AutoCodes – Generic – B2720

B2720 Code - Rear Sonar Sensor Left Outer

Quick Answer

With power and ground supplied to the sonar sensors, the sonar sensors transmit an ultrasonic signal. Common causes include Faulty Rear Sonar Sensor Left Outer, Rear Sonar Sensor Left Outer harness is open or shorted, Rear Sonar Sensor Left Outer 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: B2720 indicates Rear Sonar Sensor Left Outer.
Common causes: Common causes include Faulty Rear Sonar Sensor Left Outer, Rear Sonar Sensor Left Outer harness is open or shorted, Rear Sonar Sensor Left Outer 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 2,111

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 Jan 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2720 Description

With power and ground supplied to the sonar sensors, the sonar sensors transmit an ultrasonic signal. This signal is reflected back to the sensor by objects large enough and close enough to be detected. The sonar sensors measure the time from the transmitted signal to the time the signal is reflected back and send this information to the Sonar Control Unit. The Sonar Control Unit sets the Diagnostic Trouble Code (DTC) when the Rear Sonar Sensor Left Outer is out of factory specifications.

OBDII Code B2720 - Rear Sonar Sensor Left Outer - AutoCodes.com — B2720 Code - Rear Sonar Sensor Left Outer

What does this mean?

What are the Possible Causes of the DTC B2720?

Faulty Rear Sonar Sensor Left Outer
Rear Sonar Sensor Left Outer harness is open or shorted
Rear Sonar Sensor Left Outer circuit poor electrical connection
Faulty Sonar Control Unit

How to Fix the DTC B2720?

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 B2720 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 B2720 code?

Need more information on how to fix the B2720 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2720 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2720 Infiniti — Rear Sonar Sensor Left Outer
B2720 Nissan — Rear Sonar Sensor Left Outer

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 B2720 Code

1. What does OBDII code B2720 mean?

Code B2720 refers to a malfunction in the rear sonar sensor left outer, typically used in parking assist systems to detect obstacles behind the vehicle.

2. What are the symptoms of a B2720 code?

Common symptoms include the parking assist system not functioning properly, warning lights on the dashboard, or an audible alert indicating a sensor issue.

3. What causes the B2720 code to appear?

The code can be triggered by a faulty rear sonar sensor, damaged wiring, corroded connectors, or an issue with the control module for the parking assist system.

4. How do I diagnose a B2720 code?

Diagnose by inspecting the left outer rear sonar sensor, checking for physical damage, testing the wiring and connectors for continuity, and using a scan tool to verify the code.

5. Can I still drive my car with the B2720 code active?

Yes, you can drive the car, but the parking assist system may not function correctly, increasing the risk of collisions when reversing.

6. How do I fix the B2720 code?

Repair typically involves replacing the faulty rear sonar sensor, repairing damaged wiring, cleaning corroded connectors, or reprogramming the parking assist module if needed.

7. How much does it cost to fix a B2720 code?

The repair cost varies based on the issue, but replacing a sonar sensor typically costs between $150 and $500, including parts and labor.

8. Can a dirty sensor cause the B2720 code?

Yes, dirt, debris, or ice covering the sensor can interfere with its operation and trigger the code. Cleaning the sensor may resolve the issue.

9. Does the B2720 code reset on its own after repairs?

In some cases, the code may clear on its own after repairs, but it often requires a scan tool to reset the system.

10. What tools are needed to troubleshoot the B2720 code?

Youâ€™ll need a scan tool with OBDII capabilities, a multimeter to check wiring, and possibly basic tools to access the sensor for inspection or replacement.