gauge is already pegged to the far right. This AM I stopped to put fuel in just to see where it was at and it took 7 gallons. Seems odd that the miles to empty seems to be reading correctly, but gauge is pegged at full?

Also, the right turn signal doesn't automatically turn off about every fifth time I use it. I have to manually turn it off. It also seems very hard to turn the blinker lights on compared to my previous ride, 2018 GMC HD Denali.

BuckWallace · November 25, 2024

I'd give it some more time/miles and see if the fuel gauge moves at all. As for the blinkers, my turn signal lever on my 2024 has always been very hard to turn on and off. Turning off a right signal was especially difficult, so I had the dealer look at it and they agreed. They replaced the lever and now turning off a left signal is difficult... Not sure if it's the lever or something in the steering column.

Chaser777 · November 25, 2024

thanks for the reply. I'll give it more time. See what happens. I also noticed the shifter lever for going into gear seems very stiff. Have to pull pretty hard to get it into gear. Not a big deal, but so much different than previous GMC truck. Love the truck so far. For a 3/4 ton, ride isn't too bad and I have a snow plow/camper prep package on it too.

revrnd · November 26, 2024

I have a 2024 with 4500 miles on it. No issues that you speak of. In fact I've noticed the turn signal 'cancels' w/ a reduced turn. In the past turning into my village on a slight curve I'd always forget to turn off the turn signal and it would continue to flash. W/ this truck, when I correct the wheel, the turn signal turns off.

bruceb58 · November 26, 2024

What does the MyGMCApp say what is has in percentage? It will have a number that is actually read from the sensor and displayed as a number.

Chaser777 · November 28, 2024

So as far as the gas gauge goes, it finally did move off of Full. Seems to be working. I can’t get the GMC app to work to read percentage. Been on the phone with onstar 3 different times, plus the half hour initially spent at the dealer trying to unsuccessfully activate it when i picked the truck up. Last call with onstar they said i should make an appointment with the dealer as they now couldn’t even locate my truck via GPS. Suspect a hardware issue. Used the GMC app with my 2018 Denali and it worked flawlessly. Really enjoyed it.
The right blinker problem continues. Made four consecutive right turns going around the neighborhood and it wouldn’t automatically click off for any of those turns. If I turn the wheel back and forth a couple times after the turn, it would then click off. Always works normally when using the left blinker. It doesn’t seem like it takes any extra force to turn right blinker on versus left blinker. I tried to just leave it blinking after the right hand turn to see if it would eventually turn off but went over a block and it still didn’t click off. Im just going to keep an eye on it and hope it gets better. Can’t see taking it back for this minor issue, but will let them know about it next week. Loving everything else about the truck so far.

rtreptow7 · December 26, 2024

Finally got a chance to take it in for blinker. Tech said switch wasn’t installed correctly at the factory. Seems to be working now.

Chaser777 · January 22, 2025

FYI=rtreptow7 is me too.

Blinker problem is not resolved. It started acting up just a day after it was fixed. Same thing, right blinker wouldn't cancel. Took it back. They said their is a TSB for this issue stating switch needs to be removed and reinstalled. So they basically did the same thing and said that it may fail again and there may be a more robust switch mount available at a later date When\if GM issues a better fix. Said something changed from 2024's to 2025's with the way it mounts.

Chaser777 · February 19, 2025

Still an issue. Failed within a day after the second attempt to fix. Took it back a third time and they replaced the switch, Bracket, and steering wheel airbag coil. On the way home from the shop, right blinker failed to cancel again. Not sure what else is left to fix/replace? I can't be the only one having this issue. Not a hig issue, but sure is getting annoying.

newdude · February 19, 2025

24 minutes ago, Chaser777 said:

Still an issue. Failed within a day after the second attempt to fix. Took it back a third time and they replaced the switch, Bracket, and steering wheel airbag coil. On the way home from the shop, right blinker failed to cancel again. Not sure what else is left to fix/replace? I can't be the only one having this issue. Not a hig issue, but sure is getting annoying.

Older version of the TSB but the same condition and fix is called for - 21-NA-166 1..2

No mention of an updated turn signal multifunction switch. Current switch # came out April 2022 and has been in use since then.

I have a 2022.5 1500 (same interior updates as the 2024+HDs), never had this happen yet. Same bracket and turn signal switch too as yours.

I'd say its another bad switch or there's something else in how its all assembled is off. New switch might not be seated all the way, etc.

Chaser777 · February 21, 2025

The first attempt at fixing was this service bulletin. Remove and reinstall switch. Unfortunately didn't help. I think they did the same thing on second attempt at fixing it, but adjusted or shimmed the bracket, or something like that. Third time they replaced these three parts: Part numbers on replacements they used on third attempt to fix it: 84924355 switch, 86507598 Coil, and 84483956 bracket. Right blinker still doesn't cancel, and now occasionally the left blinker doesn't cancel. Left blinker was never a problem in the previous almost 3 months of owning this truck, always been just the right.

Chaser777 · March 18, 2025

Still a problem. In the past 2 weeks we had 3 days that were really warm for this time of year, 60's and a day in the 70's. During the warm days, the blinker would not cancel in the cool morning, but on my drives back home, both left and right blinker worked flawlessly. Next morning when it was cold again (30's) it wouldn't work. Not sure why it would be temperature related.

GMCustomerService · March 20, 2025

On 3/18/2025 at 12:52 PM, Chaser777 said:

Still a problem. In the past 2 weeks we had 3 days that were really warm for this time of year, 60's and a day in the 70's. During the warm days, the blinker would not cancel in the cool morning, but on my drives back home, both left and right blinker worked flawlessly. Next morning when it was cold again (30's) it wouldn't work. Not sure why it would be temperature related.

This is a strange issue indeed, Rob. Will you please send us an email so we can learn more? We can be reached at [email protected], and ask that you share your full VIN so we can assist. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

Chaser777 · March 27, 2025

Email sent.

Chaser777 · May 5, 2025

Just to update, this problem did finally get resolved. Wasn't clear to me exactly what was done on this last attempt to fix it. No parts replaced, just uninstalled, reinstalled from my understanding. But for the last 2 1/2 weeks it has worked correctly.