VOLVO
ECM-601C - Turbocharger (TC) control system, boost pressure fault. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (14)
- Volvo S60 (2001–2009)2005–2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2008–2009Engine B5204T5, B5244T5, B5254T2 only
- Volvo S80 (1999–2006)2005–2006Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2006–2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2008Engine B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2005All engines except: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2007Engine B5254T2 only
- Volvo XC90 (2003–)2005–2006Engine B5254T2, B6294T only
- Volvo XC90 (2003–)2007–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
The engine control module (ECM) compares the measured boost pressure with a calculated target value. If the boost pressure becomes higher than the target, a fault is registered. The cause lies in the turbocharger control valve, the hoses, or the pressure servo and wastegate valve that control boost.
Possible causes
- Damaged turbocharger control valve
- One hose from the wastegate valve servo to the turbo control valve has worked loose, or is clogged or cracked
- Hoses between the turbocharger control valve and the charge air pipe are blocked or damaged
- Incorrectly adjusted wastegate valve pressure servo
- Damaged wastegate valve pressure servo
- Sticking wastegate valve
What you can do
- 1Check that the hoses between the wastegate valve pressure servo and the turbocharger control valve are not pinched, blocked or damaged
- 2Check that the hoses between the turbocharger control valve and the charge air pipe are not pinched, blocked or damaged
- 3With a diagnostic tool: activate the turbocharger control valve and listen for a click
- 4Check that the wastegate valve moves freely and is not sticking. Adjusting the pressure servo is a job for a workshop
- 5If none of the above finds the cause, have a workshop check the pressure servo and the boost control
Symptoms you may notice1
- Poor performance
What the fault can affect1
- The throttle opening can be reduced
General guidance for car owners. Diagnosis on the car can point to a different cause.