AutoCodes – Generic – B2704

B2704 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: B2704 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 1,850

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 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2704 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 B2704 - Rear Sonar Sensor Left Outer - AutoCodes.com — B2704 Code - Rear Sonar Sensor Left Outer

What does this mean?

What are the Possible Causes of the DTC B2704?

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 B2704?

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 B2704 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 B2704 code?

Need more information on how to fix the B2704 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2704 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2704 Infiniti — Rear Sonar Sensor Left Outer
B2704 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 B2704 Code

1. What are the common symptoms of OBDII code B2704 (Rear Sonar Sensor Left Outer)?

The common symptoms of OBDII code B2704 include malfunctioning or complete failure of the rear parking assist system on the left outer side of the vehicle.

2. What can cause OBDII code B2704 to be triggered?

OBDII code B2704 is usually triggered when there is a fault in the wiring, connections, or the rear sonar sensor itself on the left outer side of the vehicle.

3. How can I diagnose the issue related to OBDII code B2704?

To diagnose the issue related to OBDII code B2704, you can start by visually inspecting the wiring and connections of the rear sonar sensor on the left outer side. You can also use a diagnostic scanner to pinpoint the exact source of the problem.

4. Can I repair OBDII code B2704 on my own?

If you have experience with automotive repairs and diagnostics, you may be able to repair OBDII code B2704 on your own by fixing the wiring, connections, or replacing the rear sonar sensor on the left outer side.

5. Is it safe to drive with OBDII code B2704 active?

It is generally safe to drive with OBDII code B2704 active, but you may not have the rear parking assist system functional on the left outer side of the vehicle. It is recommended to get the issue diagnosed and repaired as soon as possible.

6. What are the potential consequences of ignoring OBDII code B2704?

Ignoring OBDII code B2704 may result in the rear parking assist system not working correctly on the left outer side of the vehicle, leading to potential accidents or difficulty in parking in tight spaces.

7. How much does it typically cost to repair OBDII code B2704?

The cost of repairing OBDII code B2704 can vary depending on the extent of the issue and whether you choose to do the repairs yourself or take your vehicle to a mechanic. Costs may include replacement parts and labor fees.

8. Can extreme weather conditions affect OBDII code B2704?

Extreme weather conditions, such as excessive heat or moisture, can potentially affect the wiring and connections of the rear sonar sensor, leading to the triggering of OBDII code B2704.

9. Are there any preventive measures I can take to avoid OBDII code B2704 in the future?

To prevent OBDII code B2704 from being triggered in the future, you can regularly inspect the wiring and connections of the rear sonar sensor on the left outer side of the vehicle and address any issues promptly.

10. How long does it typically take to repair OBDII code B2704?

The repair time for OBDII code B2704 can vary depending on the exact cause of the issue and the complexity of the repairs needed. It can take anywhere from a few hours to a full day to complete the repairs.