Code Definition

B109E — AC Compressor First Run-In Not Performed

System: Body  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About B109E

B109E is a manufacturer-specific body diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B109E is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Climatic or Climatronic HVAC control module on Volkswagen Group vehicles stores adaptation data for the variable displacement air conditioning compressor, including a 'first run in' basic setting that must be performed after module replacement or major HVAC component service. DTC B109E is logged when the control module detects that this mandatory basic setting routine has not been successfully completed since the last reset of its adaptation memory. The run in procedure is initiated through VAS, ODIS, or equivalent diagnostic software and gradually ramps the compressor through its operatin...

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