What is the highest tire pressure psi to avoid getting a tire pressure high warning?

[Scotty8154]

The vehicle tag says to inflate the front tires to 43psi and the rear tires to 49psi. I inflated the tires to 38 front and 43 rear and got a "tire pressure high" warning. I took some air out of the tires and am now down to 35 psi on all tires and am still getting the "tire pressure high" warning for some of the tires. Seems quite low for these tires. I use the vehicle exclusively on paved roads. What is the highest tire pressure I can have without causing the "tire pressure high" warning?

Bridgestone Dueler 255/70R18 tires (50 psi max)

 

[terdrocket]

Reset the RCP

 

[Jeremy996]

Reset the RCP

What he said - the tire (tyre) pressures considered normal by the system are a moveable feast depending on the last reset. Unless you are fully loaded, you probably want about 38psi all round for normal use for drivability.

 

[rob88]

The vehicle tag says to inflate the front tires to 43psi and the rear tires to 49psi. I inflated the tires to 38 front and 43 rear and got a "tire pressure high" warning. I took some air out of the tires and am now down to 35 psi on all tires and am still getting the "tire pressure high" warning for some of the tires. Seems quite low for these tires. I use the vehicle exclusively on paved roads. What is the highest tire pressure I can have without causing the "tire pressure high" warning?

Bridgestone Dueler 255/70R18 tires (50 psi max)

You need to reset the TPMS system after you change the pressures. The warning is for the change, not the absolute pressure.
Drive for a few minutes above 15 mph after you've set your final pressures. The system should then relearn and the warnings will clear.
Your chosen pressures are fine for road use. The system just needs to be told that those are the new normal.

 

[Leonidas]

Please forgive my ignorance
What means "reset the RCP"

 

[ADVAW8S]

Please forgive my ignorance
What means "reset the RCP"

Reset
Cold
Pressure

Found in the off-road section of the infotainment system.

 

[Scotty8154]

Thanks all. I reset the RCP (when tires were "cold") after setting the desired tire pressure (38 psi) and I no longer get the tire pressure warning.

RCP Reset Procedure for INEOS Grenadier​

Accessing the RCP Menu​

1. Navigate to the Offroad Menu: Start by accessing the offroad menu on your vehicle's display.
2. Locate the Temperature Screen: Find the temperature screen within the offroad menu.
3. Select the Top Corner: Tap the top three lines in the corner of the screen. This should prompt the option to set the RCP (Recommended Cold Pressure).

 

[Korg]

They need to get rid of RCP entirely and add a quick reset option along with an upper and lower warning setting that we can set and fix it properly as has been stated over and over previously: It is too sensitive, too restrictive in tire pressure ranges (can't set pressure to over 49 PSI, can't properly disable the alarm (when stopped and the warning selected on the infotainment pressing OK on the sterring wheel appears to stop the warning flashing up repeatedly) .. or was it press and hold on the push button on the indicator stalk...tire rotation is another issue for those that rotate tires.

 

[Clark Kent]

They need to get rid of RCP entirely and add a quick reset option along with an upper and lower warning setting that we can set and fix it properly as has been stated over and over previously: It is too sensitive, too restrictive in tire pressure ranges (can't set pressure to over 49 PSI, can't properly disable the alarm (when stopped and the warning selected on the infotainment pressing OK on the sterring wheel appears to stop the warning flashing up repeatedly) .. or was it press and hold on the push button on the indicator stalk...tire rotation is another issue for those that rotate tires.

I don't think alerts for increasing (climbing) pressure are necessary. Increasing temperature maybe but not pressure. Set the starting cold pressure and a low pressure alert threshold and be done with it.
Tyre pressure and temperature is expected to rise during operation. Putting an upper limit on it with a narrow operating band is unhelpful. Like others, I have had a high pressure alert within 30 minutes of setting off and cannot clear it until the next day when the tyres are cold. It makes the TPMS less useful with an amber alert displayed on the telltale panel all day.

 

[Korg]

I don't think alerts for increasing (climbing) pressure are necessary. Increasing temperature maybe but not pressure. Set the starting cold pressure and a low pressure alert threshold and be done with it.
Tyre pressure and temperature is expected to rise during operation. Putting an upper limit on it with a narrow operating band is unhelpful. Like others, I have had a high pressure alert within 30 minutes of setting off and cannot clear it until the next day when the tyres are cold. It makes the TPMS less useful with an amber alert displayed on the telltale panel all day.

Maybe.
From my last trip which was across the Simpson in late August we had 3c overnight and 28c during the day. It was impossible to set the tire pressures at around 18PSI as was needed. When over at Alice Springs and doing highway speeds with a heavy 3.93t loaded Grenadier (4t GVM upgrade) tires needed to be 50psi but the stupid system was too hot for RCP. It needs to be simplified, IMO it should warn of a deviation of say 10 PSI from what it was set to and allow an easy fast reset. We can then air up or down as needed and simply press reset. If tires get hot/cold and exceed variance let us know with an option to reset it. Not allowing us to reset because of the termperature is just plain stupid. Perhaps add an upper and lower limit adjustable - 10PSI to 50PSI for tire protection as an example as this range is needed for extreme off road.

 

[Tazzieman]

Just set the appropriate pressure for the conditions and ignore the warning light. Check from time to time that the tyre temps are equal. And an infrared thermometer if you like to worry about bearings.
What on earth did we do before TPMSs?

 

[Korg]

Just set the appropriate pressure for the conditions and ignore the warning light. Check from time to time that the tyre temps are equal. And an infrared thermometer if you like to worry about bearings.
What on earth did we do before TPMSs?

The issue for me is that the dues to RCP logic I can't reset it so have to put up with the annoying warnings for hours on end.