VOLVO
ECM-1934 - Vehicle speed signal. Signal missing
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (6)
- Volvo C30 (2007–2013)2007–2010Engine D4204T only
- Volvo C70 (2006–2013)2008–2010Engine D4204T only
- Volvo S40 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007–2010Engine D4204T only
- Volvo V50 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007–2010Engine D4204T only
What does this fault code mean?
The ECM gets its speed information from the brake control module (BCM) over the CAN network. If the communication is lost or disturbed, the code is set and the engine control module uses the last measured speed. The fault shows as a text message or a warning symbol in the display.
Possible causes
- Faulty CAN communication
- The fault may lie in the brake control module (BCM)
What you can do
- 1Read the fault codes in the brake control module (BCM) and in the central electronics control module (CEM) and fix those first
- 2Clear the fault code in the engine control module once the other faults are fixed, then check whether it returns
- 3Check that the connectors at the brake control module are secure and clean
- 4Drive carefully and have a workshop check the brake system if the fault remains, since the signal comes from the brake control module
Symptoms you may notice1
- Text message or warning symbol in the display
What the fault can affect1
- The engine control module uses the last measured speed signal
General guidance for car owners. Diagnosis on the car can point to a different cause.