AutoCodes – Generic – U11CD

U11CD Code - Lost Both Rear Wheel Speed Message

Quick Answer

This diagnostic checks for the availability of both Rear Wheel Speed signals which are sent by the Anti-lock Braking System (ABS) 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: U11CD indicates Lost Both 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 1,640

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 U11CD Description

This diagnostic checks for the availability of both Rear Wheel Speed signals which are sent by the Anti-lock Braking System (ABS) via a Controller Area Network (CAN) message. The Transmission Control Module (TCM) uses this information to calculate the vehicle speed. The diagnostic determines the availability of both Rear Wheel Speed signals by checking the valid bit. When one of the signals is not available, the ABS sends a Signal Not Available (SNA) default value to the TCM. When both signals are equal to SNA default values then the Diagnostic Trouble Code (DTC) U11CD is set.

OBDII Code U11CD - Lost Both Rear Wheel Speed Message - AutoCodes.com — U11CD Code - Lost Both Rear Wheel Speed Message

What does this mean?

What are the Possible Causes of the DTC U11CD?

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

How to Fix the DTC U11CD?

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 U11CD 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 U11CD code?

Need more information on how to fix the U11CD code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U11CD code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U11CD Chrysler — Lost Both Rear Wheel Speed Message
U11CD Dodge — Lost Both Rear Wheel Speed Message
U11CD Jeep — Lost Both Rear Wheel Speed Message
U11CD RAM — Lost Both 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 U11CD Code

1. What are the common symptoms of OBDII code U11CD (Lost Both Rear Wheel Speed Message)?

- The common symptoms include ABS or traction control warning lights illuminated on the dashboard, loss of traction control functionality, and potential issues with the vehicle's stability control system.

2. What could cause the OBDII code U11CD to trigger?

- The code U11CD is triggered when the vehicle's onboard computer detects a communication issue with the rear wheel speed sensors, which could be caused by wiring faults, sensor malfunctions, or faulty control modules.

3. How can I diagnose the root cause of the U11CD code?

- Diagnosing the U11CD code typically involves inspecting the rear wheel speed sensor wiring and connections, testing the sensors for proper functionality, and checking the control modules for any faults or errors.

4. Can I still drive my vehicle with the U11CD code present?

- While it may be possible to drive the vehicle with the U11CD code triggered, it is not recommended as it may compromise the functionality of important safety features like ABS and traction control.

5. Are there any DIY repair tips for fixing the U11CD code?

- DIY repair tips may include checking and cleaning the rear wheel speed sensor connections, ensuring proper wiring integrity, and resetting the fault codes to see if the issue resolves temporarily.

6. How much does it typically cost to repair the U11CD code at a professional service center?

- The cost of repairing the U11CD code can vary depending on the root cause of the issue, but it may involve replacing faulty sensors, repairing damaged wiring, or reprogramming control modules, which could range from a few hundred to a few thousand dollars.

7. Can extreme weather conditions affect the occurrence of the U11CD code?

- Yes, extreme weather conditions such as heavy rain, snow, or road salt exposure can potentially impact the rear wheel speed sensors and their communication, leading to the triggering of the U11CD code.

8. Will the U11CD code reset itself after the issue is fixed?

- In some cases, once the underlying issue causing the U11CD code is resolved, the code may reset itself after a certain number of successful drive cycles without the issue reoccurring.

9. Is the U11CD code specific to a certain make or model of vehicle?

- The U11CD code is a generic OBDII code related to a lost rear wheel speed message and can potentially appear in various vehicle makes and models equipped with ABS and traction control systems.

10. How can I prevent the U11CD code from recurring in the future?

- Regular maintenance checks, ensuring proper wiring integrity, and promptly addressing any ABS or traction control system issues can help prevent the U11CD code from recurring in the future.