VOLVO
ECM-0234 - Turbocharger (TC) control. Pressure 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 (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 engine control module compares the actual boost pressure with the value it calculates and logs a fault when they differ. The boost is too high according to the fault code. Causes are leaking or blocked hoses at the turbocharger and the control valve, a damaged vacuum regulator, or a damaged turbocharger control valve.
Possible causes
- Leaking or blocked hoses to the turbocharger or the control valve
- Damaged vacuum regulator
- Damaged turbocharger control valve
What you can do
- 1Read the fault code, clear it and road test to see whether it returns
- 2Check that the hoses to the turbocharger and control valve are correctly fitted and intact, without cracks or blockage
- 3With the engine running, listen for leaking air around the hoses; a hissing sound points to the leak
- 4If you have a diagnostic tool, read boost pressure in live data as the accelerator is pressed and compare it with the value the control module calculates
- 5Have a workshop with a vacuum pump check the vacuum regulator and the function of the turbocharger control valve
- 6If the fault remains, have a workshop decide whether the vacuum regulator or the control valve should be replaced
Symptoms you may notice1
- Check engine light comes on or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.