AutoCodes – RAM – U11CD RAM

U11CD RAM 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 RAM 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 848

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

What does this mean?

What are the Possible Causes of the DTC U11CD RAM?

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

How to Fix the DTC U11CD RAM?

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 RAM 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.

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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 RAM Code

1. What does the OBDII code U11CD mean?

The U11CD code indicates that the vehicle's control module has lost communication with the rear wheel speed sensors, meaning it is not receiving the expected messages.

2. What are the common symptoms of the U11CD code?

Symptoms can include the ABS and traction control warning lights illuminating, poor traction control performance, or inaccurate speed readings.

3. What causes the U11CD code to appear?

Common causes include damaged or disconnected rear wheel speed sensor wiring, faulty wheel speed sensors, or communication issues within the ABS module.

4. Can driving with the U11CD code cause further problems?

Yes, driving with this code may result in reduced safety features like ABS and traction control being disabled, increasing the risk of skidding or loss of traction.

5. How do I diagnose the U11CD code?

Start by checking the rear wheel speed sensor wiring and connectors for damage or corrosion. Use an OBDII scanner to verify the code and monitor the sensor's data.

6. How can I fix the U11CD code?

Repairs may include replacing damaged wiring, cleaning or reconnecting sensor connectors, or replacing a faulty wheel speed sensor.

7. Can a faulty ABS module cause the U11CD code?

Yes, a malfunctioning ABS module can disrupt communication with the rear wheel speed sensors and trigger this code.

8. Do I need special tools to fix the U11CD code?

An OBDII scanner is essential for diagnosing and clearing the code. Additional tools like a multimeter may be needed to check wiring and sensor functionality.

9. Is the U11CD code specific to RAM vehicles?

Yes, the U11CD code is commonly associated with RAM vehicles and their specific communication systems.

10. Can a software update fix the U11CD code?

In some cases, a software update to the vehicle's control modules may resolve communication issues causing the U11CD code. Check with your dealership for updates.