AutoCodes – Generic – U11FB

U11FB Code - Lost Communication With Left Blind Spot Sensor

Quick Answer

The Blind Spot Monitor (BSM) system has two primary components; a Left Blind Spot Sensor (LBSS) and Right Blind Spot Sensor (RBSS). Common causes include Faulty Left Blind Spot Sensor, Left Blind Spot Sensor harness is open or shorted, Left Blind Spot 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: U11FB indicates Lost Communication With Left Blind Spot Sensor.
Common causes: Common causes include Faulty Left Blind Spot Sensor, Left Blind Spot Sensor harness is open or shorted, Left Blind Spot 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 5,632

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 May 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U11FB Description

The Blind Spot Monitor (BSM) system has two primary components; a Left Blind Spot Sensor (LBSS) and Right Blind Spot Sensor (RBSS). Each sensor includes an internal microprocessor that monitors and controls both the sensor and the blind spot indicator. The two sensors are concealed behind the outboard ends of the rear bumper fascia.
The microprocessor analyzes the sensor data to determine whether any detected objects should be reported. When it is determined that an object should be reported, the Sensor controls its respective left or right BSM display directly through a hard wired output to the Outside Rearview Mirrors. The sensor also sends an electronic request message over the CAN Bus to the radio. The Radio then mutes any current output through the speakers and generates a chime as an audible alert.
Each sensor performs a bulb test by illuminating the triangle icon in the Outside Rearview Mirror at each ignition ON cycle.
The Diagnostic Trouble Code (DTC) sets when no BUS messages from the Left Blind Spot Sensor (LBSS) are received for greater than 1.05 seconds.

OBDII Code U11FB - Lost Communication With Left Blind Spot Sensor - AutoCodes.com — U11FB Code - Lost Communication With Left Blind Spot Sensor

What does this mean?

What are the Possible Causes of the DTC U11FB?

Faulty Left Blind Spot Sensor
Left Blind Spot Sensor harness is open or shorted
Left Blind Spot Sensor circuit poor electrical connection

How to Fix the DTC U11FB?

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 U11FB 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 U11FB code?

Need more information on how to fix the U11FB code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

U11FB Chrysler — Lost Communication With Left Blind Spot Sensor
U11FB Dodge — Lost Communication With Left Blind Spot Sensor
U11FB Fiat — Lost Communication With Left Blind Spot Sensor
U11FB Jeep — Lost Communication With Left Blind Spot Sensor
U11FB RAM — Lost Communication With Left Blind Spot Sensor

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 U11FB Code

1. What are the common symptoms of OBDII code U11FB (Lost Communication With Left Blind Spot Sensor)?

- Common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, loss of functionality in the left blind spot sensor system, and potential error messages related to the sensor.

2. What are the possible causes of OBDII code U11FB?

- The code U11FB can be caused by issues such as a faulty left blind spot sensor, damaged wiring or connectors in the sensor circuit, a software glitch in the sensor system, or a communication breakdown between the sensor and the vehicle's onboard computer.

3. How can I diagnose the U11FB code related to the left blind spot sensor issue?

- Diagnosing the U11FB code involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors connected to the left blind spot sensor, conducting a visual inspection of the sensor for physical damage, and performing any necessary software updates for the sensor system.

4. Are there any quick repair tips for resolving the U11FB code related to the left blind spot sensor problem?

- Quick repair tips include checking and repairing any damaged wiring or connectors, resetting the sensor system by disconnecting the battery for a few minutes, and ensuring that the sensor is clean and free from any obstructions.

5. Is it safe to drive with the U11FB code indicating a lost communication with the left blind spot sensor?

- It is generally safe to drive with the U11FB code, but it is recommended to address the issue promptly to ensure the proper functioning of the left blind spot sensor system for enhanced safety while driving.

6. Can the U11FB code be cleared/reset without fixing the underlying issue with the left blind spot sensor?

- While the U11FB code can be cleared/reset using an OBDII scanner, it is important to address the root cause of the issue with the left blind spot sensor to prevent the code from reoccurring and ensure the proper operation of the sensor system.

7. Is it possible to replace the left blind spot sensor myself to resolve the U11FB code?

- Depending on your level of automotive expertise, it may be possible to replace the left blind spot sensor yourself. However, it is recommended to consult the vehicle's service manual or seek professional assistance to ensure the correct installation and calibration of the new sensor.

8. Are there any recalls or technical service bulletins related to the U11FB code and left blind spot sensor communication issue?

- It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to the U11FB code and the left blind spot sensor problem, as there may be specific repair procedures or solutions provided by the manufacturer.

9. Can extreme weather conditions affect the communication between the left blind spot sensor and the vehicle, triggering the U11FB code?

- Extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially affect the communication between the left blind spot sensor and the vehicle, leading to intermittent issues and triggering the U11FB code. It is important to keep the sensor clean and free from any environmental debris.

10. What is the typical cost to repair the U11FB code related to the lost communication with the left blind spot sensor?

- The cost of repairing the U11FB code can vary depending on the root cause of the issue, the need for parts replacement, and labor costs. It is recommended to obtain quotes from reputable automotive repair shops or dealerships for an accurate estimate of the repair cost.