VOLVO
ECM-985A - Engine control module (ECM). Internal fault. Intermittent fault
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:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (5)
- Volvo S60 (2001–2009)2004Engine B5204T5, B5234T3, B5234T7, B5254T2, B5254T4 only
- Volvo S80 (1999–2006)2004Engine B5204T5, B5234T7, B5254T2, B6294S2, B6294T only
- Volvo V70 (2000–2008)2004Engine B5204T5, B5234T3, B5234T7, B5254T2, B5254T4 only
- Volvo V70 XC / XC70 (2001–2007)2004All engines except: D5244T
- Volvo XC90 (2003–)2004All engines except: D5244T
What does this fault code mean?
The fault is intermittent, meaning it has occurred at some point but may not be present now. The engine control module (ECM) registered an internal fault on an earlier occasion, but has since established that the fault is no longer present.
Possible causes
- Defective engine control module (ECM)
What you can do
- 1Clear the code and test drive the car. If the fault is no longer present, there is nothing more to fix for now
- 2If the code returns, a workshop should decide whether the engine control module needs replacing
Symptoms you may notice4
- Maximum engine speed is low
- 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.