VOLVO
ECM-984A - Engine control module (ECM), load signal. Internal fault
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS40 (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 (7)
- Volvo S40 (2004–2013)2004Engine B5254T3 only
- Volvo S60 (2001–2009)2004Engine B5234T3, B5234T7, B5254T2, B5254T4 only
- Volvo S80 (1999–2006)2004Engine B5234T7, B5254T2, B6294S2, B6294T only
- Volvo V50 (2004–2013)2004Engine B5254T3 only
- Volvo V70 (2000–2008)2004Engine 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 engine control module (ECM) has registered an internal fault, which shows that the calculated load signal is lower than the internal monitoring has worked out. The code is set while the engine runs above a certain speed.
Possible causes
- Blocked exhaust system
- Blocked intake system
- Air leakage in the intake system
- Defective engine control module (ECM)
What you can do
- 1Check the intake and exhaust systems for blockages
- 2Check the intake system for air leakage, and the inside of the throttle housing for contamination. A dirty housing reduces airflow to the engine
- 3If the fault remains after these checks, a workshop should program or replace the engine control module if the fault is permanent
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.