B1874 – OBD-II DTC

OBD-II DTC B1874 – Cellular Phone Handset Not Present

DTC B1874 meaning

DTC B1874 refers to a diagnostic trouble code indicating that the vehicle’s onboard diagnostic system has detected that a cellular phone handset is not present when it is expected to be. This code is typically associated with vehicles equipped with Bluetooth or hands-free phone systems that require a compatible mobile device to function properly.

DTC B1874 symptoms

Common symptoms associated with DTC B1874 may include:

• Inability to connect to a cellular phone via Bluetooth.
• Audio system not responding to phone commands.
• Warning lights or messages on the dashboard related to phone connectivity.
• Reduced functionality of hands-free features.

DTC B1874 causes

Several factors can lead to the triggering of DTC B1874, including:

• Missing or incompatible cellular phone handset.
• Faulty Bluetooth module or software issues.
• Wiring problems or poor connections in the vehicle’s communication system.
• Corrupted settings in the vehicle’s infotainment system.

DTC B1874 seriousness

DTC B1874 is generally considered a moderate issue. While it may not affect the vehicle’s drivability, it can hinder the use of hands-free phone features, which can be a safety concern. Addressing this code is important for ensuring full functionality of the vehicle’s communication systems.

How to diagnose DTC B1874

To diagnose DTC B1874, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1874 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the vehicle’s Bluetooth module and wiring for any visible damage or disconnections.
4. Verify that a compatible cellular phone is present and properly paired with the vehicle.
5. Review the vehicle’s owner manual for specific Bluetooth system requirements.

How to fix DTC B1874 step-by-step instructions

To fix DTC B1874, follow these steps:

1. Ensure that a compatible cellular phone is available and properly paired with the vehicle’s Bluetooth system.
2. Inspect and repair any damaged wiring or connections related to the Bluetooth module.
3. Reset the Bluetooth module by disconnecting the vehicle’s battery for a few minutes.
4. Reprogram or update the vehicle’s infotainment system software if necessary.
5. Clear the DTC using an OBD-II scanner and test the system to ensure the code does not return.

How to erase DTC B1874

To erase DTC B1874, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu and locate DTC B1874.
3. Select the option to clear or erase the trouble codes.
4. Disconnect the OBD-II scanner and turn off the vehicle.
5. Restart the vehicle and check if the code reappears after a short drive.

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