VOLVO
ECM-0238 - Boost pressure sensor (MAP). Signal too high
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 (10)
- Volvo C30 (2007–2013)2007Engine D4204T only
- Volvo C30 (2007–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo C70 (2006–2013)2008Engine D4204T only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo S40 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007Engine D4204T only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V50 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007Engine D4204T only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The control module watches the boost sensor reading and checks it against the atmospheric pressure it measures itself. The fault is logged when the signal is too high, or when boost and atmospheric pressure differ clearly with the ignition on. Causes are poor contact, a break in the signal or supply wire, a short to voltage, or a damaged sensor.
Possible causes
- Contact resistance, oxidation or loose connection in the connections
- Open circuit in the signal wire
- Open circuit in the power supply
- Signal wire shorted to supply voltage
- Damaged boost pressure sensor
What you can do
- 1Read the fault code, clear it and road test to see whether it returns
- 2Check the boost pressure sensor connector: is it fully engaged and free from moisture and oxidation?
- 3Follow the signal and supply wires from the sensor and look for breaks and chafing
- 4With the ignition on and the connector unplugged, use a multimeter to see whether the signal wire picks up voltage. If it does, it is shorted to plus
- 5If the fault returns after a road test, have a workshop decide whether the boost pressure sensor should be replaced
Symptoms you may notice1
- Check engine light comes on or behaves abnormally
What the fault can affect1
- A calculated boost pressure is used instead
General guidance for car owners. Diagnosis on the car can point to a different cause.