Diagnostic Trouble Code Information BCM-U040482

Condition 

Fig 1: Identifying Brake Control Module (BCM) & Engine Control Module (ECM)

Courtesy of VOLVO CARS CORPORATION

The brake control module (BCM) receives a signal from the central electronic module (CEM) (manual transmission) or from the transmission control module (TCM) (automatic transmission) with information on the engaged gear. If reverse (R) is engaged, it should not be possible to activate the stability function.

Diagnostic trouble code BCM-U040482 is generated in the following cases:

• If the brake control module (BCM) registers no signal or a disrupted signal.
• If the brake control module (BCM) receives a signal indicating that reverse gear is engaged while the vehicle is being driven forward for more than one second.

The diagnostic trouble code can be diagnosed when speed exceeds 40 km/h (25 mph) and the direction of travel is straight ahead followed by a turn.

Substitute Value 

• Nothing.

Possible Source 

• Open circuit or short-circuit in the circuit for the back-up light switch (manual transmission).
• Interference on the CAN network.
• Short circuit or open circuit on CAN cable.

Fault symptom[s] 

• None.