What does fault code ECM-U030041 mean?

Diagnostic fault code details for ECM-U030041 (Volvo S80 (2007–), Volvo S80 (2007–), Volvo V70 (2008–)). Repair service at OBD Tuning.

VOLVO

ECM-U030041 - Internal Control Module Software Incompatibility. System Internal Failures. General checksum failure

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

5 models

S80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)

Show models by year and engine (8)

What does this fault code mean?

The engine control module (ECM) checks its configuration ID against the signal configuration broadcast by the central electronics control module (CEM) on CAN. Although the code is titled general checksum failure, it concerns a configuration ID that differs from the one the CEM sends.

Possible causes

Wrong configuration ID because the module is not intended for the car, for example a used module with different software or hardware
Break in the CAN wires between the module and the CEM

What you can do

1Check that the module is intended for this specific car, especially if it is used or has recently been replaced
2Check the CAN wires between the module and the central electronics control module for chafing and loose contacts
3Use a multimeter to check that the CAN wires have no break or short to ground or supply voltage
4Have a workshop with diagnostic equipment check the configuration and reprogram the module if needed

Symptoms you may notice2

The cruise control does not engage
Red warning symbol and text message in the display

What the fault can affect2

The module shuts off from the CAN network (bus-off)
The module still responds to diagnostic commands

General guidance for car owners. Diagnosis on the car can point to a different cause.