B1A9C on the 2019 Mercedes-Benz Sprinter
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| LI83.10-N-071291 | 2023-01-05. Service bulletin. Complaint Various customer concerns of Climate Control system operating inadequately. Cause Stepper motor linkage in the heater case may cause a mechanical fault during actuation during unfavorable environmental conditions. NOTE: If the vehicle is equipped with H13 (rear additional heat exchanger), There is an additional stepper motor in the rear heater case under the vehicle. This stepper motor can influence the normalization process. May include fault code: B1A9C07 the output for control valve "Left water valve" has a malfunction. There is a mechanical fault. The component is called N29/12 (rear additional heat exchanger ) . Remedy: See instructions |
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1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.