VOLVO
BCM-U011400 - Failed communication with differential electronic module (DEM). General malfunction information. No information on malfunction type
System
Brake Control Module (BCM)
Volvo models this fault code applies to
Applies to the following models:
1 modelXC90 (2003–)
What does this fault code mean?
The brake control module (BCM) is not receiving confirmation from the all-wheel drive control module (DEM) that the all-wheel drive is working. The fault applies to cars with all-wheel drive and DSTC. The stability function must not be activated in all-wheel drive, so when the signal is missing the stability systems are switched off. The fault most often lies in the all-wheel drive module or in the data network.
Possible causes
- Fault in the all-wheel drive control module (DEM)
- Interference or intermittent breaks on the CAN network
What you can do
- 1Read codes in the central electronic module first, as this fault often follows other communication faults
- 2Read and troubleshoot codes in the all-wheel drive control module
- 3If the fault is intermittent only, clear the code and check that it does not return
- 4Check that the all-wheel drive module has the latest software; programming is carried out by a workshop according to procedure
- 5The brake system is safety-critical, so have a workshop carry out all work on the network and the modules
Symptoms you may notice4
- General warning lamp on
- Traction control does not work
- Stability function does not work
- Anti-skid function does not work
What the fault can affect3
- Stability control is disabled
- Traction control is disabled, including all-wheel drive traction control, without any warning lamp coming on
- Dynamic stability control (AYC) is disabled
General guidance for car owners. Diagnosis on the car can point to a different cause.