VOLVO
ECM-300A - Camshaft position (CMP) sensor. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
9 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (30)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S60 (2001–2009)2001Engine B5244S, B5244S2, D5244T only
- Volvo S60 (2001–2009)2002All engines except: B5204T5, B5234T3, B5234T7, B5244T3
- Volvo S60 (2001–2009)2003All engines except: B5204T5, B5234T3, B5234T7, B5244T3, B5254T2
- Volvo S60 (2001–2009)2004All engines except: B5204T5, B5234T3, B5234T7, B5254T2, B5254T4
- Volvo S60 (2001–2009)2005Engine B5244SG, B5244SG2, D5244T, D5244T2, D5244T3 only
- Volvo S60 (2001–2009)2006Engine B5244SG, D5244T, D5244T2 only
- Volvo S60 (2001–2009)2007–2008Engine B5244SG only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2000Engine B5244S, B5244S2 only
- Volvo S80 (1999–2006)2001Engine B5244S, B5244S2, B5244SG, D5244T only
- Volvo S80 (1999–2006)2002All engines except: B5204T5, B5234T7, B5244T3, B6294S2, B6294T
- Volvo S80 (1999–2006)2003Engine B5244S, B5244S2, B5244SG, B5244SG2, D5244T, D5244T2 only
- Volvo S80 (1999–2006)2004All engines except: B5204T5, B5234T7, B5254T2, B6294S2, B6294T
- Volvo S80 (1999–2006)2005Engine B5244SG, B5244SG2, D5244T, D5244T2 only
- Volvo S80 (1999–2006)2006Engine B5244SG, D5244T, D5244T2 only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG, D5244T only
- Volvo V70 (2000–2008)2002All engines except: B5204T5, B5234T3, B5234T7, B5244T3
- Volvo V70 (2000–2008)2003All engines except: B5204T5, B5234T3, B5234T7, B5244T3, B5254T2
- Volvo V70 (2000–2008)2004All engines except: B5204T5, B5234T3, B5234T7, B5254T2, B5254T4
- Volvo V70 (2000–2008)2005Engine B5244SG, B5244SG2, D5244T, D5244T2, D5244T3 only
- Volvo V70 (2000–2008)2006Engine B5244SG, D5244T, D5244T2 only
- Volvo V70 (2000–2008)2007–2008Engine B5244SG only
- Volvo V70 XC / XC70 (2001–2007)2003–2006Engine D5244T only
- Volvo XC90 (2003–)2003–2006Engine D5244T only
What does this fault code mean?
The camshaft position sensor reports the camshaft position relative to the flywheel, and the control module checks that the signal matches. If it does not, the code is stored. The cause may be a fault in the sensor or the trigger wheel, an open circuit in the wiring, incorrectly adjusted camshafts, or a timing belt that has jumped teeth.
Possible causes
- Faulty signal from the camshaft position sensor
- Temporary open circuit in the wiring or in splices
- Incorrectly adjusted camshafts
- Defective camshaft position sensor or engine speed sensor
- Defective trigger wheel
- Timing belt has jumped off the cogs
What you can do
- 1Read and clear the fault code, start the engine and check whether the code returns
- 2Check that the camshaft position sensor connector is secure and free from corrosion
- 3Follow the wiring from the camshaft position sensor and look for chafing or loose wires
- 4Has the timing belt or the camshafts been changed recently? Valve timing may then be wrong, and a workshop should check it
- 5If you have a diagnostic tool, check in live data that the camshaft position sensor signal follows the engine speed when the engine runs
- 6If the fault returns: have a workshop check the camshaft position sensor and the trigger wheel (the reluctor on the camshaft)
Symptoms you may notice3
- The engine dies
- The engine is difficult to start or fails to start
- Poor performance
What the fault can affect3
- The control module uses the engine speed sensor signal as long as it works
- Boost pressure is set to its basic level
- Fuel supply may be cut off in some conditions
General guidance for car owners. Diagnosis on the car can point to a different cause.