B0440Bluetooth Module Fault
- Generic OBD-II code · Body
- How the car detects it
- 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.
- What you may notice
- Phone cannot be paired or is not found
- Hands-free calls drop or music streaming stops
- Bluetooth menu greyed out or missing
- Likely causes
- LikelySoftware fault or hung state of the Bluetooth/telematics unit
- PossibleBluetooth chip or its module failed internally
- RarePoor supply or ground connection at the module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.