Question on tire pressure

[dougf]

Picked up the new 2020 Ram 1500 Laramie last Friday and took it for a short trip on Saturday (~300 miles.) I noticed the tpms reading were averaging 46-47lb on all 4 tires, which seemed high to me. I checked the door sticker and see that tire pressure should be at 36, so it came from the factory (or the dealership) around 10lb over the recommended pressure. I checked it the next morning with a guage (cold) and the pressure was in the 48lb range. I didn't check the cold pressure on the tpms by taking it for a short ride while the tires were cold, but I have since noticed the tpms runs ~2-3lbs lower than guage pressure on two different guages, and about 1 lb less pressure than another guage. I'm not quite sure which (between the guages and tpms) is more accurate, but I have a feeling the tpms is reading low. Just to be safe, I'm going to bump the pressure up to ~40 on the tpms by using a guage to put it at 42-43 (and add about 5 more when towing.)

Does anyone have more insight into this and see anything wrong with this strategy?

 

[sparkygreen]

I had a similar issue when I tool delivery of my 2019 last year. I was told that the factory over inflates them so they dont have any issues leaking down if the truck ends up setting on the lot for a long time. Could have just been dealer talk, but the only answer I got.

I would just set it at what is comfortable for you. Ive never compared TPMS to an actual pressure gauge, but a couple PSI variance likely wont make a huge difference. I currently run mine in the mid-high 30's cold which turns into high 30's to 40 when hot.

Good luck!

 

[dougf]

I had a similar issue when I tool delivery of my 2019 last year. I was told that the factory over inflates them so they dont have any issues leaking down if the truck ends up setting on the lot for a long time. Could have just been dealer talk, but the only answer I got.

I would just set it at what is comfortable for you. Ive never compared TPMS to an actual pressure gauge, but a couple PSI variance likely wont make a huge difference. I currently run mine in the mid-high 30's cold which turns into high 30's to 40 when hot.

Good luck!

Thanks for the info. I think I'll do the same.

 

[varnerme]

Rebel calls for 55 front and 45 back. When I picked mine up all 4 were around 65, so I lowered to recommended pressure. I think they come from the factory that way.

 

[SD Rebel]

As mentioned, they come over inflated because they can sit for months and over-inflating reduces chance of flat spotting.

The dealership is supposed to adjust the pressures down before delivery, but they forget almost all the time.

 

[BGC]

I’ve been looking for some tire pressure advice so I’m confident this group can help....I have 35x12.5x22 Toyo r/t tires and do have a 3.5 inch lift as well. Rookie question but should I just be following the psi guidelines from Toyo or should I be adjusting for the lift at all? I just use as a daily driver and nothing off-road or off pavement teally even. Thanks for any input!

 

[lenbong]

I’ve been looking for some tire pressure advice so I’m confident this group can help....I have 35x12.5x22 Toyo r/t tires and do have a 3.5 inch lift as well. Rookie question but should I just be following the psi guidelines from Toyo or should I be adjusting for the lift at all? I just use as a daily driver and nothing off-road or off pavement teally even. Thanks for any input!

I’d just follow the rec. from Toyo, the lift shouldn’t have much of an impact on the tires. I’m just glad to hear you aren’t setting them to the 36/38psi that’s recommended for the factory wheels lol, working on 15-20 trucks a day I see tons of people setting their big D or E load tires to like 35 psi and it hurts me inside haha

 

[BGC]

I’d just follow the rec. from Toyo, the lift shouldn’t have much of an impact on the tires. I’m just glad to hear you aren’t setting them to the 36/38psi that’s recommended for the factory wheels lol, working on 15-20 trucks a day I see tons of people setting their big D or E load tires to like 35 psi and it hurts me inside haha

Thanks!

 

[PowerJrod]

Picked up the new 2020 Ram 1500 Laramie last Friday and took it for a short trip on Saturday (~300 miles.) I noticed the tpms reading were averaging 46-47lb on all 4 tires, which seemed high to me. I checked the door sticker and see that tire pressure should be at 36, so it came from the factory (or the dealership) around 10lb over the recommended pressure. I checked it the next morning with a guage (cold) and the pressure was in the 48lb range. I didn't check the cold pressure on the tpms by taking it for a short ride while the tires were cold, but I have since noticed the tpms runs ~2-3lbs lower than guage pressure on two different guages, and about 1 lb less pressure than another guage. I'm not quite sure which (between the guages and tpms) is more accurate, but I have a feeling the tpms is reading low. Just to be safe, I'm going to bump the pressure up to ~40 on the tpms by using a guage to put it at 42-43 (and add about 5 more when towing.)

Does anyone have more insight into this and see anything wrong with this strategy?

Lol mine were at 50psi and I bought my Ram CPO. I aired them down to 40 based on temp changes here in Vegas. Haven't had any issues. I've noticed that slightly over the mark is way better than at or under the printed psi label.

 

[rammx]

I would occasionally have just one tire driver side pressure sensor stop reading showing “—“ and shows “service tire pressure system” message. Once I turned off the truck or driving at lower speed, it would go away and wouldn’t come back up; if I replace the TPMS of that particular tire this will be fix?

 

[SD Rebel]

I would occasionally have just one tire driver side pressure sensor stop reading showing “—“ and shows “service tire pressure system” message. Once I turned off the truck or driving at lower speed, it would go away and wouldn’t come back up; if I replace the TPMS of that particular tire this will be fix?

Signs of a low battery, does it follow the tire if moved to another side? If so, then a replacement is in order, they OEM ones are cheap, the batteries typically last 5-10 years.

 

[Jako]

Signs of a low battery, does it follow the tire if moved to another side? If so, then a replacement is in order, they OEM ones are cheap, the batteries typically last 5-10 years.

2011 Honda Fit that still has original TPMS (1 replaced - road damage) but only has 20K on the odometer.

How Long Do TPMS Sensors Last?

Your tire pressure monitoring system either relies on measuring wheel speed via the ABS wheel speed sensors (which don't have a battery) or uses dedicated air p

tiregrades.com

 

[SD Rebel]

2011 Honda Fit that still has original TPMS (1 replaced - road damage) but only has 20K on the odometer.

How Long Do TPMS Sensors Last?

Your tire pressure monitoring system either relies on measuring wheel speed via the ABS wheel speed sensors (which don't have a battery) or uses dedicated air p

tiregrades.com

It could be the low miles. I think the Fit's batteries are also rated at 5-10 years.

The systems that don't use batteries, like our Toyota C-HR uses a difference in wheel rotation to determine a low tire pressure. Funny thing is, I like to see the actual tire pressure so I use an aftermarket TPMS on that car, which requires me to change batteries on it every 2-3 years lol. Luckily they are stem cover sensors, so I can change them in a minute.

 

[rammx]

Signs of a low battery, does it follow the tire if moved to another side? If so, then a replacement is in order, they OEM ones are cheap, the batteries typically last 5-10 years.

Hi the problem its only in one tire the other 3 dont have any problem; funny thing at this moment the 4 are working i order a replace OEM sensor and replace the one with problem so as you said will be a battery problem,,, the dealer want to charge me $250 usd just for check and they dont want to advise if the change of tire sensor will fix this issue

 

[SD Rebel]

Hi the problem its only in one tire the other 3 dont have any problem; funny thing at this moment the 4 are working i order a replace OEM sensor and replace the one with problem so as you said will be a battery problem,,, the dealer want to charge me $250 usd just for check and they dont want to advise if the change of tire sensor will fix this issue

Never use the dealer while out of warranty.

Discount Tire / American Tire offers free TPMS check, which includes scanning all 4 of your tires, checking batteries in the process. They will do that for free, maybe do that first before going any further, that way you know it's a sensor issue.

If confirmed, you can buy the sensors online, they are cheap $15 or so each, then go to Discount Tire / American Tire, they charge like $20 or so a tire to switch them out. Or they may even offer you OEMs for cheap as well.

 

[rammx]

Never use the dealer while out of warranty.

Discount Tire / American Tire offers free TPMS check, which includes scanning all 4 of your tires, checking batteries in the process. They will do that for free, maybe do that first before going any further, that way you know it's a sensor issue.

If confirmed, you can buy the sensors online, they are cheap $15 or so each, then go to Discount Tire / American Tire, they charge like $20 or so a tire to switch them out. Or they may even offer you OEMs for cheap as well.

Thank you I will do and share the update