B2455 – OBD-II DTC

OBD-II DTC B2455 – Aux Heater Blower Faulted

DTC B2455 meaning

DTC B2455 refers to an issue with the auxiliary heater blower in a vehicle. This diagnostic trouble code indicates that the blower motor responsible for circulating air through the auxiliary heating system has encountered a fault. The auxiliary heater is typically used to provide additional heating in colder climates, ensuring passenger comfort and efficient engine operation.

DTC B2455 symptoms

Common symptoms associated with DTC B2455 may include:

• Inoperative auxiliary heater blower
• Reduced cabin heating performance
• Unusual noises from the blower motor
• Warning lights on the dashboard
• Increased fuel consumption due to inefficient heating

DTC B2455 causes

Several factors can lead to the triggering of DTC B2455, including:

• Faulty blower motor
• Wiring issues or damaged connectors
• Blower motor resistor failure
• Faulty control module or software issues
• Blocked air intake or exhaust for the auxiliary heater

DTC B2455 seriousness

The seriousness of DTC B2455 can vary based on the vehicle’s use and climate conditions. While it may not immediately affect the vehicle’s drivability, it can lead to:

• Discomfort for passengers in cold weather
• Potential engine performance issues
• Increased wear on the engine due to inadequate heating

Addressing this code promptly is advisable to maintain comfort and vehicle efficiency.

How to diagnose DTC B2455

To diagnose DTC B2455, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the auxiliary heater blower motor and its wiring for visible damage.
3. Check the blower motor resistor for continuity and proper operation.
4. Test the control module for any software updates or faults.
5. Perform a functional test of the auxiliary heater system.

How to fix DTC B2455 step-by-step instructions

To fix DTC B2455, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors related to the blower motor.
3. If the blower motor is faulty, replace it with a new one.
4. Check and replace the blower motor resistor if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the auxiliary heater system to ensure proper operation.

How to erase DTC B2455

To erase DTC B2455, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the DTC menu on the scanner.
4. Select the option to clear or erase the trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to verify that the code does not return.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.