P38DieselOwner · Monday at 20:17

Hi again everyone, so I have a spare highline BECM, but my car has a lowline BECM and was thinking of just swapping the logic board from lowline to the highline unit but have read on forums it won't work necessarily so I wanted to ask around if anybody had any luck with doing that. Both are taken from manual diesel P38, the highline is from a DSE 1996 and the lowline is from DT 1997.

pwood999 · Monday at 20:28

It would need all the security stuff copying into the Highline. There are places that can do the cloning. Also unless they relicate the mileage (kilometerage ?) then the Instruments or BECM will update to whichever is higher.

If you have the correct FOB(s) & EKA for the Highline, it would probably work, but the milaeage issue still exists. After you write down the new VIN, EKA, etc. you could disable EKA & Immobiliser just in case.

Datatek · Tuesday at 07:17

No point in just swapping the board, if you are going to swap use the whole unit as the relay board on the low line will be different to the high line in that it will lack some components. As pwood999 say's you will need the FOB(s) for the high line, there will likely be a problem with the mileage, the VIN will be incorrect and you will need diagnostics to deal with the EDC immobiliser code.

P38DieselOwner · Tuesday at 08:52

Oh thanks to both of you, I hoped that just putting my working logic board from a lowline into a highline and then putting the highline BECM with my lowline logic board in the car would do the trick, but I won't be doing all that just for front fogs.

Grrrrrr · 2025-08-30T14:22:16+0100

P38DieselOwner said:
Hi again everyone, so I have a spare highline BECM, but my car has a lowline BECM and was thinking of just swapping the logic board from lowline to the highline unit but have read on forums it won't work necessarily so I wanted to ask around if anybody had any luck with doing that. Both are taken from manual diesel P38, the highline is from a DSE 1996 and the lowline is from DT 1997.

Yes, done it. Worked fine.

Grrrrrr · 2025-08-30T14:25:32+0100

P38DieselOwner said:
Oh thanks to both of you, I hoped that just putting my working logic board from a lowline into a highline and then putting the highline BECM with my lowline logic board in the car would do the trick, but I won't be doing all that just for front fogs.

I did that. For some reason the fogs didn't work but I think it was a connector issue because I then put the logic boards back and Marty was kind enough to clone the Highline from my Lowline and we still had sone issues. Cannot remember what it was but Marty spotted it and fixed it. In theory though, plug and play.

Datatek · 2025-08-30T16:59:52+0100

Grrrrrr said:
I did that. For some reason the fogs didn't work but I think it was a connector issue because I then put the logic boards back and Marty was kind enough to clone the Highline from my Lowline and we still had sone issues. Cannot remember what it was but Marty spotted it and fixed it. In theory though, plug and play.

Plug & play? You are joking. Diagnostics needed to sync the BECM to the EDC at the very least plus info relating the vehicle will be incorrect. and you will need the FOB's to go with the replacement BECM.

P38DieselOwner

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pwood999

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Datatek

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P38DieselOwner

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Grrrrrr

Technician, Bodgit & Scarper Ltd

Grrrrrr

Technician, Bodgit & Scarper Ltd

Datatek

Well-Known Member

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