AutoCodes – Generic – B1571

B1571 Code - Door Ajar Left Right Switch Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Door Ajar Left Right Switch. Common causes include Faulty Door Ajar Left Right Switch, Door Ajar Left Right Switch harness is open or shorted, Door Ajar Left Right Switch circuit poor electrical connection. 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 Left Right Switch, Door Ajar Left Right Switch harness is open or shorted, Door Ajar Left Right Switch circuit poor electrical connection.
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.

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Code Popularity 11,540

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1571 Description

The Body Control Module (BCM) monitors the Door Ajar Left Right Switch. The BCM sets the OBDII code when the Door Ajar Left Right Switch is not to factory specifications.

OBDII Code B1571 - Door Ajar Left Right Switch Circuit Failure - AutoCodes.com — B1571 Code - Door Ajar Left Right Switch Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1571?

Faulty Door Ajar Left Right Switch
Door Ajar Left Right Switch harness is open or shorted
Door Ajar Left Right Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1571?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1571 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1571 code?

Need more information on how to fix the B1571 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1571 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1571 Lexus — Manual Switch Green Indicator Malfunction
B1571 Toyota — Manual Switch Green Indicator Malfunction

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.