VOLVO
ECM-985C - Engine control module (ECM), fuel shut-off system. Internal fault
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 ECM has registered an internal fault in how it converts analogue signals into digital values (the A/D converter). The code is set, and engine speed and torque are limited.
Possible causes
- Damaged engine control module (ECM)
What you can do
- 1Clear the code and test drive the car to see whether it returns
- 2For a permanent fault the engine control module is replaced, which a workshop does
Symptoms you may notice4
- Low maximum engine speed
- Cruise control does not work at all
- Uneven idle
- Malfunction indicator lamp lit
What the fault can affect1
- Engine speed and torque are limited to a calculated reasonable value
General guidance for car owners. Diagnosis on the car can point to a different cause.