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Old 11-02-2020, 01:00 AM
Join Date: Nov 2020
Location: Brisbane, Australia
Posts: 1
yassa is on a distinguished road
E70 BMW X5M NO DME Communication - TCU/ECU Failure?

G’day I recently purchased a E70 2011/12 BMW X5M 4.4L TT,

The engine was just pulled and rebuild by a reputable specialist in Brisbane, QLD. After 2 months and over $18K the car was ready, so I thought… 950KMS after collection I experience an issue with the TCM where the car displayed DSC and ESC lights prior to stalling out. The gearbox was still engaged in gear so the ECU inevitaby prohibited me from cranking over. I was unable to engage/disengage the handbrake or put the gearbox into P or N. I scanned the car with a snap-on scanner where I noticed that there was no communication to the DME or TCU. I manually placed the gearbox into N via the bottom of the trans housing and manually released the electronic parking brake - to have the vehicle towed back to the shop.

The diagnostic from the shop was “a short which blew the gear selector fuse”. After a fuse replacement we had communication with the TCU and all transmission related computers however, nothing from the ECU/engine electronics.

We have power to the ECU, but the car just won’t fire/crank whatsoever, as if there was no ECU to begin with. Before biting the bullet and sourcing a new ECU I thought I’d try my lucky on the forums. I’d hate to spend thousands on an ECU + coding only to find that the issue was related to a ground/another contributing factor.

There doesn’t seem to be any precedents/similar issues on forums, so here we are. Has anyone experienced anything similar or know anyone who has? I’ve tried to be as comprehensive as possible, however may have missed some bits and bobs. Any help is greatly appreciated!

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