Was bedeutet der Fehlercode ECM-U04028F?

Diagnose und Fehlercodedefinition für ECM-U04028F (Volvo S60 (2011–), Volvo S60 (2011–), Volvo S80 (2007–)). Steuergerätereparatur bei OBD Tuning.

VOLVO

ECM-U04028F - Invalid Data Received from TCM. Bus Signal / Message Failures. Erratic

System

Motorsteuergerät (ECM)

Volvo-Modelle, für die dieser Fehlercode gilt

Gilt für folgende Modelle:

6 Modelle

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–)

Modelle nach Baujahr und Motor anzeigen (11)

Was bedeutet der Fehlercode?

The TCM keeps asking the engine control module for a set amount of torque. That torque can be adjusted through the air, which is slow, or through ignition timing, which is fast. The code is set when the torque signal from the TCM arrives with poor quality. Although the code is titled erratic, it concerns the quality of that torque signal.

Mögliche Ursachen

Fault in the transmission control module (TCM), which should be checked first
Disturbances or breaks on the CAN network

Was Sie tun können

1Fix the codes in the transmission control module first. Troubleshooting is done there
2Check the CAN connectors between the engine control module and the transmission module for contact resistance and oxidation
3Look for disturbances on the CAN network, such as chafed wires or pinched areas. Use a multimeter to check that the wires have no break
4Clear the code only after the root fault is fixed, then road test the car to see whether it returns
5If the code comes back: have a workshop with diagnostic equipment check the transmission control module

Symptome, die Sie bemerken können1

No noticeable symptoms for the driver

Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.