Steps to Reset Mercedes GLB Tire Pressure Light
Fill the tires to the recommended air pressures.
Press the START/ENGINE/STOP button twice, without your foot on the brake.
Press the BACK or ENTER button on the left side of the steering wheel to exit the prompt “Depress Brake to Start Engine”
Press the HOME button on the left side of the steering wheel.
Use the ENTER/SCROLL button to scroll all the way to the right to SERVICE.
Select SERVICE using the ENTER/SCROLL button.
Scroll down and select TIRES.
Use the scroll button and SCROLL down when prompted with “Tire pressure will be displayed after driving a few minutes”
Select OK when prompted “Use Current Pressures as New Reference Values”.
If successful a message will appear “Tire Press. Monitor Restarted”.3
What is the Mercedes GLB TPMS?
The Mercedes GLB TPMS is the vehicle’s tire pressure monitoring system. The TPMS measures the air pressure in all four tires. The Mercedes GLB tire pressure monitoring system uses four tire pressure sensors , a special receiver called the TPMS receiver module and the GLB’s on board computer called the ECU or ECM.
HOW DOES THE MERCEDES GLB TPMS WORK?
Mercedes GLB Tire Pressure Sensors: Each Mercedes GLB tire pressure sensor consists of a small chip, a battery and a radio transmitter that all live inside a small plastic case. Attached to the plastic case is the valve stem. The battery powers the chip which exists to measure the current air pressure in the tire and the radio transmitter uses radio waves to send the air pressure information to the Mercedes GLB TPMS receiver module.
Mercedes GLB TPMS Receiver Module: The TPMS receiver module receives all tire air pressure information from each tire and then forwards it to the Mercedes GLB’s main computer.
Mercedes GLB ECU: The Mercedes GLB on board computer analyzes all the tire data and compares it against air pressure thresholds Mercedes has created for the GLB. If the ECU recognizes a tire’s air pressure is at 27 PSI when it should be at 36 PSI, it alerts the driver with a Low Tire Pressure alert on the information display.
WHAT TO DO IF YOUR MERCEDES TIRE LIGHT ACTIVATES
As soon as your Mercedes GLB low tire pressure alert turns on, pull over in a safe area and check your tire pressures with a tire pressure gauge (a digital one is preferable). Look over each tire and make sure there are no visible issues.
REASONS YOUR MERCEDES LOW TIRE PRESSURE WARNING LIGHT TURNS ON
Incorrect tire pressure (too high or too low)
Using the spare tire
Weak or failing batteries in TPMS sensors
Issues with the TPMS receiver or engine control module (ECM/ECU), including software glitches
Interference from electromagnetic fields caused by nearby vehicles or electronic devices
Drastic changes in air temperature
Overloading the vehicle beyond its maximum capacity or towing limit
Installing tire chains
Very dark window tinting on the vehicle
Variations in road surface temperature
Using tires that are the wrong size or not matching Mercedes GLB OEM
Damage to TPMS sensors during tire changes
Not resetting or recalibrating the TPMS after inflating or servicing tires
WHY YOU SHOULD ONLY ADJUST MERCEDES GLB TIRE PRESSURE WHEN TIRES ARE COLD
The Mercedes GLB tire pressure recommendations are for tires in a “cold state”. This means if the Mercedes GLB’s recommended tire pressure is 41 PSI, the air pressure should be adjusted to 41 PSI when the tires are cold. Cold tires are officially cold before driving the vehicle or after waiting 3 or more hours after last driving. Adjusting your tire’s air pressure when the tires are not cold will likely cause overinflation.
AVOIDING TIRE OVERINFLATION
If your Mercedes GLB tires are warm, either because they’ve been recently driven on or it’s hot outside, their air pressure readings will be higher than they really are. If you adjust the air pressure then, you will likely end up putting too much air in them resulting in overinflation.
CAN A CHANGE IN ALTITUDE TRIGGER THE TPMS WARNING LIGHT?
The Mercedes GLB tire pressure light won’t turn on just because you’re driving to a higher altitude. When you go up in elevation, the air pressure inside your tires actually goes up. The tire pressure increases by about 0.5 Psi for every 1,000 feet you climb.
MERCEDES GLB TIRE PRESSURE SENSOR BATTERIES
The Mercedes GLB tire pressure sensors each have their own non-replaceable and non-rechargeable silver oxide batteries. Each tire pressure sensor battery can last anywhere from 5-15 years or about 150,000 miles. When a Mercedes GLB tire pressure sensor battery runs out of juice, the entire sensor has to be replaced with a new one.
IS IT SAFE TO DRIVE THE MERCEDES GLB WITH THE TIRE LIGHT ON?
Driving your Mercedes GLB with low tire pressure is not safe. If you have a tire leaking air, have the tire repaired or replaced as soon as possible. If a tire pressure sensor battery has died and this is why the low tire pressure alert is on, driving is perfectly safe as long as the tires still have the correct air pressure.
HOW FAR CAN THE MERCEDES GLB BE DRIVEN WITH THE TIRE LIGHT ON?
If your Mercedes GLB low tire pressure alert turns on, there is no set distance, time, or standard that you can safely continue driving. It’s important to stop as soon as possible, visually check all tires, and use a digital air pressure gauge to measure the air pressure in each tire. Don’t solely depend on the air pressure readings from the Mercedes GLB information display.
MERCEDES GLB TIRE PRESSURE SENSORS WITH NEW WHEELS OR TIRES
If you replace the wheels or rims on your Mercedes GLB you have two options:
Swap the OEM Mercedes-Benz tire pressure sensors from the original wheels to the new wheels.
Purchase programmable tire pressure sensors, install them on the new wheels, and program them to the Mercedes GLB ECU.
When replacing the Mercedes GLB tires with new tires, follow the standard Mercedes GLB low tire pressure light reset procedure.
WHY IS THE MERCEDES LOW TIRE LIGHT FLASHING?
If your Mercedes GLB low tire pressure light is flashing it means one or more tire pressure sensors are no longer able to communicate with the vehicle’s on board computer. This can occur for one of 3 reasons:
The spare tire is mounted on the Mercedes GLB.
A tire pressure sensor’s battery has died or is low on power.
A tire pressure sensor has been broken or damaged and is no longer communicating with the vehicle.
CAN THE MERCEDES GLB TPMS BE DISABLED?
The Mercedes GLB tire pressure monitoring system cannot be disabled. If you remove the tire pressure sensors from the tires and replace them with non-sensored valve stems, the tire pressure light will flash and then remain on. This is known as a TPMS malfunction.
USING A TPMS PROGRAMMING TOOL TO DIAGNOSE THE TIRE PRESSURE SENSORS
Tire pressure diagnostic tools are great for testing and diagnosing tire pressure sensors. They can scan and evaluate each sensor, providing a report that shows the status of the sensor’s battery, its signal strength, the tire’s temperature, the MHz frequency of the sensor, and the position of each sensor on the vehicle. Mercedes TPMS Sensors showing issues like a weak battery or poor signal must be replaced.
CAN WEATHER CHANGES TRIGGER THE LOW TIRE PRESSURE LIGHT?
One of the most common causes the Mercedes GLB low tire alert will turn on is due to a change in weather. Tire pressure usually changes by about 1 Psi for every 10°F change in air temperature. For example, if it gets 50°F colder over the course of a month, the air pressure in your Mercedes GLB’s tires might drop from 41 Psi to 36 Psi, causing the low tire warning light to turn on. Changes in air temperature are inevitable (depending on where you live) so we recommend checking your air pressure at least once every few weeks and only when the tires are cold to avoid issues.
WHY IS THE MERCEDES GLB TIRE LIGHT ON IF THE TIRES LOOK FINE?
Never evaluate tires based on how they look. Always manually check the air pressure of your Mercedes GLB tires with a digital tire pressure gauge if you think something is wrong. If the low tire pressure light turns off when you add air, this means the Mercedes TPMS is working correctly.
FINDING A TIRE LEAK WITH SOAP AND WATER
To find out exactly where a tire is leaking, do the following:
Pump up the leaking tire to 40 Psi.
Mix water and liquid soap in a spray bottle.
Generously spray the soapy water all over the tire, paying extra attention to the bead and valve stem.
Watch for bubbles and follow them back to where they’re coming from to find the leak.
DISCONNECTING THE BATTERY TO RESET MERCEDES GLB'S ON BOARD COMPUTER
If resetting and calibrating the tire pressure system in your Mercedes GLB doesn’t turn off the low tire pressure warning, you can try disconnecting the car’s main 12-volt battery to clear any temporary TPMS codes in the car’s ECU. Follow these steps:
Make sure the engine and all electronics (like the radio and lights) are off.
Loosen the negative terminal clamp and take it off the battery.
Wait a bit before you put the terminal back and re-tighten it.
These steps should switch off the low tire pressure light. But, if the tire light comes back on while driving, it’s likely due to a bad tire pressure sensor or a tire that’s losing air.
IMPACT OF UNDERINFLATED TIRES ON FUEL CONSUMPTION
Maintaining the correct tire pressure in the Mercedes GLB is crucial for fuel efficiency. Underinflated tires increase rolling resistance which means the engine has to work harder to move the car, leading to higher fuel consumption. For every 1 Psi drop in pressure of all tires, fuel efficiency can decrease by 0.2%. So, if the tires are underinflated by 5 Psi, which is not uncommon, the vehicle could experience a 1% decrease in miles per gallon (MPG). In practical terms, for a car like the Mercedes GLB that averages between 22-27 MPG, a 1% decrease means using more fuel – approximately an extra gallon for every 2,500 miles driven.
ARE TIRE PLUGS SAFE?
I have been working as an automotive technician for the past 10 years and use tire plugs to repair tire punctures regularly. I believe they are safe and effective if used correctly. Do not use tire plugs if the tire tread is very worn or on a tires sidewall. If the puncture or leak is large, use a tire patch or replace the tire.
DO TIRE SEALANTS DAMAGE TIRE SENSORS?
Yes, tire sealants can damage tire pressure sensors. If you use a tire sealant to temporarily repair a tire, ask your local repair shop to clean out the tire and test the tire pressure sensors to make sure they are still working properly.
Everything in this article is applicable to all Mercedes GLB models and versions built between 2019-2024 including the Mercedes GLB 180, GLB 200, GLB 250, GLB 200 AMG, and GLB 35 4Matic.
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