Parking brake
Check the pressure switch for the high pressure and the pressure switch circuit for short circuits and open circuits. Note: The vehicle must be driven at a speed of more than 30 km/h so that the fault code will cease to be active.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The signal from one of the pressure switches for the parking brake circuit has been implausible in relation to the vehicle speed. The parking brake circuit has one pressure switch which monitors a high air pressure, and one which monitors a low air pressure. This fault applies to the higher pressure.
The pressure switch has indicated that the air pressure in the parking brake circuit has been below a certain value, and has thereby sent a grounding signal to the coordinator. The signal is interpreted as the parking brake being applied, while at the same time the vehicle speed has been above 30 km/h. The fault may be due to: The pressure switch circuit may have been shorted to ground. Faulty pressure switch for high air pressure.