VOLVO
ECM-603C - Turbocharger (TC) control system. 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 (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
The engine control module (ECM) compares the boost pressure it measures with its target value. If the boost pressure becomes higher than the target, a fault is registered, because the turbo control then produces too much boost.
Possible causes
- Incorrectly adjusted pressure servo on the wastegate valve
- Sticking wastegate valve
- Damaged turbocharger control valve
What you can do
- 1With a diagnostic tool: activate the turbocharger control valve. It should click when activated, but a damaged valve can be hard to detect that way
- 2Check that the wastegate valve moves freely and is not sticking
- 3The valve may work only at times, so drive the car and see whether the code returns
- 4Check that the wastegate valve pressure servo works. Adjusting the pressure servo is a job for a workshop
- 5If none of the above finds the cause, have a workshop check the wastegate valve and the pressure servo
Symptoms you may notice1
- Poor performance
What the fault can affect1
- Boost pressure is lower because the boost control valve is held fully open
General guidance for car owners. Diagnosis on the car can point to a different cause.