That little warning on your dashboard that says “Tire Pressure Sensor Fault” can feel alarming, especially if you are not sure what it means or whether it is safe to keep driving. The good news is that it does not always mean something is seriously wrong with your tires. The bad news is that you should not ignore it.
This article explains exactly what the message means, what causes it, and what you need to do to fix it, whether that is something you can handle yourself in a few minutes or something that needs a trip to a mechanic.
What Does “Tire Pressure Sensor Fault” Actually Mean?
When your car displays a “Tire Pressure Sensor Fault” message, it means your vehicle’s Tire Pressure Monitoring System, or TPMS, has detected a problem with one or more of its sensors. The system cannot reliably read your tire pressure right now.
Here is an important distinction: this message does not necessarily mean your tires are currently flat or underinflated. It means the system that watches your tire pressure is having trouble doing its job. Think of it like a smoke detector with a dead battery. Your house might be fine, but the device that would warn you if something went wrong is not working.
That matters because the whole point of TPMS is to alert you before a tire problem becomes dangerous. If the system is down, you lose that early warning. That is why you want to address this promptly, even if your tires feel and look normal.
Is it Safe to Drive With a Tire Pressure Sensor Fault?
You can drive short distances to a safe location or a mechanic, but you should not just keep driving indefinitely and ignore the warning. Without a functioning TPMS, your car cannot alert you to a tire losing pressure, which can lead to a blowout at highway speeds. Tire blowouts are a leading cause of serious accidents, particularly on interstates and highways.
If your tires are currently properly inflated and you have no other symptoms like pulling to one side, vibration, or a sluggish ride, you are likely okay to drive carefully to get the issue diagnosed. But do not put it off for days or weeks.
Common Causes of a Tire Pressure Sensor Fault
There are several reasons this fault message can appear. Some are simple to fix yourself. Others require a mechanic.
1. Dead or Dying Sensor Battery
TPMS sensors run on small batteries that typically last five to ten years. When the battery runs low, the sensor loses the ability to communicate with your car’s computer and triggers the fault warning. Unfortunately, the battery is sealed inside the sensor, so when it dies, the entire sensor usually needs to be replaced. This is one of the most common causes of the fault message, especially in vehicles that are six or more years old.
2. Incorrect Tire Pressure
Sometimes the fault message is triggered simply because one or more tires are significantly over or underinflated. The sensor may be reading a value that falls outside its expected operating range and flagging it as an error. Before assuming the sensor itself is broken, grab a tire pressure gauge and check all four tires, including the spare. Compare the readings to the recommended PSI listed on the sticker inside your driver’s door or in your owner’s manual.
3. Sensor Damage From a Tire Change or Road Debris
The sensors are mounted inside the wheel near the valve stem. Any time someone removes and remounts a tire, there is a chance the sensor could be bumped, cracked, or improperly reinstalled. Road debris like nails or sharp rocks can also cause physical damage. If you recently had a flat tire repaired, new tires installed, or a wheel replaced, that is likely where the problem started.
4. Corrosion
Over time, especially in areas where roads are salted in winter, the sensor’s metal components can corrode. Moisture and road chemicals eat away at the sensor housing and connections, interfering with its ability to take accurate readings or transmit data. Regular inspection of valve stems during tire rotations can catch this early.
5. Extreme Temperatures
Both very hot and very cold temperatures affect tire pressure naturally. Tires typically lose about one PSI for every ten degrees Fahrenheit the temperature drops. In winter, this can cause the TPMS light to come on even if nothing is actually wrong with the sensor. If the weather has recently changed significantly and no other symptoms are present, try inflating your tires to the correct pressure and see if the fault clears.
6. Wiring or Module Issues
Less commonly, the problem is not with the sensors themselves but with the wiring that connects them to the TPMS receiver or the receiver module itself. Damaged wiring can disrupt communication and cause fault codes to appear. This type of issue typically requires a diagnostic scan at a shop to identify.
How to Fix a Tire Pressure Sensor Fault: Step by Step
Here is how to work through this problem in order, from the simplest fix to the more involved ones.
Step 1: Manually Check All Your Tires
Start here before anything else. Use a tire pressure gauge and check every tire, including the spare. You are looking for the recommended PSI listed on your driver’s door jamb or in your owner’s manual, not the maximum PSI printed on the tire sidewall. Those are two different numbers.
If any tire is low, inflate it to the correct pressure. If a tire is significantly overinflated, release some air until it reaches the right level.
Step 2: Reset the TPMS System
After correcting tire pressure, the system may need a manual reset to clear the fault message. Here is the general process, though the exact steps vary by vehicle:
Turn the ignition to the “On” position without starting the engine. Find the TPMS reset button, which is usually located under or near the steering wheel. Press and hold it until the TPMS light blinks three times, then release. Start the car and drive for a few minutes at normal speed to allow the system to recalibrate.
Always check your owner’s manual for the specific reset procedure for your vehicle’s make and model, as the steps can differ.
Step 3: Drive to Recalibrate
Some vehicles use indirect TPMS systems that rely on wheel speed sensors rather than individual pressure sensors. These systems recalibrate automatically after you drive at around 50 mph for 15 to 30 minutes. After correcting pressure and resetting the system, take a normal drive and see if the warning clears on its own.
Step 4: Inspect the Sensors and Valve Stems
If the warning persists, take a close look at the valve stems on each wheel. Look for visible cracks, damage, or corrosion. If you recently had any tire work done, mention it to the mechanic, as that is the most likely source of the problem.
Step 5: Get a TPMS Diagnostic Scan
If none of the above steps clear the fault, the next move is a professional diagnostic scan. A mechanic or tire shop with a TPMS-capable scan tool can communicate directly with each sensor to identify which one is failing, whether the problem is a dead battery, a communication error, or a damaged sensor. This scan is usually inexpensive and gives you a clear answer before spending money on parts.
Step 6: Replace the Faulty Sensor
Once the problem sensor is identified, replacement is straightforward for any experienced tire shop. Sensors typically cost between $50 and $150 per sensor, including labor. If your vehicle is older and multiple sensors are approaching the end of their battery life, it may make sense to replace all four at once to avoid returning for the same issue a few months later.
Can You Replace a TPMS Sensor Yourself?
Technically, yes. Replacement sensors are available at auto parts stores and online. However, replacing them correctly requires removing the tire from the wheel, which takes specialized equipment. It also requires programming the new sensor to communicate with your vehicle’s TPMS receiver, which needs a scan tool. Unless you have access to that equipment and are comfortable with the process, this is a job best left to a tire shop.
Preventing Future TPMS Faults
A few habits can significantly reduce the chance of dealing with this warning again.
Check your tire pressure manually at least once a month and before any long road trip. Do not rely solely on the TPMS to tell you when something is wrong. Use a quality pressure gauge and compare your readings to the manufacturer’s recommendation, which can change based on vehicle load and seasonal temperature shifts.
When getting new tires installed, ask the shop to inspect the TPMS sensors at the same time. Sensors that are close to the end of their battery life can be replaced proactively during a tire change, which saves you from paying twice for labor.
Keep up with scheduled tire rotations. Most tire shops inspect sensors during rotations and can flag early signs of corrosion or damage before they cause a failure.
If your vehicle is older than seven or eight years and you have never had TPMS sensors replaced, plan for it. At that age, you are within the normal window for battery failure across all four sensors.
When a Tire Blowout Causes an Accident
A malfunctioning TPMS that fails to alert a driver to low tire pressure is one of the contributing factors behind tire blowout accidents on Georgia roads. When a tire loses pressure rapidly at highway speeds, the driver can lose control in an instant. Those crashes often result in serious injuries or fatalities.
If you or someone you love was injured in an accident caused by a tire failure, a defective TPMS, or a vehicle safety system that did not work as intended, you may have grounds for a product liability or personal injury claim. At Wetherington Law Firm, we have recovered more than $500 million for injury victims across Georgia, and we offer free consultations with no fee unless we win your case.
Frequently Asked Questions
Why does my tire pressure sensor fault light keep coming back after I reset it?
If the fault returns shortly after resetting, the underlying cause has not been fixed. Most likely, one or more sensors have a dead or dying battery, physical damage, or a communication error. A TPMS scan at a tire shop will tell you exactly which sensor is failing and why.
Can cold weather trigger a tire pressure sensor fault?
Yes. Cold temperatures cause the air inside your tires to contract, which drops pressure. A significant temperature drop can lower your tire pressure enough to trigger a fault warning even if there is nothing wrong with the sensor itself. Check and adjust your tire pressure whenever the temperature changes by more than 10 to 15 degrees.
How much does it cost to fix a tire pressure sensor fault?
The cost depends on the cause. If incorrect tire pressure is the issue, it costs nothing but the time to check and adjust. If one or more sensors need replacement, expect to pay between $50 and $150 per sensor including labor. A full set of four sensors typically runs $200 to $500 at most shops.
Does a TPMS replace regular tire pressure checks?
No. The TPMS is a backup warning system, not a substitute for routine maintenance. By the time the TPMS triggers a low-pressure alert, your tire pressure has already dropped significantly. Checking your tires manually every month gives you a more complete picture of their condition.
Can I pass a vehicle inspection with a tire pressure sensor fault?
In most states, including Georgia, a vehicle with a TPMS malfunction will fail a safety inspection. The TPMS is a federally mandated safety system on all vehicles sold in the United States after September 2007, and inspectors check whether it is functioning properly.
What is the difference between the TPMS warning light and a tire pressure sensor fault message?
The TPMS warning light (the horseshoe-shaped icon with an exclamation point) typically means one or more tires are low on pressure. A “Tire Pressure Sensor Fault” message specifically means the monitoring system itself is not working correctly, regardless of whether your tires are properly inflated.