AutoCodes – Ford – B1572 Ford

B1572 Ford Code - Door Ajar Left Right Switch Circuit Open

Quick Answer

The Smart Junction Box (SJB) sends a voltage signal to the door ajar switches. 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: B1572 Ford indicates Door Ajar Left Right Switch Circuit Open.
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 1,926

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 Feb 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1572 Ford Description

The Smart Junction Box (SJB) sends a voltage signal to the door ajar switches. The door ajar switch is closed with the door closed. When the door is opened, the signal to ground is interrupted indicating an open door to the SJB. The Diagnostic Trouble Code (DTC) sets when the SJB detects an open from the LH rear door ajar input circuit.

OBDII Code B1572 Ford - Door Ajar Left Right Switch Circuit Open - AutoCodes.com — B1572 Ford Code - Door Ajar Left Right Switch Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1572 Ford?

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 Smart Junction Box (SJB)

How to Fix the DTC B1572 Ford?

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 B1572 Ford 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.

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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 B1572 Ford Code

1. What are the common symptoms of OBDII code B1572 Ford (Door Ajar Left Right Switch Circuit Open)?

- The common symptoms include the door ajar warning light staying illuminated on the dashboard, interior lights remaining on while driving, and issues with power door locks.

2. What causes the OBDII code B1572 Ford to trigger?

- This code is typically triggered by a faulty left or right door ajar switch, wiring issues, or a poor connection in the circuit.

3. How can I diagnose the Door Ajar Left Right Switch Circuit Open issue?

- You can diagnose this issue by visually inspecting the door ajar switches, checking the wiring for any damage or corrosion, and using a multimeter to test the circuit continuity.

4. Can a faulty door latch cause the B1572 Ford code to appear?

- Yes, a faulty door latch can sometimes cause issues with the door ajar switches and trigger the B1572 code.

5. What are some repair tips for fixing the Door Ajar Left Right Switch Circuit Open problem?

- Repair tips may include cleaning the door ajar switches, repairing or replacing damaged wiring, ensuring proper connections, and resetting the OBDII system after making repairs.

6. Is it safe to continue driving with the B1572 Ford code active?

- While it may not affect the drivability of the vehicle, it is recommended to address the issue promptly to prevent potential battery drain or other electrical problems.

7. Can I reset the B1572 Ford trouble code without fixing the underlying issue?

- Resetting the code without fixing the underlying problem will likely result in the code reappearing once the issue is detected again by the vehicle's system.

8. Are there any recalls or service bulletins related to the B1572 Ford code?

- It is advisable to check with your local Ford dealership or visit the manufacturer's website to see if there are any recalls or service bulletins related to this specific OBDII code.

9. How long does it typically take to repair the Door Ajar Left Right Switch Circuit Open issue?

- The repair time can vary depending on the exact cause of the problem, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the issue.

10. Can I fix the B1572 Ford code myself, or do I need to take my vehicle to a professional mechanic?

- Depending on your experience and comfort level with automotive repairs, you may be able to fix the issue yourself by following repair guides and using the necessary tools. If in doubt, it's best to consult a professional mechanic for assistance.