TPMS

Texas Sandman · April 30, 2017

Anyone know the minimum pressures before the dash alerts you of low pressure warning? Just trying to smooth out the ride a little.

Coby7 · April 30, 2017

7PSI below door sticker setting. So if it's 35 it will set off at 28! Also you can get this modified by dealer or a guy like me that has a TechII if it's a 14 or older.

FASTREDGMC · May 1, 2017

have mine at 55psi, no light and much better ride

newdude · May 1, 2017

Anyone know the minimum pressures before the dash alerts you of low pressure warning? Just trying to smooth out the ride a little.

On my regular cab, the rears would go to about 58psi before the light would trip. I ran 60psi empty all four corners no issues.

7PSI below door sticker setting. So if it's 35 it will set off at 28! Also you can get this modified by dealer or a guy like me that has a TechII if it's a 14 or older.

On the 1500 sure. The light comes on at a certain percentage below, not a specific PSI. 28psi is 80% of 35psi, so the percentage threshold is 20%. HD trucks are typically 55-60spi front, and 70-75psi rear. So, using 60spi front and 72psi rear (typical combo on some), that means the light would trip at 48psi in front, and 57.6psi rear.

Edited May 1, 2017 by 15HDriver

Coby7 · May 1, 2017

On the 1500 sure. The light comes on at a certain percentage below, not a specific PSI. 28psi is 80% of 35psi, so the percentage threshold is 20%. HD trucks are typically 55-60spi front, and 70-75psi rear. So, using 60spi front and 72psi rear (typical combo on some), that means the light would trip at 48psi in front, and 57.6psi rear.

Don't know where you got your info but I got this right out of the manual +/- 7PSI from the listed pressure on the door sticker. (Not a percentage)

newdude · May 1, 2017

Don't know where you got your info but I got this right out of the manual +/- 7PSI from the listed pressure on the door sticker. (Not a percentage)

On my regular cab HD, the rears would go to about 58psi before the light would trip. I ran 60psi empty all four corners no issues.

The HD trucks have a much larger threshold than 7 psi. The 20% deal...28 as a number is 80% of the number 35. So...28%psi is 80% of 35psi, conveniently the difference left is 20%. I only owned a 2015 2500HD for over 2 years. Tire light tripped on at 57psi. Pressure on the door tag was 72psi for the rear. 57psi is 80% of 75psi, giving a 20% gap.

OP has an HD thus the 7spi deal does not apply. He has a 20% window of the front and rear. So, using 60spi front and 72psi rear (typical combo on some), that means the light would trip at 48psi in front, and 57.6psi rear.

Also...just went through a couple owners manual in my desk. 2007 and a 2010 Avalanche. Zero mention of 7psi or +- 7psi. Only an explanation on how the system works. The GM service manuals don't even mention 7psi.

Edited May 1, 2017 by 15HDriver

sdeeter19555 · May 1, 2017

The HD trucks have a much larger threshold than 7 psi. The 20% deal...28 as a number is 80% of the number 35. So...28%psi is 80% of 35psi, conveniently the difference left is 20%. I only owned a 2015 2500HD for over 2 years. Tire light tripped on at 57psi. Pressure on the door tag was 72psi for the rear. 57psi is 80% of 75psi, giving a 20% gap.

OP has an HD thus the 7spi deal does not apply. He has a 20% window of the front and rear. So, using 60spi front and 72psi rear (typical combo on some), that means the light would trip at 48psi in front, and 57.6psi rear.

Also...just went through a couple owners manual in my desk. 2007 and a 2010 Avalanche. Zero mention of 7psi or +- 7psi. Only an explanation on how the system works. The GM service manuals don't even mention 7psi.

Then that was possibly different for different years...my front and rear seemed to have different trigger points. If I ran less than 65psi in the set designated for the rear, it would pop the low tire pressure warning.

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Cowpie · May 2, 2017

I run the pressures the tire maker recommends based on the actual axle loading on the tires and ignore the TPMS. I have become very good at ignoring the light on my 2500. I only air up to the 60 front / 70 rear if I will be doing heavy work. I am not sure exactly at what pressure the TPMS will trip. The DIC warns me when I start the pickup. I just take a glance at the actual pressures to make sure a tire is not down and then dismiss the message and ignore the light. I am getting pretty good at ignoring the seat belt light also when I am out on the property and don't buckle up. Doesn't affect me to where I feel the need to try and get the settings changed to match what I am doing.

Chebbyfan · May 3, 2017

7PSI below door sticker setting. So if it's 35 it will set off at 28! Also you can get this modified by dealer or a guy like me that has a TechII if it's a 14 or older.

I have a 15, and reset mine. I don't think the shop called it a tech2 tho.

Adamrg · June 15, 2017

Not to dig up an old thread, but after a year and a half of ownership, I finally hooked up my dads snap on verus scan tool, and it was able to lower the tpms threshold. Could choose a number of load ranges for the tires, and lower the tpms threshold all the way to 26psi.

Just another option for those of you whose dealers won't recalibrate. If you know of a repair shop with a high end snap on scan tool (other brands may do it as well, I cannot comment on that)

After a year and a half with a light and having to dismiss the notifications every ignition cycle, it's kinda weird not seeing it

SouthernSilveradoGuy85 · June 15, 2017

Not sure lowering the psi would give a better ride, just a more bouncy ride, maybe not as bad on an HD than a 1/2 ton. On my '14 1500 when I had it I would keep mine in the high 40s, usually between 46 and 48. Didn't bounce and hop while not shaking your teeth out of your mouth. If you have the psi too low you'll wear out the sidewall of the tires. and that's the last part of the tire you want to fail. Low psi along side dry rot is what causes a tire to blow. And HD just isn't going to ride like a 1500 unless you put airbags on it.

sdeeter19555 · June 16, 2017

Not sure lowering the psi would give a better ride, just a more bouncy ride, maybe not as bad on an HD than a 1/2 ton. On my '14 1500 when I had it I would keep mine in the high 40s, usually between 46 and 48. Didn't bounce and hop while not shaking your teeth out of your mouth. If you have the psi too low you'll wear out the sidewall of the tires. and that's the last part of the tire you want to fail. Low psi along side dry rot is what causes a tire to blow. And HD just isn't going to ride like a 1500 unless you put airbags on it.

On an HD it makes a lot of difference...takes it from a harsh feel-every-tar-strip to a more manageable and comfortable ride. Not to mention the DIY can rotate tires without resetting the TPMS every time.

I don't regret it, that's for sure...

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Adamrg · June 16, 2017

Yeah go borrow your buddies hd and take a short trip with the tires at 75psi. Then take that same trip with tires at 55psi. Night and day difference. I don't want a 1500 Cadillac feel, but I don't need to knock a tooth out every time I run over a pebble either ?

Chevor · June 16, 2017

I keep all tires at 75-80 psi, two reasons. #1 more pressure mines easier to notice a leak. #2 more time to get somewhere to fix leak.

SouthernSilveradoGuy85 · June 16, 2017

On an HD it makes a lot of difference...takes it from a harsh feel-every-tar-strip to a more manageable and comfortable ride. Not to mention the DIY can rotate tires without resetting the TPMS every time.

I don't regret it, that's for sure...

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Yeah go borrow your buddies hd and take a short trip with the tires at 75psi. Then take that same trip with tires at 55psi. Night and day difference. I don't want a 1500 Cadillac feel, but I don't need to knock a tooth out every time I run over a pebble either

I think I must have mis typed or something. I meant I don't think lowering the psi so low that it's close to the dash light coming on saying it's too low. When I was experimenting with my '14 I tried low 50s (it had 18s with factory SR-As) and I thought I was going to lose teeth. I know of course HDs have a stiffer suspension in the rear. I just meant I don't think you should lower the psi so low that the light could come on just from the temp cooling down or something. A truck tire shouldn't be below 35 in my opinion.