communication code

[janwil]

DPF Sensor , I keep getting a UO20D communication code appear bringing on the red engine warning on start up which does off after a few seconds with the eml staying on, It has been deleted on three occasions & when deleted all is ok for a few weeks but appears again after a while . tried plugging a obd2 in today & managed again to delete with success . Is Bank 1 relating to the sensor, urea quantity is ok.













7

[GiveMeABreak]

That's not coming up as a valid code for this vehicle. It needs reading with a Lexia / Diagbox.

However a 'U' code generally indicates a communication issue on the network / ECU. It's no good deleting the code, there is an underlying issue that needs investigation or the code will just keep reappearing.

[janwil]

Sorry I should have said UO29D

[GiveMeABreak]

There are a few possibilities (incidentally the 'O' in the code is a numeric '0' for future reference) :

Check 1
Check the power supply to the urea gauge-pump module, the urea reservoir and the NOx sensor:
If there are anomalies: Repair the electrical supply.
If there are no anomalies: Carry out check 2

Check 2
Check the earth of the urea reservoir gauge-pump module and the NOx sensor:
If there are anomalies: Repair the Earth
If there are no anomalies: Carry out check 3

Check 3
Check the continuity and the isolation of the emission control CAN:
If there are anomalies: Repair the electrical harness.

If there are no detected issues after making the checks, then don't carry out any of the repairs.