VOLVO
ECM-914C - Throttle unit. 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:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (8)
- Volvo C30 (2007–2013)2007–2011Engine B5244S4 only
- Volvo C70 (2006–2013)2006All engines except: B5254T3
- Volvo C70 (2006–2013)2007–2010Engine B5244S4, B5244S5 only
- Volvo C70 (2006–2013)2011Engine B5244S4 only
- Volvo S40 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo S40 (2004–2013)2005–2010Engine B5244S4, B5244S5, B5244S7 only
- Volvo V50 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo V50 (2004–2013)2005–2010Engine B5244S4, B5244S5, B5244S7 only
What does this fault code mean?
The engine control module (ECM) monitors the throttle unit's position sensors and sets the code when either signal is faulty. The fault can be a signal that is too high or too low. The cause may lie in the wiring and connectors around the throttle unit, or in the unit itself.
Possible causes
- Signal cables short-circuited to voltage, giving a signal that is too high
- Signal cables short-circuited to ground or open-circuit, giving a signal that is too low
- Power supply to the throttle unit is short-circuited or open-circuit
- Contact resistance or oxidation in the connectors
- Damaged throttle unit
What you can do
- 1Check the connectors at the throttle unit and the engine control module for contact resistance and oxidation
- 2Use a multimeter to check that the signal cables are not open-circuit and not short-circuited to ground or voltage
- 3Erase the fault code and test drive. If it returns although nothing else has been found, the throttle unit may need to be replaced by a workshop
Symptoms you may notice2
- The car's performance is reduced
- The cruise control does not work at all
What the fault can affect2
- If one signal fails, the ECM uses the other one instead
- The cruise control is switched off while the fault is active
General guidance for car owners. Diagnosis on the car can point to a different cause.