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All codes/B0440

B0440

Bluetooth Module Fault

Moderate severity

The infotainment system has detected a fault in the Bluetooth module. Pairing with phones may fail or audio streaming drops out.

The infotainment system has detected a fault in the Bluetooth module. Pairing with phones may fail or audio streaming drops out.

Common causes

  • Bluetooth module internal fault

    One of the most commonly reported causes for this code — check this first.

    high

    Typical part cost: $110-880

  • Antenna cable loose or disconnected

    A plausible cause — test and verify before replacing parts.

    medium

    Typical part cost: $110-880

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First things to check

  1. 1Confirm the code with a scan tool and check for additional related codes.
  2. 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

View on Amazon
Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

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Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

As an Amazon Associate, Wrenchify earns from qualifying purchases. This supports the app at no extra cost to you.

Related codes

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Frequently asked questions

What does B0440 mean?

B0440 means "Bluetooth Module Fault". It is a generic OBD-II code that points to a fault in the body.

What are the most common causes of B0440?

bluetooth module internal fault; antenna cable loose or disconnected — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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