BCM-0020

Condition





The Brake Control Module (BCM) receives information about wheel speed from the wheel sensors. The wheel sensors, which are on the wheel mounting, read off a pulse wheel on the wheel spindle. Diagnostic Trouble Code (DTC) BCM-0010, BCM-0020, BCM-0030 or BCM-0040 is stored, depending on the wheel sensor, if the control module registers that the signal from any of the wheel sensors is distorted or missing too many times.
- BCM-0010: Wheel sensor, left front
- BCM-0020: Wheel sensor, right front
- BCM-0030: Wheel sensor, left rear
- BCM-0040: Wheel sensor, right rear.
The Diagnostic Trouble Code (DTC)) can be diagnosed at speeds above 10 km/h.

Substitute value
- The ABS is blocked
- Electronic Brake force Distribution is blocked if two or more wheel sensors are not working
- Traction control is blocked
- Stability control is blocked
- Active yaw control is blocked
- Brake assistance is blocked.

Hint: For information about brake system abbreviations, see Brake system abbreviations.

Possible source
- Contact resistance in the terminals
- Open-circuit, short-circuit to ground or supply voltage in the power supply to the wheel sensor
- The signal cables are short-circuited to each other
- Short-circuit to supply voltage or ground in the signal cable
- Open-circuit in the signal cable
- Defective wheel sensor
- Internal fault in the control module.

Fault symptom[s]
- General warning lamp lit
- The ABS warning lamp is lit
- The anti-spin warning lamp is lit (up to and including 2002 model year)
- The warning lamp for brake circuit not functioning is lit
- The ABS system does not function
- Anti-spin does not function
- The stability control system does not function
- The traction control system does not function.

Note: If the fault is intermittent the ABS warning lamp will not go out until the vehicle speed exceeds 10 km/h in the next operating cycle.