BMW TPM Malfunction TPMS Inactive

BMW tire pressure monitoring system (TPMS, TPM, FTM) is designed to alert the driver when tire pressure is too low. The tire pressure warning light illuminates when air pressure is 20% below the recommended pressure. Make sure the tires are inflated to the correct pressure to reset the TPMS light.

DIY Cost: $50-$350
Est. Time: 30 min - 2 hr
Difficulty: Easy

BMW TPM TPMS Light Warning Due to Low Tire PressureWhen a BMW detects a flat tire, the TPM or TPMS light (yellow tire symbol with exclamation mark), and a warning message display on the Drive Display, an audible sound warns the driver of low tire pressure.

If the TPM or TPMS light flashes, it means there is a malfunction with the tire monitoring system. 

BMW TPM warning light on

A BMW Tire Pressure Monitoring System detects a 20% loss in tire pressure, and it triggers a TPM warning to alert the driver. On a BMW, this system may also be called Flat Tire Monitor or FTM.

BMW TPM TPMS Warning Light

If the tire pressure is correct, you may be getting a TPM malfunction or inactive errors because:

  • TPMS sensor is defective
  • RDC module is faulty
  • External interference

What to do?

BMW tpm pressure

If you are getting a tire pressure warning message, the first thing you need to do is pull over and ensure you do not have a flat tire. If pressure loss is minimal, visit the nearest gas station and use the air compressor to add air to your tires. 

bmw recommened tire pressure

Inflate all the tires to the recommended air pressure. You can find the recommended tire pressure on the tire pressure label that can be found on the driver's door frame or behind the gas cap. The typical BMW tire pressure is 32-36 PSI. Low-profile tires may require up to 45 PSI.

Reset BMW TPM warning

The next step is to reset the TPM warning.

  1. Inflate the tires to the recommended tire pressure. Typically 36 PSI.
  2. Press the iDrive knob to select vehicle settings.
  3. Scroll down to Vehicle Tires using the iDrive knob.
  4. Rotate the iDrive knob to select the TPM menu.
  5. Select Reset, then press the iDrive knob.
  6. Select YES. The status should change to Resetting TPM.
  7. After a short drive, the Status should change to TPM Active.

Because of various transportation acts, a TPM system is mandatory for all new cars sold in the United States after September 2007. So, all BMW cars from 2008 have a TPM system installed from the factory, regardless of the model and equipment level.

How does BMW TPM work?

Reset BMW TPMS

The TPM has pressure sensors in each wheel, and a control unit ( also known as RDC, TPM, TPMS receiver) is installed in the vehicle.

This system monitors tire pressure and warns the driver if the pressure is too low. Proper tire pressure (typically 32-36 psi) will ensure the best performance, fuel economy, and extended tire life.

Common Problems

If the TPM, TPMS, or FTM light are flashing on a BMW, the tire monitoring system has been disabled due to one of the following problems: 

Defective RDC Transmitter

With generation 1 or generation 2 TPM systems, older BMW models have a sensor within the tire and a transmitter in each wheel well, hidden behind the underliner.

Transmitters pick up the signal from sensors and send them to the central control unit. In most cases, a transmitter can go bad, causing a break in communication.

It is also possible for a reception antenna in the control unit to fail.

Water Damage

Newer BMW models, equipped with generation 3 or later TPM systems, use a more simplified system. With no wheel transmitters, wheel sensors combined with a single control unit with an integrated antenna are the only components.

Depending on the model year, the control unit is mounted on the chassis, which exposes the elements. As a result, moisture enters the casing, causing corrosion on sensitive electronic components.

Although sealed, the control unit can be opened with a bit of effort. Clean any traces of corrosion, which are green in most cases.

BMW tire pressure module (A85a) may be installed under the spare tire or the dashboard on the driver's side.

A common problem with the BMW tire pressure system is when the RDC module is installed under the spare tire on the trunk floor.

Water can build up under the spare tire, which damages the module or causes corrosion to the contacts.

TPM Fuse

blown tpm fuse

Lastly, check the TPM fuse, as it can burn if the control unit shorts out.

In most models, this fuse is located in the junction box behind the glove compartment.

TPM Sensor Battery

BMW TPM sensor

Within each tire, there is a sensor that gives information about the air pressure.

They have a lithium-ion battery, which drains out with time. In most cases, OEM batteries can last up to 10 years.

Another possibility is mechanical damage, which can happen during tire fitment.

Most tire shops have wireless readers that can verify if the sensor is emitting the signal.

Possible Error Messages

  • Tire Pressure Monitor TPM for the detection of flat tires is currently unavailable. Don't hesitate to get in touch with the nearest BMW.
  • TPM Status: TPM Malfunction
  • Tire Pressure Monitor (TPM) malfunction:
    • System unable to detect tire pressure loss
    • Check tire pressure manually.
    • Continued driving is possible.
    • Consult service center
  • Tire Pressure Monitoring malfunction: Drive moderately. The system is unable to detect tire pressure loss. Consult service center.
  • TPM Inactive warning light on the dashboard.
  • Tire pressure monitor reset: System inactive and unable to detect pressure loss for up to 12 minutes. Reset only occurs while driving.
  • Low tire pressure. Stop carefully. For Run Flat tires with the "RSC" symbol, you can continue driving with max. 50 mph (80 km/h).

Diagnose BMW TPM System

To diagnose a BMW tire system malfunction, you will need an OBD-II scanner to read and clear BMW-specific fault codes.

Generic OBD-II scanners won't be able to read BMW TPM fault codes such as:

  • 604E RDC System Malfunction
  • 6050 RDC Transmitter, front right
  • 6055 Wheel electronics, front right

TPMS and Run-Flat Tires

Most new BMW cars have run-flat tires; an inoperable TPM system can be a safety issue.

Depending on the type, cars with run-flat tires can drive up to 55 mph and 200 miles with underinflated tires.

While conventional tires have soft sidewalls that deflate when unpressurized, a run-flat tire has a strong sidewall structure.

However, as these tires can support the car's weight and maintain their shape with no air inside, drivers might not notice a punctured tire.

Visitor, January 15, 2020
Hi there, I have a BMW 420 convertible (65 plate). I recently had the common problem of water sloshing around in the panels due to blocked drains. However, the car has also come up with RDC failure which is what prompted me to research the water sloshing sound. BMW have cleared and modified the drains but are saying that the RDC failure has nothing to do with the water ingress. Where is the RDC module and antennae located on these models and is it possible that water ingress in the boot, particularly in the rear right where there are a number of electrics can cause the problem?
Bob Marino, January 26, 2021

2007 328xi coupe tpm malfunction. Where is the RDC located