VOLVO
ECM-982A - Air mass. Level too low
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:
9 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008), V70 XC (1998–2000), V70 XC / XC70 (2001–2007)
Show models by year and engine (16)
- Volvo C70 Cabriolet (1998–2005)1999, 2001–2002
- Volvo C70 Cabriolet (1998–2005)2000All engines except: B5244S
- Volvo C70 Coupé (1998–2002)1999All engines except: B5254S DENSO
- Volvo C70 Coupé (1998–2002)2000All engines except: B5244S
- Volvo C70 Coupé (1998–2002)2001–2002
- Volvo S60 (2001–2009)2001All engines except: B5244S, B5244S2, D5244T
- Volvo S70 (1997–2000)1999Engine B5204T3, B5204T4, B5234T3, B5234T7, B5254T only
- Volvo S70 (1997–2000)2000Engine B5204T3, B5204T4, B5234T3, B5234T7, B5244T only
- Volvo S80 (1999–2006)1999–2000All engines except: B5244S, B5244S2, D5252T MSA 15.8
- Volvo S80 (1999–2006)2001Engine B5204T5, B5234T7, B5244T3, B6284T, B6294S only
- Volvo V70 (1997–2000)1999Engine B5204T3, B5204T4, B5234T3, B5234T7, B5234T8, B5254T only
- Volvo V70 (1997–2000)2000All engines except: B5244S, B5244S2, B5244SG, B5244SG2, D5252T MSA 15.8
- Volvo V70 (2000–2008)2000All engines except: D5252T MSA 15.8
- Volvo V70 (2000–2008)2001Engine B5204T5, B5234T3, B5234T7, B5244T3 only
- Volvo V70 XC (1998–2000)1999–2000
- Volvo V70 XC / XC70 (2001–2007)2001
What does this fault code mean?
The engine control module (ECM) works out a lowest permitted air mass from throttle angle and engine speed, and compares it with the measured air mass. If the measured air mass is too low for a short moment, the code is stored.
Possible causes
- Object blocking the throttle plate, such as an oil film or dust
- Defective air mass meter
- Defective engine control module
What you can do
- 1Look for air leaks in the intake and for loose charge air pipes
- 2Check that the air mass meter and the boost pressure sensor are correctly fitted, and look for air leaks around them. Even very small leaks can cause the code
- 3If you have a diagnostic tool: read the measured air mass in live data at idle and when pressing the throttle, and check that it rises evenly as the pedal goes down
- 4If no other code is present and the counters show the fault has occurred often recently, it is easier to reproduce during troubleshooting. Freeze-frame values show when it happened
- 5After repair: clear the code and leave the ignition off for a while before test driving, so the throttle module resets
Symptoms you may notice3
- Poor accelerator pedal response
- Cruise control does not work at all
- Uneven idle
What the fault can affect3
- The throttle closes when braking, and the pedal position is ignored while the brake pedal is pressed
- Cruise control is switched off for the driving cycle in which the fault was detected
- Engine speed is controlled by fuel cut-off and capped at a low value
General guidance for car owners. Diagnosis on the car can point to a different cause.