B1236 – OBD-II DTC

OBD-II DTC B1236 – Window Feedback Loss of Signal

DTC B1236 meaning

DTC B1236 refers to a “Window Feedback Loss of Signal” issue in the vehicle’s onboard diagnostics system. This code indicates that the power window system is not receiving the expected feedback signal from the window motor or the window position sensor. The feedback signal is crucial for the proper operation of the power window system, allowing it to know the position of the window and to control its movement accurately.

DTC B1236 symptoms

Common symptoms associated with DTC B1236 may include:

• Power windows that do not operate at all.
• Windows that move erratically or stop mid-operation.
• Inability to auto-up or auto-down the windows.
• Warning lights or messages on the dashboard related to the window system.

DTC B1236 causes

Several factors can lead to the triggering of DTC B1236, including:

• Faulty window motor or window regulator.
• Damaged or corroded wiring and connectors in the window circuit.
• Defective window position sensor.
• Issues with the body control module (BCM) or power window switch.

DTC B1236 seriousness

The seriousness of DTC B1236 can vary. While it may not pose an immediate safety risk, it can lead to inconvenience due to non-functional windows. Additionally, unresolved electrical issues can potentially lead to further complications in the vehicle’s electrical system, making it important to address the problem promptly.

How to diagnose DTC B1236

To diagnose DTC B1236, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the power window system for any visible damage or loose connections.
3. Check the window motor and regulator for proper operation.
4. Test the window position sensor for functionality.
5. Examine the wiring and connectors for signs of wear or corrosion.
6. Consult the vehicle’s service manual for specific diagnostic procedures related to the power window system.

How to fix DTC B1236 step-by-step instructions

To fix DTC B1236, follow these steps:

1. Clear the DTC using an OBD-II scanner.
2. Inspect and repair any damaged wiring or connectors in the window circuit.
3. Replace the faulty window motor or regulator if necessary.
4. Replace the window position sensor if it is found to be defective.
5. Test the power window system to ensure proper operation.
6. Re-scan the system to confirm that the DTC has not returned.

How to erase DTC B1236

To erase DTC B1236, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Follow the prompts to clear the DTC from the system.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

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