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4th Gen Ram Tech2009+ and up Rams: This section is for TECHNICAL discussions only, that involve the 2009 and up Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
OK I have a '12 Express with the nearly useless DIC display but this morning my low tire pressure warning came on. I stopped for gas and checked my pressures. Got 35PSI on 3 tires and 30PSI on the 4th sure I added air so all 4 now have 35PSI which is what my door jam stickers says they should be at.
The warning light is still on? Does it go out when the pressure is corrected or do I have to somehow reset it?
Might it be a bad sensor? Not sure how low the pressure has to drop to set off a warning.
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2012 RAM1500 Express 4x4
Hemi, Auto, Std cab just 200 miles as of July 1st :-)
Mods: Just ordered some stuff !
The Tire Pressure Monitor System (TPMS) will warn the driver of a low tire pressure based on the vehicle recommended cold placard pressure.
The tire pressure will vary with temperature by about 1 psi (6.9 kPa) for every 12°F (6.5°C). This means that when the outside temperature decreases, the tire pressure will decrease. Tire pressure should always be set based on cold inflation tire pressure. This is defined as the tire pressure after the vehicle has not been driven for at least three hours, or driven less than 1 mile (1.6 km) after a three hour period. The cold tire inflation pressure must not exceed the maximum inflation pressure molded into the tire sidewall. Refer to “Tires – General Information” in “Starting and Operating” for information on how to properly inflate the vehicle’s tires. The tire pressure will also increase as the vehicle is driven - this is normal and there should be no adjustment for this increased pressure.
The TPMS will warn the driver of a low tire pressure if the tire pressure falls below the low-pressure warning limit for any reason, including low temperature effects and natural pressure loss through the tire.
The TPMS will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off until the tire pressure is at or above the recommended cold placard pressure. Once the low tire pressure warning (Tire Pressure Monitoring [TPM] Telltale Light) illuminates, you must increase the tire pressure to the recommended cold placard pressure in order for the TPM Telltale Light to turn off. The system will automatically update and the TPM Telltale Light will turn off once the system receives the updated tire pressures. The vehicle may need to be driven for up to 20 minutes above 15 mph (24 km/h) in order for the TPMS to receive this information.
Drive around for a while and it should reset on its own. The spare isn't part of the system until it's being used (the sensors activate during motion). If it still doesn't reset, and there's 35psi in each, then you may have a faulty sensor....but I wouldn't expect that to be the case.
It did go out today after driving to work. Looks like that was the key. When I filled the low tire with air I was only 1/2 mile from home so it never had the chanse to reset.
Thanks again (read the manual, doh)
I recently had to use my spare due to a nail in my right rear tire. It did not register on the tire monitor. It continued to read that tire as "0". Only after having the tire repaired and put back on did the tire monitor reset.