Do you know what a serial data communication network is ? All the control modules on your vehicle share info on it . It stead of hard wiring all the componets on the vehicle they use control modules and a data network . U codes are problem codes assoicated with these networks .
U0073 generic control module communication bus"a"OFF Has nothing to do with engine sensors !
Condition
The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The control module does not have contact with the controller area network (CAN).
- Incorrect value runs longer than 10 seconds.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Starting the control module's CAN communication.
Note!The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met. In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent.
Substitute value
Possible source
- Open-circuit in terminals.
- Damaged Parking Assistance Module (PAM).
Fault symptom[s]
- Parking Assistance System, malfunction
- Information lamp is on
- Message in information display
A shorted module will cause the data bus to short and cause no start condition . You best bet , take it to a qualified repair shop .
How to Diagnose Controller Area Network CAN