B2721 Infiniti Code - Rear Sonar Sensor Left Inner
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 Inner, Rear Sonar Sensor Left Inner harness is open or shorted, Rear Sonar Sensor Left Inner 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
- B2721 Infiniti indicates Rear Sonar Sensor Left Inner.
- Common causes
- Common causes include Faulty Rear Sonar Sensor Left Inner, Rear Sonar Sensor Left Inner harness is open or shorted, Rear Sonar Sensor Left Inner 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.
Code B2721 Infiniti Description
What are the Possible Causes of the DTC B2721 Infiniti?
- Faulty Rear Sonar Sensor Left Inner
- Rear Sonar Sensor Left Inner harness is open or shorted
- Rear Sonar Sensor Left Inner circuit poor electrical connection
- Faulty Sonar Control Unit
How to Fix the DTC B2721 Infiniti?
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 B2721 Infiniti 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 B2721 Infiniti code?
Need more information on how to fix the B2721 Infiniti code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B2721 Infiniti code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B2721 Infiniti Code
1. What does the OBDII code B2721 mean on an Infiniti?
The B2721 code indicates a fault with the Rear Sonar Sensor Left Inner, which is part of the vehicle's parking assist system.
2. What are the symptoms of the B2721 code on an Infiniti?
Symptoms may include a non-functional parking assist system, audible warnings not working, or an alert on the dashboard indicating a sonar sensor issue.
3. What causes the B2721 code to trigger?
Common causes include a damaged or dirty left inner rear sonar sensor, a disconnected or faulty wiring harness, or a malfunction in the parking assist module.
4. Can a dirty sensor cause the B2721 code?
Yes, dirt, debris, or ice on the left inner rear sonar sensor can obstruct its operation and trigger the code.
5. How do you diagnose the B2721 code on an Infiniti?
Start by inspecting the sensor for physical damage or dirt, check wiring connections for damage or corrosion, and use a diagnostic tool to confirm the issue.
6. Is it safe to drive with the B2721 code active?
Yes, but the parking assist system may not function correctly, increasing the risk of collisions during parking or reversing.
7. How can you fix the B2721 code?
Cleaning the sensor, repairing or replacing damaged wiring, or replacing the faulty sensor itself can resolve the issue.
8. How much does it cost to repair the B2721 code on an Infiniti?
The repair cost depends on the issue, ranging from $50 for cleaning to $200–$400 for sensor replacement, excluding labor costs.
9. Can you reset the B2721 code without fixing the problem?
The code may clear temporarily if reset, but it will return if the underlying issue is not resolved.
10. What tools are needed to fix the B2721 code?
You may need a diagnostic scan tool, basic hand tools, and cleaning supplies, depending on the nature of the problem.
Discuss the causes and fixes for B2721 Infiniti OBDII Code
Code B2721 Infiniti comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
