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Ford Focus MK2.5 STV GEM module suspect

VXXT
VXXT
in Ford Focus Club

Featured Replies

Hi, ive got a MK2.5 focus that does the engine malfunction, reduced speed and no buttons work on drivers door, nor central lock for that door.
ive resoldered speedo, checked all fuses, measured ohm on canbus and measured for shorts. also put in a fresh battery.

My question is:
ive got another focus mk2.5 thats perfectly fine. would i create any problems for that focus if i "borrowed" the GEM for testing in the broken one?

  • Quote


    You would need to upload the AsBuilt data to the replacement GEM

  • Quote
    • Author
    3 minutes ago, unofix said:

    You would need to upload the AsBuilt data to the replacement GEM

    even for troubleshooting purposes? will it throw codes or engine malfunction without writing to it?
    i dont want to end up with two broken focuses!

  • Quote

    Just for troubleshooting you could give it a try without changing the AsBuilt data if the two cars are very similar but the PATS security might prevent it from starting

  • Quote
    • Author
    2 minutes ago, unofix said:

    Just for troubleshooting you could give it a try without changing the AsBuilt data if the two cars are very similar but the PATS security might prevent it from starting

    i was under the impression that only ECU and cluster stored PATS data?
    ill do a backup of both gems and reflash the known working one then, and if everything goes wrong, ill have my backup files! 🙂

  • Quote

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    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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