What does fault code ECM-911B mean?

Diagnostic fault code details for ECM-911B (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C70 (2006–2013)). Repair service at OBD Tuning.

VOLVO

ECM-911B - Clutch pedal sensor. Signal missing

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

4 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Show models by year and engine (9)

What does this fault code mean?

Although the code is named signal missing, it can also mean that the clutch pedal sensor reports a wrong value, or that CAN communication is faulty. The engine control module (ECM) gets an error report from the central electronic module (CEM) via CAN and stores the code. There is no separate troubleshooting, and the code cannot be erased until the fault in the CEM is remedied.

Possible causes

The signal from the clutch pedal sensor is missing or faulty, according to the central electronic module (CEM)
Fault in the communication on the CAN network

What you can do

1First read off the fault codes in the central electronic module (CEM) and remedy the cause there, as this code cannot be erased before then
2Once the fault in the CEM is remedied and erased, you can erase this code too
3Check the connector at the clutch pedal sensor and the wiring to it for loose contacts, oxidation and chafed areas
4If you have a diagnostic tool: follow the clutch pedal position in live data and check that the value changes smoothly when the pedal is pressed and released

Symptoms you may notice1

The cruise control does not work at all

What the fault can affect1

The cruise control is switched off

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