VOLVO
ECM-926C - Electronic throttle unit. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (23)
- 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 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, B6294S2, B6294T only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 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 code means the signal from the throttle unit is too high. It is stored when the engine control module (ECM) attempts to adapt the throttle unit and finds restricted throttle movement, or an opening spring that is not working properly.
Possible causes
- The throttle is sticking or blocked by oil film, dust or similar
- Contact resistance or oxidation linking the ECM to the throttle unit
- Open circuit, or short to ground or supply voltage, in the wiring to the throttle motor
- Short circuit between the wires to the throttle motor
- A damaged throttle unit
What you can do
- 1Read the fault codes and deal first with any that relate to the throttle unit, throttle position sensor or ECM, as they may be the cause
- 2Look for anything blocking the throttle and check that it is not sticking. Clean as needed
- 3Check the connectors between the ECM and the throttle unit: are they secure, and is there corrosion
- 4Use a multimeter on the throttle motor wiring for open circuit, contact with ground or supply voltage, and a short between the two wires
- 5If you have a diagnostic tool: follow the throttle angle in live data while the pedal is pressed and released. It should change smoothly, without jumps
- 6If the code returns, this points to a damaged throttle unit, which then needs replacing and adapting. A workshop with diagnostic equipment does this
Symptoms you may notice2
- Malfunction indicator lamp (MIL) on
- Reduced engine performance
What the fault can affect1
- Depending on the fault, the ECM may cut the supply to the throttle motor so that the throttle goes to its spring-loaded position
General guidance for car owners. Diagnosis on the car can point to a different cause.