VOLVO
ECM-C121 - Communication, brake control module (BCM). Signal missing
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Dieser Fehlercode hat je nach Modell, Modelljahr oder Motor unterschiedliche Bedeutungen. Wählen Sie die Bedeutung, die für Ihr Fahrzeug gilt.
Gilt für folgende Modelle:
4 ModelleC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Modelle nach Baujahr und Motor anzeigen (6)
- Volvo C30 (2007–2013)2007–2010Nur Motor: D4204T
- Volvo C70 (2006–2013)2008–2010Nur Motor: D4204T
- Volvo S40 (2004–2013)2004–2006Nur Motor: D4204T, D4204T2
- Volvo S40 (2004–2013)2007–2010Nur Motor: D4204T
- Volvo V50 (2004–2013)2004–2006Nur Motor: D4204T, D4204T2
- Volvo V50 (2004–2013)2007–2010Nur Motor: D4204T
Was bedeutet der Fehlercode?
The engine control module supervises the CAN link to the brake control module (BCM) and stores the fault when that communication is not working. While the fault is present the ABS function does not work, because the brake control module has no link to the engine control module.
Mögliche Ursachen
- Supply voltage to the brake control module (BCM) is missing
- Poor contact, contact resistance or oxidation in the connections
- Open circuit in the high speed CAN wiring to the brake control module
- Internal fault in another control module on the same part of the network
- The brake control module does not belong to this car, for example a used unit with other software or hardware fitted
Was Sie tun können
- 1Start by reading the CEM and brake-module fault codes, and fix the CAN codes first
- 2Check that the fuses for the brake control module are intact and that it has power
- 3Check the connectors at the brake control module for loose contacts and corrosion
- 4Look for chafing and breaks on the CAN wires running to the brake control module
- 5Erase the fault code only once the faults in the CEM and the brake control module are fixed, then road test the car
- 6The brake control module controls ABS. If the brakes or ABS do not work as they should, do not drive the car; have a workshop check it
Symptome, die Sie bemerken können2
- A text message and warning symbol appear in the display
- Warning lamps and warning signals behave abnormally, for example the Check engine lamp
Was der Fehler beeinflussen kann1
- No ABS function
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.