Tire air pressures 2014 Ram 2500

[stretch548]

I know what the door panel says and is 60# front 80# rear this seem high if not carring a load any comments thanks
2014 2500 Crew Cab SRW first CTD and love it as long as I can keep it from going into the dealers shop all the time
first time in only had ONE day 25miles come on

 

[Jim W]

I have a 2008 Mega Cab with Michelins 17" tires recommend air pressure on the placard is 60 PSI front and 70 Psi rear when loaded. Light load is 60 PSI front and 45 PSI rear per placard. On my truck the TPMS has never worked correctly so at 45 PSI rear tire pressure the light for low tire pressure will illuminate and ding twice. I have found that if I run the rear tires at 51 PSI or so no light and no ding of the alarm. Hope this helps? Also I would check with the tire company’s inflation tables for your tires as to the proper tire pressure for a lightly loaded truck.

Jim W.

 

[SBreaux]

Stretch,

Here is the story on that. I to have a 14 2500 with the pressure you mentioned. Ram has coded the 14's to comply with the DOT rule which is maximum air of 60 and 80 pounds since the load is unknown. I have been to my dealer and they spent two hours trying to find a way around the programming and no go. I even talked to Firestone about what would be the minimum for the rear. I was told 45 and no lower. However my dealer was unable to find a way around the programming in the 14 which is different than the 13's. Dual rear tires and vehicles over 10k use something different and will not throw an alarm as the 2500 does. Hope this helps. I am disappointed as it makes for a rough ride. I tried mine at 60 and 60 and was not bad but I did not like the light on in the dash and the alarm every time I started the truck.

 

[Jim W]

I would contact Ram not the dealer; I am sure that your owners ‘truck manual has a phone number that you can reach them on. I do not know if these numbers are good any more 1-800-992-1997 or 1-800-853-1403 these are from my manual. One of these phone numbers should work discuss with Ram the light load requirements and the dealer not being able to set the light load for your truck (lower rear tire pressure). This might help you or contact by PM either BOB4X4 or SAG2 these are both Rams technicians who know what they are doing on this forum, they might be able to help also.

Jim W.

 

[Cummins12V98]

72 front 45 rear unloaded you will get a good ride and the best tread life. I easily made 100K with Michelin and BFG's on my 98 4x4 2500.

 

[sag2]

OK, I tried to change the thresholds on a 2014 3500 today. It is in the body controller and although it appears you can change it by selecting the pressure in a drop down, when you try and save the change it does not allow it. So I still have to assume it is a new or impending law that keeps it from being changed any longer.

 

[MelvinPierce]

OK, I tried to change the thresholds on a 2014 3500 today. It is in the body controller and although it appears you can change it by selecting the pressure in a drop down, when you try and save the change it does not allow it. So I still have to assume it is a new or impending law that keeps it from being changed any longer.

What are you trying to change? All the 3500's do is tell you what pressure is in the tires. There is no "setting" for the pressure, like the 2500's have. I have changed the pressure in my 3500's tires, and the pressure changes on the display, no chime, no light, etc.

 

[SBreaux]

I can say on a 2014 2500 that 65 pounds in the rear will not turn the light on or warnings. However at 60 pounds it will turn on the warning light and prompt you in the dash on the EVIC. 55 pounds in the front also no problem. I have had it as low as 54 without warnings in the front. However I do keep the front at 60 since this is what is on the door. However I wish I could lower the rear to stop the warnings. 80 is really rough...

 

[Road Dog]

I know what the door panel says and is 60# front 80# rear this seem high if not carring a load any comments thanks
2014 2500 Crew Cab SRW first CTD and love it as long as I can keep it from going into the dealers shop all the time
first time in only had ONE day 25miles come on

My '02 came with a "Tire Inflation Pressures" notice which had light-load/full-load pressures for all the different truck/tire combinations. The number on the door panel is to meet the GVRW (full load). Back in '02 a 3/4T Diesel QC was 65f/80r full and 55f/40r empty.

There must be a 2014 version of the notice around.

 

[sag2]

What are you trying to change? All the 3500's do is tell you what pressure is in the tires. There is no "setting" for the pressure, like the 2500's have. I have changed the pressure in my 3500's tires, and the pressure changes on the display, no chime, no light, etc.

I was using the wi-Tech dealer scan tool, not the truck display.

 

[Kirwin]

Is the 3500 SRW like the 2500 system? I'd think that the TPIS would be for duallys, not the SRW trucks. Ken Irwin

 

[AlFischer]

Well, my 2014 2500 came with 18" Firestones and because of the EXCESSIVE tire pressure in the rear the ride is unacceptable. Almost reminds me of my 2001!

So I pulled the Load and Inflation Tables from Firestone. Had the truck weighed unloaded 4940 front 3320 rear. Figure that normally it will carry two passengers and not much load. So I add 1000 lbs more (250 per tire. At that load figure 2720 front and 1910 rear. (per tire) Round up to the nearest value on chart then front set for 2940 is 55 psi and rear set for 2070 is 35 lbs. This is calculated per the Firestone supplied data. Dealer says he can set it for whatever I want. (actually I want it GONE!!) I have a pressure gauge and enough sense and responsibility to use it!

Anyone know how to disconnect the whole thing?

 

[Cummins12V98]

Al good call weighing and using the guide. I would bump the fronts 5-10 psi because of the wear that occurs when turning.

 

[sag2]

I do not think your dealer can change it, I tried a couple of weeks ago and it is there like you can, but it will not let you. And your dealer is also not too bright, because he is most likely breaking a federal law. He as well as you will get sued if there is ever a problem with a tire failure and an accident. This is nanny state at it's best.

 

[Jim W]

Well, my 2014 2500 came with 18" Firestones and because of the EXCESSIVE tire pressure in the rear the ride is unacceptable. Almost reminds me of my 2001!

So I pulled the Load and Inflation Tables from Firestone. Had the truck weighed unloaded 4940 front 3320 rear. Figure that normally it will carry two passengers and not much load. So I add 1000 lbs more (250 per tire. At that load figure 2720 front and 1910 rear. (per tire) Round up to the nearest value on chart then front set for 2940 is 55 psi and rear set for 2070 is 35 lbs. This is calculated per the Firestone supplied data. Dealer says he can set it for whatever I want. (actually I want it GONE!!) I have a pressure gauge and enough sense and responsibility to use it!

Anyone know how to disconnect the whole thing?

Not according to BIG BROTHER!!! That is why they have mandated the TPMS on trucks and cars.

Jim W.

 

[AlFischer]

Well, I understand the 'nanny' thing all too well! Many years ago my Mama told me I was too old to need a babysitter! I am sick and tired of this county's attitude on personal responsibility and personal freedoms. And, it's getting worse. Now they are talking about vehicle to vehicle communications and they don't mean a CB!

Any idea how I could 'accidently' disable it? I am a pretty decent mechanic and an electronics and computer specialist.

 

[AlFischer]

Found what appears to be the complete regulation on this subject. http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?reg=571.138
Good reading if you have a degree in law (or are a Federal Government Bureaucrat)

Look to me a an E rated tire must trigger the TPMS warning if the pressure falls to 35 lbs.

 

[AlFischer]

Received the "Service Manual' so I look at the TPMS section. Interesting. Says all 2500 models have a 'Light Load Switch'. Mine doesn't.

22 - Tires and Wheels / Tire Pressure Monitoring / Operation

OPERATION

The Tire Pressure Monitoring (TPM) system monitors air pressure in the four road tires, or if the vehicle original equipment includes a full size matching spare, then all five tires. Pressure in the spare tire is not monitored with a compact spare or a "non-matching spare.

LIGHT LOAD SWITCH On the 2500 series base and premium systems there is a “Light Load” switch located on the instrument panel in the center stack. If equipped, these vehicles will have two different recommended tire pressure values depending on the vehicle load/switch setting. The Light Load switch which will allow the driver to change between two different recommended “Placard Pressure”, “Low-pressure Threshold” and Hysteresis Pressure Values”. These values are stored in the modules non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required. To determine the pressure thresholds for a vehicle, refer to the Tire Inflation Pressure (Placard) Label or Supplemental Tire Pressure Information Label, and then apply the placard pressure to the following table. The Low Pressure OFF Threshold is defined as the Low Pressure ON Threshold plus the Hysteresis Pressure Value.

 

[jus2shy]

I've always wondered why the 2500's are so different. I wonder if it's a technicality for vehicles with GVWR's under 10,000 lbs versus over 10,000 lbs. I'm running 55/45 f/r on my truck right now and never had the TPMS light illuminate except for initial start-up (lamp test). These pressures sure did make a world of difference for me.

 

[AlFischer]

I just set mine at 55/45 and will try it tomorrow. Where I live ANYTHING is a rough ride. The last 1/2 mile to my house you drive less than 10mph or suffer.

I guess I may have to deal with the annoyance of the thin blinking when first started but I am going to let the dealer try to change it.

The difference on to 3500 is the regulation. Look at the link to the reg that I posted yesterday (IF you can make sense out of it!!)