AutoCodes – Generic – U11CB

U11CB Code - Lost Left Rear Wheel Speed Message

Quick Answer

This diagnostic checks the availability of the left rear wheel speed signal which is sent by the Electronic Stability Program (ESP) via a Controller Area Network (CAN) message. Common causes include Faulty Powertrain Control Module (PCM), Faulty Anti-Lock Brake System (ABS) Module. 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: U11CB indicates Lost Left Rear Wheel Speed Message.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Faulty Anti-Lock Brake System (ABS) Module.
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 1,093

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 U11CB Description

This diagnostic checks the availability of the left rear wheel speed signal which is sent by the Electronic Stability Program (ESP) via a Controller Area Network (CAN) message. The diagnostic checks the availability by checking the valid bit. When the signal is not available, the ESP sends a Signal Not Available (SNA) default value to the Transmission Control Module (TCM). If the TCM reads this value then the Diagnostic Trouble Code (DTC) U11CB is set.

OBDII Code U11CB - Lost Left Rear Wheel Speed Message - AutoCodes.com — U11CB Code - Lost Left Rear Wheel Speed Message

What does this mean?

What are the Possible Causes of the DTC U11CB?

Faulty Powertrain Control Module (PCM)
Faulty Anti-Lock Brake System (ABS) Module

How to Fix the DTC U11CB?

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 U11CB 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 U11CB code?

Need more information on how to fix the U11CB code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U11CB code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U11CB Chrysler — Lost Left Rear Wheel Speed Message
U11CB Dodge — Lost Left Rear Wheel Speed Message
U11CB Jeep — Lost Left Rear Wheel Speed Message
U11CB RAM — Lost Left Rear Wheel Speed Message

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 U11CB Code

1. What are the common symptoms of OBDII code U11CB (Lost Left Rear Wheel Speed Message)?

- Common symptoms include traction control and stability control system malfunctions, ABS warning light illumination, and erratic speedometer readings.

2. What are the possible causes of OBDII code U11CB?

- Possible causes include damaged wheel speed sensor, wiring issues, faulty ABS module, or problems with the CAN bus communication system.

3. How can I diagnose the cause of OBDII code U11CB?

- To diagnose the issue, you can start by inspecting the left rear wheel speed sensor and its wiring for any damage or disconnection. You can also use a diagnostic scanner to check for any other related trouble codes.

4. Can I still drive my vehicle with OBDII code U11CB?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of important safety systems like ABS and traction control.

5. How can I repair OBDII code U11CB?

- The repair process may involve replacing the left rear wheel speed sensor, repairing any damaged wiring, or addressing issues with the ABS module or CAN bus system. It is recommended to consult a professional mechanic for an accurate diagnosis and repair.

6. Will resetting the trouble codes make OBDII code U11CB disappear?

- Resetting the codes may temporarily clear the warning lights, but if the underlying issue causing code U11CB is not fixed, the code is likely to reappear once the system detects the problem again.

7. Are there any DIY tips for troubleshooting OBDII code U11CB?

- DIY tips may include visually inspecting the sensor and wiring for any visible damage, checking the connectors for corrosion, and ensuring all connections are secure. However, for a thorough diagnosis and repair, it is best to seek professional help.

8. How critical is it to address OBDII code U11CB promptly?

- It is crucial to address code U11CB promptly, as it indicates a potential issue with the vehicle's safety systems. Ignoring the code can lead to unsafe driving conditions and potential loss of control while on the road.

9. Can extreme weather conditions affect OBDII code U11CB?

- Extreme weather conditions can potentially exacerbate existing issues related to wheel speed sensors or wiring, leading to the triggering of code U11CB. It is essential to keep the vehicle well-maintained, especially in harsh weather environments.

10. Is it necessary to visit a dealership for repairs related to OBDII code U11CB?

- While dealerships can provide specialized expertise in dealing with OBDII codes, independent mechanics with experience in diagnosing and repairing ABS and traction control systems can also effectively address the issue related to code U11CB.