Hi, all i have a 1.8 Focus Zetec Climate Tdci i had issues with it there was no power , the heaters wouldnt heat up , all dash lights would come on then the engine would stop , car would start again this has happened quite a number of times in a day sometimes it would be fine , so i called recovery out they plugged a test thing in and some error codes came up ( P1622 , P2135 , UD423 , B2778 ) I am still driving it and for the past 4 days its been fine ( the heaters are giving out heat , there is power , no dash lights are coming on and engine isnt cutting out its been running and driving fine as if there is no faults at all ) is it possible that its fixed itself ? .... hope you understand what ive typed ty for reading any feed back is very much appriciated ...ty James

If the third code in your list is U0423 rather than UD423 it indicates a CAN bus communication fault related to the instrument cluster. There are many threads on this topic in the forum and it's usually caused by cracked solder joints on the cluster main connector, caused by the use of lead-free solder. The age of your vehicle puts it in the range of years that's affected by this problem. You can often confirm it by slapping your hand on the top of the dash above the instruments when the problem occurs.

It won't have fixed itself. Intermittent faults never do, they usually just get more frequent.

The other DTC's are, in all probability, spurious ones associated with the CANbus communiation problem.

My son got his mk2.5 2008 home from Cornwall to Essex by slapping the dash above the speedo many times, a nightmare drive !  Cluster then reconditioned cost £96

15 minutes ago, RL123 said:

from Cornwall to Essex

I can understand the cars reluctance to relocate 🤣

5 hours ago, james_170 said:

Hi, all i have a 1.8 Focus Zetec Climate Tdci i had issues with it there was no power , the heaters wouldnt heat up , all dash lights would come on then the engine would stop , car would start again this has happened quite a number of times in a day sometimes it would be fine , so i called recovery out they plugged a test thing in and some error codes came up ( P1622 , P2135 , UD423 , B2778 ) I am still driving it and for the past 4 days its been fine ( the heaters are giving out heat , there is power , no dash lights are coming on and engine isnt cutting out its been running and driving fine as if there is no faults at all ) is it possible that its fixed itself ? .... hope you understand what ive typed ty for reading any feed back is very much appriciated ...ty James

Start the car and whack the top of the dash above the cluster. If it happens again (while stationary, of course) then it's the cluster. 

If that doesn't do it, and you know what you're doing, unscrew the cluster and remote it from it's slot (leave it plugged in) and repeat the test but this time also physically flex the harness going into it and watch to see if the warning lights come back

ty for all ur input