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Discussion Starter · #1 ·
Hey guys, new member here.
I have been working on my 2007 S40 T5 AWD and it has a "Anti-skid Service Required" message on the dash. I scanned it and got two codes: BCM-0094 (BCM-0094 - Volvo Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis) and CEM-DE1A (CEM-DE1A - Volvo Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis). I thought servicing the DEM (Haldex gen 2) would fix the issue but it has persisted after changing the pump, fluid, filter, etc.

From what the codes suggest it could be any of the following:
  • Voltage supply to the Differential electronic module (DEM) is missing.
  • Open circuit in ground lead for the Differential electronic module (DEM).
  • Contact resistance in the terminals.
  • Open circuit in the wiring for the CAN low-speed network to the Differential Electronic Module (DEM)
  • Differential Electronic Module (DEM) is not intended for this car, e. g. , used control module with other hardware/software.
  • Faulty DEM
The DEM looks perfectly fine internally and externally with no obvious faults or damage and as I mentioned before the pump, filter, fluid, etc. were all replaced. There are no obvious wiring faults that we noticed when dropping the rear subframe to access and service the Haldex unit. I am mostly asking to see if anyone has had issues like this and to share their solution. Thanks in advance, this forum has been exceedingly helpful so far!
 

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Discussion Starter · #4 ·
Just noticed you're in Australia, so the CEM and yaw sensor may be on the drivers' side. Not entirely sure.
Will do, I hate working with electronics but I found no obvious faults (like signs of a leaky sunroof/exposed wiring and such). I'm taking it to a Volvo specialist mechanic on monday. I'll update the thread when I know what they found.
 
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