Body, generic

B0440 Bluetooth Module Fault

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

No public J2012 source lists B0440, and no carmaker explains it, so the code cannot be verified. The title concerns the Bluetooth unit that pairs a phone for hands-free calls and music streaming. Automotive chips such as NXP's AW300, qualified to AEC-Q100, handle the HFP and A2DP profiles; TI's WiLink 8Q family combines Bluetooth with Wi-Fi and GNSS for infotainment units. Often the radio part sits inside the telematics or head unit: the Saab 9-5 (2011) places it in the OnStar module and switches Bluetooth off when B2485 reports its antenna open or grounded. A module fault shows as failed pairing, dropped calls or no streaming. The antenna circuit has its own title, B0460, the microphone B0450; bus loss to the telematics unit is U0198.

Likely causes

Software fault or hung state of the Bluetooth/telematics unit
Bluetooth chip or its module failed internally
Poor supply or ground connection at the module

Symptoms

  • Phone cannot be paired or is not found
  • Hands-free calls drop or music streaming stops
  • Bluetooth menu greyed out or missing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–2.5 h

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

Parts involved

bluetooth moduleinfotainment modulebluetooth antenna

Related codes

B0460B0450U0198

References: nxp.com, ti.com, saabwisonline.com.