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Engine-Codes – Generic – B1571

B1571 Code - Door Ajar Left Right Switch Circuit Failure

Quick Answer

The B1571 diagnostic trouble code (DTC) indicates a Door Ajar Left Right Switch Circuit Failure. Common causes include Faulty door ajar switch, Wiring harness damage or corrosion, Loose or disconnected electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1571 indicates Door Ajar Left Right Switch Circuit Failure.
Common causes
Common causes include Faulty door ajar switch, Wiring harness damage or corrosion, Loose or disconnected electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code B1571 Description

The B1571 diagnostic trouble code (DTC) indicates a Door Ajar Left Right Switch Circuit Failure. This code is typically found in vehicles equipped with a door ajar warning system, which alerts the driver if any of the doors are not fully closed. When this code is triggered, it means that there is a malfunction in the circuit that controls the left or right door ajar switch. This can lead to issues with the door ajar warning system, causing a false warning light to illuminate on the dashboard or preventing the warning light from activating when a door is actually open.

OBDII Code B1571 - Door Ajar Left Right Switch Circuit Failure
B1571 Code - Door Ajar Left Right Switch Circuit Failure

Common Causes of B1571

  1. Faulty door ajar switch.
  2. Wiring harness damage or corrosion.
  3. Loose or disconnected electrical connections.
  4. Malfunctioning door control module.
  5. Water intrusion causing short circuits in the door switch circuit.

Symptoms of B1571

  1. Door ajar warning light stays on even when all doors are closed.
  2. No warning light appears when a door is left open.
  3. Interior lights do not turn off when doors are closed.
  4. Security system may not activate properly when doors are left open.
  5. Battery drain due to door ajar warning system remaining active.

How to Fix B1571

  1. Use a diagnostic scan tool to retrieve the specific door ajar switch causing the issue.
  2. Inspect the door ajar switch for physical damage or corrosion and replace if necessary.
  3. Check the wiring harness for any damage or loose connections and repair as needed.
  4. Test the door control module for proper function and replace if faulty.
  5. Clear the DTC and test the door ajar warning system to ensure proper operation.

Cost to Fix B1571

The cost of repairing a Door Ajar Left Right Switch Circuit Failure can vary depending on the specific cause of the issue and the labor rates at the repair shop. On average, the parts for this repair can range from $50 to $200, while labor costs can be between $100 and $300. Overall, the total cost of resolving this issue may fall between $150 and $500. It's recommended to contact local auto repair shops for accurate pricing based on your vehicle's make and model.

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Code B1571 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1571 Code

1. What are the common symptoms of OBDII code B1571 (Door Ajar Left Right Switch Circuit Failure)?

- Common symptoms include inaccurate door ajar warnings on the dashboard, interior lights staying on, and power door locks malfunctioning.

2. What are the possible causes of OBDII code B1571?

- The code B1571 can be caused by a faulty door ajar switch, damaged wiring or connectors in the circuit, or a problem with the body control module.

3. How can I diagnose the issue related to code B1571?

- To diagnose the issue, you can visually inspect the door ajar switches and their wiring, use a multimeter to test for continuity, and scan the vehicle's computer for specific error codes.

4. Can I repair the OBDII code B1571 issue myself?

- Depending on your skill level and access to tools, you may be able to repair the issue yourself by replacing the faulty door ajar switch, repairing damaged wiring, or resetting the body control module.

5. Are there any simple troubleshooting steps I can take for code B1571?

- Yes, you can start by manually checking and closing all doors properly, ensuring the door switches are clean and functioning correctly, and resetting the vehicle's computer to see if the issue resolves.

6. Is it safe to continue driving with OBDII code B1571 active?

- It is generally safe to drive with the code B1571, but you may experience inconvenience with interior lights or door locking mechanisms. It is recommended to address the issue promptly.

7. How much does it typically cost to repair OBDII code B1571?

- The cost of repairing code B1571 can vary depending on the cause of the issue, the labor rates of the repair shop, and whether you choose to do the repairs yourself. Costs may range from a simple switch replacement to more extensive wiring repairs.

8. Can OBDII code B1571 cause any other problems in the vehicle?

- While the code B1571 itself may not cause significant issues, continued operation with faulty door ajar switches can lead to drained batteries, interior light malfunctions, or security concerns due to doors not locking properly.

9. Will resetting the OBDII system clear the B1571 code?

- Resetting the OBDII system may temporarily clear the B1571 code, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.

10. How can I prevent OBDII code B1571 from occurring in the future?

- To prevent code B1571, regularly inspect and maintain your vehicle's door ajar switches, keep the door seals clean and free of debris, and address any issues with the door locking system promptly to avoid strain on the circuit.

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