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Mark
Mark, UK Car Mechanic
Category: UK Car
Satisfied Customers: 1504
Experience:  Over 30 yrs trade experience
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Ford Focus: Iv got a problem with my 2007 focus 1.8 tdci.

Customer Question

I'v got a problem with my 2007 focus 1.8 tdci. The car was stood for a while and the battery had gone flat. I tested the old battery and found it to be bad, so replaced with a new one.

The problem now is that the car won't turn over. The immobiliser light stay on solid and eventually flashes up code 23. So what i would like to know is what exactly code 23 means? (i'v read a couple of different meanings on the internet) And also what would be the best thing to do next?
Submitted: 3 years ago.
Category: UK Car
Expert:  Mark replied 3 years ago.

markthebooler :

Hello. My name is Mark and I will be assisting you today.

markthebooler :

Code 23 is a data mismatch between the PCM and the instrument cluster.

markthebooler :

All you can do is have it reprogrammed providing it isn't faulty.

Customer :

Ok, cheers. Thats what i thought the code ment.

Customer :

I'm pretty sure that something is faulty and it's not just a case of reprogramming. When i first charged the battery there engine would turn over, just very slowly. When i tried charging again the lights on the dash started to flash and thats when the problems started.

Customer :

Is there any way to test the pcm or the intrument cluster?

markthebooler :

Only with a scan tool or manual checks with a multimeter to ensure they have good voltage supplies and earths.

Customer :

Ok, well i think the damage happen when i charged the battery.

Customer :

Do you know how to test using a multimeter? or where i can find the result to expect?

markthebooler :

You need to check the multiplug at the instruments and the pcm with a multimeter.