VOLVO
ECM-943B - Accelerator pedal (AP) position sensor, analog 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 (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
Although the code is titled signal missing, it is set by a message from the CEM that the ECM gets over CAN. The message concerns the analog accelerator pedal sensor signal or a CAN communication fault.
Possible causes
- The cause is sought in the central electronic module (CEM)
What you can do
- 1Start with the CEM fault codes, deal with them, and only then clear this code
- 2If you have a diagnostic tool: check that the accelerator pedal value changes in live data when the pedal is moved, with the engine running
- 3If no fault is found in the CEM, have a workshop with diagnostic equipment fault-trace the CAN communication
- 4The accelerator pedal may be out of action when the brake is pressed. Do not drive with a fault in throttle response, and have a workshop check it at once
Symptoms you may notice2
- Cruise control does not function at all
- Poor accelerator pedal response
What the fault can affect1
- The accelerator pedal is out of action when the brake is pressed
General guidance for car owners. Diagnosis on the car can point to a different cause.