VOLVO
CCM-DD22 - LIN bus 2. Incorrect check sum
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 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
Two damper motors on LIN bus 2 have the same identity, according to the climate control module (CCM). This may be because a damper motor was fitted in the wrong way, or because a new damper motor has been given an identity that already exists on the bus. This causes a conflict on the bus, and airflow and heating may then work incorrectly.
Possible causes
- Two damper motors with the same identity are installed on LIN bus 2
- A damper motor may have been installed in the wrong way
What you can do
- 1Has a damper motor recently been replaced? If so, check that it is fitted in the right place
- 2Check that the damper motors sit in the position their ID indicates
- 3Clear the code and road test the car to see whether it returns
- 4Have a workshop identify the damper motors again with diagnostic equipment, since a new damper motor must be given its own identity
Symptoms you may notice5
- Mist on the windows and/or the outside mirrors
- Air flow problem
- Poor heating in the cabin
- Front seat heating does not operate
- Poor air quality in the cabin
General guidance for car owners. Diagnosis on the car can point to a different cause.