Body, generic

B0101 Sensor Cleaning Air Blower Actuator B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

B0101 reports a fault of the second cleaning air source, blower B. A second unit makes sense where sensors are spread over the body: a roof pod and a bumper or corner sensor need separate air supplies. Not every design uses a fan; Uber's 2016 patent (now Aurora) feeds lidar and camera air knives from a compressor and accumulator held at about 140–160 psi, with one solenoid valve per outlet and a pressure sensor that raises a warning on a leak. AUMOVIO's lidar nozzles use compressed air to strip water droplets and to clear dust without washer fluid, and Kautex's Allegro systems combine water and air for camera and lidar. The split between A and B is not published by any carmaker, nor is B0101 itself.

Likely causes

Blower or compressor B worn out or drawing too much current
Leaking or split air hose so blower B cannot build pressure
Water or salt ingress into blower B at an exposed mounting point

Symptoms

  • Cleaning fault shown for the sensor group served by blower B
  • Water droplets or dust remain on lidar or camera window
  • Assistance functions reduced when the affected sensor goes blind

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,200
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

sensor cleaning air blower bobject detection maintenance module b

Related codes

B0100B0103B0105U022F

References: patents.google.com, aumovio.com, kautex.com.