Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information UEM-00A4

Condition




The upper electronic module (UEM) receives information transmitted by the tire pressure sensors in the wheels, irrespective of the car. The sensors which are registered in the vehicle can be checked by running a statistical selection. A list can then be stored internally in the upper electronic module (UEM). The messages transmitted by the sensors contain information such as the voltage of the internal battery in the sensor.
The diagnostic trouble code (DTC) is stored if the upper electronic module (UEM) receives a message from the first of the four accepted sensors indicating low battery voltage.
The diagnostic trouble code (DTC) can be diagnosed after 10 minutes when the tire pressure warning system is active (vehicle speed is above 40 km/h (25 mph)).

Substitute value
- None.

Possible source
- Low battery voltage in the tire pressure sensor.

Fault symptom[s]
- Message in the display.
- Warning lights and chimes/Tire pressure monitoring indication/no indication