VOLVO
ECM-9918 - 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 has cut the power to the damper motor of the throttle unit, so the throttle returns to its spring-loaded position through the return spring. The code is therefore an indication that other fault codes in the module have put the throttle unit out of operation. It does not point to a separate fault in the throttle itself, so the other fault codes determine how the fault is traced.
Possible causes
- Other fault codes in the engine control module have put the throttle unit out of operation
What you can do
- 1Read the fault codes in the engine control module and note which are stored together with this one
- 2Deal first with the fault codes that put the throttle unit out of operation; this code is only a consequence of them
- 3This code cannot be cleared until the underlying fault codes have been remedied and cleared
- 4Road test the car after the repair and check that idle is smooth and the engine gives normal power
Symptoms you may notice5
- General warning lamp on
- Message in the text display
- Reduced performance
- Cruise control does not work at all
- Uneven idle
What the fault can affect2
- Engine torque is limited by cutting the fuel supply
- The maximum permitted torque depends on the accelerator pedal position and the spring-return position of the throttle
General guidance for car owners. Diagnosis on the car can point to a different cause.