B2469 – OBD-II DTC

OBD-II DTC B2469 – Aux Heater Coolant Pump Circuit Open

DTC B2469 meaning

DTC B2469 refers to an issue with the auxiliary heater coolant pump circuit being open. This diagnostic trouble code indicates that the powertrain control module (PCM) has detected a malfunction in the circuit that controls the auxiliary heater coolant pump, which is responsible for circulating coolant to maintain optimal engine temperature and provide cabin heating.

DTC B2469 symptoms

Common symptoms associated with DTC B2469 may include:

• Inoperative auxiliary heater
• Reduced cabin heating performance
• Engine overheating
• Warning lights illuminated on the dashboard
• Increased fuel consumption

DTC B2469 causes

Several factors can lead to the triggering of DTC B2469, including:

• Open or shorted wiring in the coolant pump circuit
• Faulty auxiliary heater coolant pump
• Defective connectors or terminals
• Issues with the powertrain control module (PCM)
• Blown fuses related to the coolant pump circuit

DTC B2469 seriousness

DTC B2469 is considered a moderate to serious issue. While it may not immediately affect the drivability of the vehicle, it can lead to engine overheating and reduced cabin heating, which can compromise comfort and safety. Ignoring this code may result in further damage to the engine or heating system.

How to diagnose DTC B2469

To diagnose DTC B2469, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the wiring and connectors for any visible damage or corrosion.
3. Check the fuses related to the auxiliary heater coolant pump circuit.
4. Test the auxiliary heater coolant pump for proper operation.
5. Verify the functionality of the PCM and its ability to control the pump.

How to fix DTC B2469 step-by-step instructions

To fix DTC B2469, follow these steps:

1. Repair or replace any damaged wiring or connectors in the coolant pump circuit.
2. Replace any blown fuses related to the auxiliary heater coolant pump.
3. If the auxiliary heater coolant pump is faulty, replace it with a new unit.
4. Recheck the PCM for any software updates or faults.
5. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.

How to erase DTC B2469

To erase DTC B2469, 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 ensure the code does not reappear.

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.