P1240

The CAN bus is malfunctioning.

Test 1: Check the CAN communication with control unit Engine control module.

Test 2: Possible cause:

- Drive train CAN bus
Affected functions:

- Engine diagnosis
- Fuel system

1. Check the CAN communication with control unit Engine control module.
Important note
A CAN timeout fault code is set due to the absence of a CAN input signal.The cause of this may be not only the transmitter control unit, but also the CAN networking.Possible cause and remedy

- Check CAN communication with affected control unit.
- Check other control units for vehicle CAN bus failure in the stored faults.
- CAN bus has loose contact or Open circuit.
Continue with button F 2

Warning!Communication with ECU required.


2. No further information available.