Driving Test Tips

  • Learn to Drive
  • Driving Theory Test
  • Driving Test Tutorials
  • Tips for Passing the Driving Test
  • Driving Schools
  • Car Tips
  • Driving Tips
Home Dashboard Warning Lights Tyre Pressure Light Keeps Coming On

Tyre Pressure Light Keeps Coming On

A ‘direct’ battery powered wireless sensor inside each tyre relays air pressure information typically via radio frequency back to the car’s computer. The tyre pressure dashboard warning light is usually triggered when a pressure loss of around 25% or more is detected.



An ‘indirect’ tyre pressure monitoring system does not have sensors inside the tyres and instead uses ABS wheel speed sensors to detect low tyre pressures.

Even if your car comes equipped with a tyre pressure monitoring system, it’s still important to regularly check pressures as the system will only alert you when the issue becomes hazardous. Maintaining correct tyre pressure is important; underinflated tyres increases tyre wear, increases fuel consumption and if you are running with unequal/incorrect pressures, it will decrease vehicle stability.

From 1st November 2014, EU regulations have made it mandatory for all new-build cars to be fitted with tyre pressure monitoring systems, or ‘TPMS’. This does of course mean that by now, there are many more vehicles on the road equipped with TPMS and as with all things technological, it also means there’s more things to go wrong.

Tyre pressure warning light

Tyre pressure warning light

When the tyre pressure warning light illuminates on your dashboard, you’ll obviously need to check tyre pressures of all four tyres and not forgetting the spare if you have one. If you’re not sure what the pressure should be, check the tyre pressure label, look for information in the car owners manual, or if you’re still no wiser, contact the dealer where you purchased your car for information.

Problems arise when tyre pressures are just fine, but yet that tyre pressure symbol is still illuminated on the dashboard. Let’s look at some of the common faults and remedies.

Tyre Pressure Light Stays On

Assuming tyre pressures have been checked, yet the dash light won’t go off will often suggest a fault with one of the pressure sensors or a faulty / dead battery. Due to the tyre pressure monitoring system being sealed, the entire defective unit will require replacement.


Tyre Pressure Sensor Battery

Direct Tyre Pressure Monitoring System (TPMS)

The ‘direct’ tyre pressure monitoring system (TPMS), unlike ‘indirect’ TPMS attaches a module to each wheel.

The battery is sealed within the TPMS unit and therefore cannot be replaced. Tyre pressure monitor batteries last anywhere up to around 10 years, but realistically you can expect a lifespan of 5 to 6 years. The more miles you do, the quicker the battery will die and in terms of miles, you can expect the battery to last up to 100,000 miles. Battery-free tyre pressure monitor sensors are being developed which will go some way into reducing waste, servicing / replacement costs and weight.

Tyre Pressure Light Coming on in Cold Weather

Inside a tyre, the air pressure will drop in cold weather. If it’s a particularly cold day and your tyre pressure warning has come on, it’s likely that the air pressure has fallen below the TPMS threshold, triggering the warning. Simply add air to your tyres, being careful not to over-inflate.

Tyre Pressure Light Goes On and Off

Again due to external temperatures, this is usually due to colder climate lowering tyre pressures to the TPMS threshold. As you drive, the tyre will warm increasing the pressure and will fall below the threshold when cool again.


Tyre Pressure Light Flashing

A flashing or blinking tyre pressure warning light will usually indicate a fault or the battery in one or more units requires replacement.

Tyre Pressure Warning Light and the MOT

A faulty tyre pressure monitoring system will usually result in an MOT failure. Regulations from 1st January 2015 require that any car manufactured from 2012 onwards that is displaying the TPMS light on the dashboard will fail the MOT test.

Tyre Pressure Warning Light Reset

Before resetting the tyre pressure warning system, ensure pressures are correct else the warning will reappear. TPMS reset is different on all vehicles and it’s likely you’ll need to enter system settings and scroll through a menu to find TPMS options.

How to Monitor Tyre Pressure

If your car doesn’t come equipped with TPMS and you want some means to monitor tyre pressure, an easy and affordable option is tyre pressure monitoring valve caps. These are cheap and simply require swapping over your existing plastic valve caps on your wheels. Depending on the pressure, they will display a colour to indicate tyre pressures are good, need attention or are low.





Driving Test Tips
Comments: 2
  1. Steve
    at

    Hi, I’ve recently had two front tyres put on my Honda Civic ex gt and I travelled all the way to Blackpool from the midlands with no problem, but on the way back the tyre monitoring system warning light came on, so I stopped at a service station and checked my tyres, they all looked ok and didn’t look flat, I’ve put an equal 35psi in them all and the light will not go off, could it be one of the new tyres I had fitted two days previous? Regards Steve.

    ReplyCancel
  2. Driving Test Tips
    at

    Hi Steve,
    Did you reinitialise the tyre pressure monitoring system?
    Using tyres that are not recommended, such as the same brand, model and size can cause issues.

    ReplyCancel

Leave a Reply Cancel reply

CAR MAINTENANCE AND CARE TIPS
  • Best Cars for Young and New Drivers
  • Buying a Used Car Tips
  • Buying a New Car Tips
  • Electric Cars Guide
  • Car Insurance Help
  • Petrol or Diesel Car, Which is best?
  • Automatic or Manual, Which is Best?
  • Car Maintenance Tips
  • Make a Car Safety Emergency Kit
  • How to Service a Car
  • How To Park a Car
  • How to Prevent Car Theft
  • Car Battery Life and Maintenance
  • What is a Catalytic Converter and How they Work
  • Tyre Legal Limit Check
  • What is Engine Coolant / Antifreeze & when to Use It
  • Dashboard Warning Lights
  • How to Push Start a Car
  • Car Lights Law
  • How to Wash a Car
  • Guide to Buying a New Car
  • Defrosting Car Windows Tips
Specific Car Makes and Models
  • Audi Dashboard Warning Lights
  • BMW Dashboard Warning Lights
  • Citroen Dashboard Warning Lights
  • Fiat Dashboard Warning Lights
  • Ford Dashboard Warning Lights
  • Honda Dashboard Warning Lights
  • Kia Dashboard Warning Lights
  • Land Rover Warning Lights
  • Nissan Dashboard Warning Lights
  • Peugeot Dashboard Warning Lights
  • Renault Dashboard Warning Lights
  • ŠKODA Dashboard Warning Lights
  • Vauxhall Dashboard Warning Lights
  • Volkswagen Dashboard Warning Lights
  • Privacy Policy
  • Terms and Conditions
  • International Drivers Tips
  • Driving Instructor Training Advice
  • About Driving Test Tips
  • Contact Driving Test Tips
2021 © Driving Test Tips
This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish.Accept Reject Read More
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled

Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.

Non-necessary

Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.

SAVE & ACCEPT