Fiat 500 tyre pressure warning light: how to reset it

On almost every Fiat 500 sold in the UK you clear the tyre pressure warning by setting all four tyres to the correct cold pressure and then running a reset in the instrument panel menu, because the car has no pressure sensors in the wheels to read. On the petrol and mild hybrid 500 the menu item is called RESET TYRES and sits in the setup menu. On the electric 500e it lives in the Main Menu under "Vehicle info" as "Reset tyre pressure". Early 500s have nothing to reset because they were built before the system was fitted, and a 500 imported from North America works in a completely different way again.

Every instruction below is taken from a Fiat owner's manual, and the edition is named each time so you can check it against your own car. Fiat publishes its handbooks through the eLUM owner handbook library, where your registration or VIN brings up the edition that matches your 500. If the menus on your car do not look like the ones described here, follow your own handbook rather than a video made for a different model year.

iTPMS on the 500, 500C and 500e, and the cars without it

This is the part most guides skip, and it is the reason so many Fiat 500 owners follow instructions that do nothing. The 500 has used three different arrangements depending on when and where it was built.

The word to look for is iTPMS, which Fiat spells out in the Series 10 (MY22) Fiat 500 owner's manual as the "indirect Tyre Pressure Monitoring System", a system that "monitors the tyre inflation status thanks to wheel speed sensors" (Fiat 500 Series 10, MY22, owner's manual). Nothing inside the tyre is measuring anything. The car compares how fast each wheel is turning, and because a tyre that loses air gets slightly smaller in diameter it has to spin a little faster to keep up. That difference is the warning.

Two consequences follow from that, and they explain most of the confusion around this light. First, the car has no idea what the correct pressure is until you tell it, which is what the reset does. Second, it cannot show you a pressure reading in psi or bar for each corner, so if your 500 displays four numbers on screen you are looking at a different Fiat, most likely a 500X. Our explainer on what the TPMS warning light means covers how the two designs differ.

The cut off date is not arbitrary. TyreSafe records that since November 2014 all new passenger vehicles sold in the EU have had to be fitted with a tyre pressure monitoring system, which is why a 2013 Fiat 500 typically has nothing in its handbook about the subject while a 2016 car has a whole chapter. Fiat's own English owner handbook for the 500 dated March 2014 contains no tyre pressure monitoring section at all (Fiat 500 owner handbook, March 2014 English edition).

Before you reset: getting the pressures right

A reset does not fix a soft tyre. It tells the 500 that whatever the tyres are set to right now is normal, so resetting with one tyre down teaches the car to ignore the very fault you are trying to clear. Do this first, every time.

• Check them cold. The Series 10 manual is explicit: "Tyre pressure must be checked with tyres cold. Should it become necessary for whatever reason to check pressure with warm tyres, do not reduce pressure even though it is higher than the prescribed value, but repeat the check when tyres are cold." A gauge reading taken after a drive will flatter you.
• Use the figures for your car, not a generic number. The correct pressures are in the inflation pressure table in the Wheels part of the technical specifications section of your handbook, and they change with tyre size and with how heavily the car is loaded. The 500 has been sold on 14, 15 and 16 inch wheels and the figures are not the same for all of them.
• Do all four. Fiat's warning note says that if the system signals a pressure drop on one tyre, "it is recommended to check the pressure on all four tyres".
• Include the space saver if you carry one. The maintenance chapter says to check the pressure of each tyre, including the space saver spare wheel, roughly every two weeks and before long journeys, with the tyre rested and cold.

We have deliberately not printed pressure figures here. They vary by wheel size and load, and the label and handbook table on your own 500 are the only ones that count. The related guides below cover the background.

How to reset the tyre pressure light on a petrol or mild hybrid Fiat 500

This covers the 500 and 500C with the 1.2 petrol, the TwinAir and the 1.0 mild hybrid, in other words the cars with the round instrument pod and the small screen in the middle of it. The Fiat 500 Series 10 (MY22) owner's manual describes the menu item as "Reset tyres (iTPMS reset)" and lists it in the setup menu as RESET TYRES.

1. Correct all four cold pressures first, as above.
2. Park up. Fiat's safety chapter says to carry out the reset "with the car stopped and the ignition key at MAR", which is the normal ignition on position without the engine running.
3. Press the MENU button briefly to open the setup menu. The MENU button and the + and the minus buttons sit beside the instrument panel.
4. Use + or minus to scroll down the setup list to RESET TYRES. The list runs through items such as DIMMER, SPEED BEEP, SET TIME, SET DATE, UNITS, LANGUAGE, SERVICE and DAYTIME RUNNING LIGHTS before it reaches RESET TYRES.
5. Press MENU briefly. The display shows "Reset".
6. Press + or minus to select "Yes" or "No", then press MENU briefly. The display shows "Confirm".
7. Press + or minus to choose "Yes" to reset, then confirm. A message tells you the selection has been stored.

Two extra things the handbook mentions that are worth knowing. You can see the system's own screen by pressing the TRIP button, and on cars with the colour display it shows the tyre pressure status, with "KO" appearing beside a tyre that the car believes is flat. And if the 500 has been standing for a long time, Fiat says to make sure the pressures are correct and reset the iTPMS from the menu before using it again.

The light will not necessarily go out the moment you confirm. Read the next part but one before you decide the reset has failed.

How to reset the tyre pressure warning on a Fiat 500e

The electric 500e, the round headlamp 332 series launched in 2020, is a different car from the petrol 500 in almost every way, but it still uses an indirect system. Fiat's 500e owner handbook and the Series 2 (MY23) manual both describe the iTPMS as monitoring "the tyre inflation status thanks to wheel speed sensors". The difference is where the reset lives and how you confirm it.

1. Set all four tyres cold to the pressures in the inflation pressure table in your handbook.
2. With the car stopped and the ignition device at ENGINE, open the Main Menu.
3. Go to "Vehicle info" and then to "Reset tyre pressure".
4. Press and hold the OK button for more than two seconds.
5. Watch the graphic progress bar on the display until the reset finishes.

When it works, the 500e shows the message "Reset saved" and sounds an acoustic warning. That message is the confirmation to look for. Fiat's handbook adds a detail that catches people out: "If the self-learning procedure of the iTPMS system has not been carried out correctly, no warning is provided." In plain terms, no "Reset saved" message means the reset did not take, so do it again rather than assuming it worked.

Fiat's North American owner's manual for the current 500e uses exactly the same wording, and the English editions we checked were the 500e owner handbook, March 2021 edition and the 500e Series 2, MY23, manual. The North American 2024 500e manual gives the speed figure in miles as well, which is useful here: the learning phase wants a straight road at about 50 mph for at least 20 minutes.

Early 500s and North American imports: why the menu is missing

Two groups of Fiat 500 owners find that none of the above applies, and both are worth naming because the wrong advice sends people hunting through menus that do not exist.

Early 500s. If your 500 was registered before the tyre pressure monitoring requirement came in, there is very likely nothing fitted and nothing to reset. Fiat's own English owner handbook for the 500 dated March 2014 has no tyre pressure monitoring chapter, no iTPMS warning light and no reset item in its menu list. If a warning lamp on a car of that age is worrying you, it is something else, and the warning lights pages of your handbook will name it.

North American imports. A Fiat 500 built for the United States or Canada between 2012 and 2019 does not use the indirect system at all. Its owner's manual describes a Tire Pressure Monitoring System that "uses wireless technology with wheel rim mounted electronic sensors to monitor tire pressure levels", with "Four Tire Pressure Monitoring Sensors" mounted to each wheel as part of the valve stem. There is no menu reset on those cars. The light goes out on its own once the tyres are back at the correct cold pressure and the sensors have reported in. If a sensor itself has failed, or a wheel has been fitted without one, it needs a replacement sensor programmed to the car, which is what our guide to TPMS sensor replacement covers.

This is also why so much of the advice online does not work here. A large share of Fiat 500 videos and forum posts are American, written about a car with sensors, and the steps simply do not map onto a UK car that has none. Note too that the 500L and the 500X are separate models with their own handbooks, so a 500X procedure will not match a 500.

The light comes back straight away: what that means

There are four honest explanations. Work through them in order.

It has not finished learning yet

Fiat says the iTPMS "needs an initial self-learning phase" whose length depends on driving style and road conditions, and describes the optimal conditions as "driving on a straight road at 80 km/h for at least 20 minutes". That is around 50 mph. It also notes the system is only active above 15 km/h, about 9 mph. So a reset followed by a week of short trips round town may genuinely not have settled yet. A steady run on a dual carriageway is the fastest way to finish the job.

The light is flashing, not steady

The difference matters. Fiat's warning light table says a steady light means the pressure is lower than recommended. A light that "flashes for about 75 seconds and then stays on constantly", along with a message on the display, means the system is temporarily deactivated or faulty. That is not a tyre message, and no amount of pumping and resetting will clear it. If it does not sort itself out once conditions are normal again, the handbook says to carry out the reset, and if the warning persists to have the car looked at.

Something is confusing the wheel speed comparison

Because the system works by comparing wheels, anything that makes one corner roll differently upsets it. Fiat lists the situations by name: the car loaded heavily on one side, a damaged or worn tyre, the space saver spare fitted, snow chains fitted, or different tyres on the front and rear axles. The 500e handbook adds towing a trailer and use of the Fix and Go tyre repair kit. That last one matters on a 500, because many of them carry a sealant kit instead of a spare wheel, and a tyre that has had sealant through it can keep the system unhappy. Mismatched tyres matter too: if one corner has been replaced with a different make, pattern or size, expect trouble.

Air is still escaping

If the light clears properly and then comes back days later, the tyre is losing air. A nail or screw in the tread, a perished or corroded valve, or a poor seal where the tyre meets the rim will all do it, and the 500's small wheels make kerb damage to the rim edge more likely than most. Our guide to tyre valve problems explains how to find a leaking valve. Do not keep topping the tyre up and resetting the light. You are resetting the alarm, not fixing the leak.

What Fiat's handbook says about driving on with the light lit

Not for long. Fiat's instruction with the low pressure warning is blunt: "Do not continue driving with one or more flat tyres as handling may be compromised. Stop the vehicle, avoiding sharp braking and steering." The handbook also warns that the iTPMS "cannot indicate sudden tyre pressure drops (for example when a tyre bursts)", so the light being off is not proof that a tyre is sound.

• Stop straight away if the steering pulls, you hear a flapping or rumbling noise, or the tyre is visibly down. Driving on a deflated tyre wrecks the sidewall quickly and turns a repairable puncture into a new tyre.
• Treat a flashing light as a blind spot. While the system is faulty the 500 cannot warn you about a genuine pressure loss, so check all four with a gauge until it is fixed.

The general motorway safety and MOT points for this warning apply to every car, and our TPMS warning light explainer, linked above, covers them.

Cold weather matters, because air contracts as the temperature falls and the pressure drops with it. That is why the light so often appears on the first frosty morning.

Help with a 500 whose light will not stay off

If the warning keeps returning, one tyre keeps going down or the 75-second flash will not clear, Rescue Tyres can help. We work from one base at Brent Cross, London NW2, mainly across London and the nearby Home Counties, 7 days a week when the diary allows. Our fitter comes to the car where it is safely parked, checks all four pressures against the figures for your 500, inspects the tread, sidewalls and valves, and carries out puncture repairs to BS AU 159 where the damage falls in the repairable area. If the tyre cannot be saved we source the right size for your car, including the 14, 15 and 16 inch fitments the 500 has used, and fit and balance it on the spot. If the fault turns out to be the monitoring system rather than the tyre, you will be told that plainly instead of being sold rubber you do not need.

The price is confirmed on the call before any work starts, and the arrival time is given on the call. Phone or WhatsApp 07473 720871. There is more on how it works on our mobile tyre fitting page.