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Old 02-26-2023, 01:00 PM
Join Date: Feb 2023
Location: Sweden
Posts: 1
djsringup is on a distinguished road
Question 49A6 - LIN bus Communication fault - BMW X5 E70 2012


I have two BMW X5 E70 3.0D LCI 2012 and 2012), both have the same fault code:
49A6 - LIN bus Communication fault

The first car (2011) had problems starting on cold morning, with lots of white smoke…
For this car i bought a new Beru glow plug module and fault was cleared 👍🏻

The second car (2012) has no problem on cold mornings, no white smoke…
On the second car I did the same procedure and fitted a new Beru Glow plug module, but the error won’t clear…(no other error codes on this car at all)
(Maybe it’s a faulty module…but it’s a brand new Beru GS108)

Has anyone had this fault and found any other solution than to replace the glow plug module? What was the problem?

Extra information:
In ISTA-D both the old and the new Glow Plug Module (in car 2012) reads:
Current status of preheating control
Reference field dependent glowing
Power consumption 6553.5W
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Old 02-27-2023, 01:16 AM
ard ard is offline
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 6,724
ard is on a distinguished road
FWIW... sometimes the glow plugs go bad and THAT kills the GP module.

When you replace the module and not the GPs, you *may* find the module failing later...

Replacing them all at once is the best practice.

On the second car if one GP is a dead short, it may be causing the new module to still error...

Just saying
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49a6, bus, communication, lin

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