VOLVO
ECM-140B - Manifold pressure sensor. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (8)
- Volvo C30 (2007–2013)2007–2011Engine B5244S4 only
- Volvo C70 (2006–2013)2006All engines except: B5254T3
- Volvo C70 (2006–2013)2007–2010Engine B5244S4, B5244S5 only
- Volvo C70 (2006–2013)2011Engine B5244S4 only
- Volvo S40 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo S40 (2004–2013)2005–2010Engine B5244S4, B5244S5, B5244S7 only
- Volvo V50 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo V50 (2004–2013)2005–2010Engine B5244S4, B5244S5, B5244S7 only
What does this fault code mean?
The fault concerns the intake manifold pressure sensor. It is set when the sensor circuit is shorted to ground or voltage, or when there is a break in the circuit. Although the code is labelled too low, a signal that is too high can also set it.
Possible causes
- Signal wire shorted to voltage
- Open circuit in the signal wire
- Damaged intake manifold pressure sensor
- Signal wire shorted to ground
What you can do
- 1Read the fault code, clear it and test drive to see whether it returns
- 2If you have a diagnostic tool: with the engine running, a wrong signal now means a permanent fault, a correct one an intermittent fault
- 3Check the wire to the pressure sensor for breaks, chafing and shorts to ground or voltage
- 4Check the pressure sensor connector for contact resistance and oxidation
- 5If the connector and wire are fine: have a workshop check the pressure sensor
Symptoms you may notice2
- Engine warning lamp comes on
- Poor throttle response
What the fault can affect1
- A value from the MAF sensor is used instead of the pressure sensor
General guidance for car owners. Diagnosis on the car can point to a different cause.