I have a 2008 dodge ram 1500, thed tire pressure warning light came on. The tires are correct pressure, but the light won't go off, when I bought it tires are 20 instead of 17.

when air pressure is correct will reset itself -- if not have a sensor failure Dodge Ram Tire Pressure Indicator Reset Help Dodge Ram Tire Pressure Indicator Reset Help these links show the system but to reset them is you have to have the air correct in them or like i mentioned before these sensors do fail

Some Chrysler ,Jeep and Dodge vehicles have ttye pressure sensors calibrated to the vevicle,so therefore if you change the
tyres to a different type you will need to take your vehicle to a C.J.D.
service department to have the computer of your car re-programmed to accept the new tyres

bad sending unit in one of more of the tires , or needs to be reset, BUT as long as tire pressure is good its fine ,I would never tell someone to do something that would even slightly endanger them . but make a point to have it looked at.
Woody

Willert9

You should not be giving out advice when you clearly have no idea what you are talking about. All dodge Chrysler Jeep products have automatic relearn on the TPMS system. Solid light means low tire pressure flashing light means one or more sensors are not working correctly or you just have installed new sensor on the vehicle and it needs to be relearned. On these make vehicles all you do is drive the vehicle up to 15 mins but usually will go out within 2 minutes

your tires should all be set to the same psi per your sticker on the door-including the spare tire. If one is under inflated, it'll do that.

That is the TPMS (tire pressure monitoring system) warning light. It is letting you know that one or more of the tires is low on tire pressure. The correct tire inflation for the vehicle is located on a sticker inside the drivers front door. Make sure all four tires are inflated to that pressure.

If there all low I would bet you live in a cold weather environment. It is normal for tire pressure to drop as temperatures drop.

If one tire is low than it is probably leaking and should be checked for a repair.

Once the tire pressures have been corrected the vehicle will need to be driven for approximately 10 minutes at sustained speeds of more than 15mph.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

That light indicates you may have a low tire, check your tire pressures to make sure they are all the same and at the recomended pressure then read your owners manual to tell you how to reset the light. Usually the button on your dash to switch the odometer to the different fuctions will have an option for "tire relearn" or "tire reset" push and hold the button when this message appears and your problem should be fixed. (unless you have a leaky tire).

It's a low tire pressure light. It's detected that one of the tires is below the set pressure

Your tire pressure monitor needs to be reset whenever you change or rotate your tires...

1. check and make sure that your tires are inflated to the correct pressure

2. turn the ignition switch to the ON position. If the low tire pressure warning light comes on, push and hold the tire pressure warning reset switch (think the switch is in the glovebox, but not sure) until the warning light turns off and then release the switch.

3. now press and hold the tire pressure warning reset switch until the low tire pressure warning light blinks three times.

4. initialization is *not* completed until driving at the vehicle speed of 19 mph or over for more than one hour. the tire pressure monitoring starts when initialization is completed.

The tire pressure monitor detects any changes in the tire inflation pressure. Therefore, it must initialize and store it in its memory if the tires or wheels have been replaced, re-inflated or the tires have been rotated. You should be able to re-initialize the system by following these steps:

1. check and make sure that your tires are inflated to the correct pressure

2. turn the ignition switch to the ON position. If the low tire pressure warning light comes on, push and hold the tire pressure warning reset switch (think the switch is in the glovebox, but not sure) until the warning light turns off and then release the switch.

3. now press and hold the tire pressure warning reset switch until the low tire pressure warning light blinks three times.

4. initialization is *not* completed until driving at the vehicle speed of 19 mph or over for more than one hour. the tire pressure monitoring starts when initialization is completed.