AutoCodes – RAM – U11CB RAM

U11CB RAM 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 RAM 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 508

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

What does this mean?

What are the Possible Causes of the DTC U11CB RAM?

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

How to Fix the DTC U11CB 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 U11CB 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 U11CB RAM Code

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

- Common symptoms include traction control or stability control malfunctions, ABS warning lights, and erratic speedometer readings.

2. What can cause the OBDII code U11CB RAM to trigger?

- The code can trigger due to issues with the left rear wheel speed sensor, damaged sensor wiring, or faults in the vehicle's electronic control module.

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

- Diagnose the code by checking the left rear wheel speed sensor for damage, testing the sensor's wiring for continuity, and using a diagnostic scan tool to monitor sensor readings.

4. What repairs are typically needed to address the Lost Left Rear Wheel Speed Message code?

- Repairs may involve replacing the left rear wheel speed sensor, repairing or replacing damaged sensor wiring, or reprogramming the electronic control module.

5. Can I drive my vehicle with the U11CB RAM code present?

- It is not recommended to drive the vehicle with the code active, as it may affect the vehicle's stability control and ABS systems, compromising safety.

6. How much does it cost to repair the U11CB RAM code?

- Repair costs can vary depending on the specific issue causing the code, but replacing a wheel speed sensor or repairing wiring typically ranges from $100 to $300.

7. Can I clear the U11CB RAM code with an OBDII scanner?

- Clearing the code with an OBDII scanner is possible, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. How long does it take to repair the Lost Left Rear Wheel Speed Message code?

- The repair time can vary based on the extent of the issue, but a skilled mechanic can typically address the problem within a few hours.

9. Are there any DIY tips for troubleshooting the U11CB RAM code?

- DIY tips include visually inspecting the left rear wheel speed sensor and its wiring for damage, checking for loose connections, and ensuring proper sensor alignment.

10. Will the U11CB RAM code cause my vehicle to fail an emissions test?

- The code itself may not directly impact emissions, but it is important to address the underlying issue to ensure the vehicle operates correctly and passes all necessary tests.