AutoCodes – Generic – B2237

B2237 Code - Rear Left Sensor Malfunction

Quick Answer

The No. Common causes include Faulty Rear Left Sensor, Rear Left Sensor harness is open or shorted, Rear Left Sensor 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: B2237 indicates Rear Left Sensor Malfunction.
Common causes: Common causes include Faulty Rear Left Sensor, Rear Left Sensor harness is open or shorted, Rear Left Sensor 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 4,260

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 Oct 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2237 Description

The No. 3 Ultrasonic Sensor (Rear Left Sensor) is installed on the front bumper. The Clearance Warning ECU detects obstacles based on signals received from the Rear Left Sensor. If the Rear Left Sensor circuit has an open, short or other malfunction, it will not function normally. The Diagnostic Trouble Code (DTC) sets if a malfunction of No. 3 Ultrasonic Sensor (Rear Left Sensor).

OBDII Code B2237 - Rear Left Sensor Malfunction - AutoCodes.com — B2237 Code - Rear Left Sensor Malfunction

What does this mean?

What are the Possible Causes of the DTC B2237?

Faulty Rear Left Sensor
Rear Left Sensor harness is open or shorted
Rear Left Sensor circuit poor electrical connection
Faulty Clearance Warning ECU

How to Fix the DTC B2237?

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 B2237 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 B2237 code?

Need more information on how to fix the B2237 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2237 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2237 Buick — Right Door Lock Switch Fault
B2237 Cadillac — Right Door Lock Switch Fault
B2237 Chevrolet — Right Door Lock Switch Fault
B2237 GMC — Right Door Lock Switch Fault
B2237 Lexus — Rear Left Sensor Malfunction
B2237 Toyota — Rear Left Sensor 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 B2237 Code

1. What are common symptoms of OBDII code B2237 (Rear Left Sensor Malfunction)?

- Common symptoms include issues with the rear left sensor, such as inaccurate readings or complete failure of the sensor.

2. What can cause the OBDII code B2237 to trigger?

- The code B2237 can be triggered by a malfunction in the rear left sensor, which may be caused by wiring issues, sensor damage, or sensor calibration problems.

3. How can I diagnose a rear left sensor malfunction related to code B2237?

- Diagnosing a rear left sensor malfunction involves checking the wiring connections, inspecting the sensor for physical damage, and using a diagnostic scan tool to read sensor data.

4. Can a rear left sensor malfunction be repaired, or does the sensor need to be replaced?

- In some cases, a rear left sensor malfunction can be repaired by fixing wiring issues or recalibrating the sensor. However, if the sensor is physically damaged, it may need to be replaced.

5. Are there any DIY tips for troubleshooting code B2237 at home?

- DIY tips for troubleshooting code B2237 include checking the sensor connections, ensuring the sensor is clean and free of debris, and inspecting the sensor for any visible damage.

6. Does code B2237 affect vehicle performance or safety?

- While code B2237 may not directly impact vehicle performance, it can affect the proper functioning of systems that rely on the rear left sensor, such as parking assistance systems.

7. Is it safe to continue driving with OBDII code B2237 present?

- It is generally safe to continue driving with code B2237 present, but it is recommended to address the issue promptly to ensure the proper functioning of the rear left sensor.

8. Can a rear left sensor malfunction cause other codes to trigger in addition to B2237?

- Yes, a rear left sensor malfunction can sometimes cause related codes to trigger, such as codes related to sensor communication errors or sensor calibration issues.

9. How much does it typically cost to repair a rear left sensor malfunction triggering code B2237?

- The cost of repairing a rear left sensor malfunction can vary depending on the cause of the issue, but it may range from a simple DIY fix to a sensor replacement costing a few hundred dollars.

10. Are there any recalls or technical service bulletins related to OBDII code B2237?

- It is recommended to check with the vehicle manufacturer or a trusted automotive service provider to see if there are any recalls or technical service bulletins related to OBDII code B2237 and the rear left sensor malfunction.