VOLVO
CCM-0021 - Air quality sensor. Internal fault
System
Climate Control Module (CCM)
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–)
What does this fault code mean?
The control module has found a malfunction in the air quality sensor circuit. It applies to cars with electronic climate control (ECC) and an air quality sensor. The fault may be intermittent, meaning it has occurred before but is not present now. While it persists the recirculation is not allowed to close in air quality mode.
Possible causes
- Fault inside the air quality function circuit
What you can do
- 1Clear the fault code and test drive. Check whether it returns over a few drives
- 2If it does not return, no further action is needed
- 3If the fault returns, the sensor is probably defective. Have a workshop replace the air quality sensor
- 4If you have a diagnostic tool, follow the sensor value in live data while you affect the sensor and check the value changes
Symptoms you may notice1
- Poor air quality in the cabin
What the fault can affect2
- The recirculation is not allowed to close in air quality mode
- No air quality function
General guidance for car owners. Diagnosis on the car can point to a different cause.