VOLVO
ECM-602D - Turbocharger (TC) control system, flow fault. Signal too low
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, 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) requests high boost pressure but measures a lower boost pressure than the calculated target value, and registers a fault. The fault is detected when the engine is working at high speed and under heavy load. The cause may be a leak in the intake or a fault in the turbocharger or the valves.
Possible causes
- Air leakage in the intake system
- Damaged turbocharger control valve
- Incorrectly adjusted wastegate valve pressure servo
- Sticking wastegate valve
- Damaged turbocharger unit
What you can do
- 1Check the intake system for air leaks, and that the charge air pipes are firmly attached
- 2Check that the hoses to the turbocharger control valve are intact and not pinched or blocked
- 3With a diagnostic tool: activate the turbocharger control valve and check that it responds
- 4Check that the wastegate valve moves freely. Adjusting the pressure servo is a job for a workshop
- 5If the fault remains after these checks, have a workshop check the turbocharger unit
Symptoms you may notice1
- Poor performance
What the fault can affect1
- Boost pressure is lower than normal
General guidance for car owners. Diagnosis on the car can point to a different cause.