VOLVO
ECM-P040937 - Exhaust Gas Recirculation Sensor A Circuit. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency too high
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
5 ModelleS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Modelle nach Baujahr und Motor anzeigen (6)
- Volvo S80 (2007–)2007–2009Nur Motor: D5244T4, D5244T5
- Volvo V70 (2008–)2008–2009Nur Motor: D5244T4, D5244T5
- Volvo XC60 (2009–)2009Alle Motoren außer: B6304T2
- Volvo XC70 (2008–)2008Alle Motoren außer: B6324S
- Volvo XC70 (2008–)2009Nur Motor: D5244T4, D5244T5
- Volvo XC90 (2003–)2013–2014Nur Motor: D5244T18, D5244T5
Was bedeutet der Fehlercode?
The code is named for a signal frequency that is too high. It is set when the PWM signal from the position sensor on EGR valve A is incorrect, and the ECM monitors that signal while the engine runs.
Mögliche Ursachen
- Loose contact or oxidation in the connectors
- Break in the signal cable
- Damaged position sensor
- Damaged EGR valve
- EGR valve sticking from soot or dirt
- Fault codes ECM-P040936 and ECM-P040938 may share the same cause
Was Sie tun können
- 1Check the signal cable for chafing and pinching, since it carries the position sensor signal
- 2Check that the connectors to the position sensor are firm and free from oxidation
- 3If you have a diagnostic tool, read the fault status with the engine running and see whether the fault is active
- 4Check that the EGR valve moves without sticking and clean it of soot if needed
- 5Read and clear the fault code, then road test the car to see whether it comes back
- 6If the fault remains, have a workshop check the position sensor and the EGR valve
Symptome, die Sie bemerken können1
- The Check engine (malfunction indicator) light comes on or behaves abnormally
Was der Fehler beeinflussen kann1
- EGR control is lost
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.