AutoCodes – RAM – U11C9 RAM

U11C9 RAM Code - Lost Left Front Wheel Speed Message

Quick Answer

This diagnostic checks the availability of the left front 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: U11C9 RAM indicates Lost Left Front 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 489

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 U11C9 RAM Description

This diagnostic checks the availability of the left front 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. The Diagnostic Trouble Code (DTC) sets when the read value does not match the written value in any RAM location.

OBDII Code U11C9 RAM - Lost Left Front Wheel Speed Message - AutoCodes.com — U11C9 RAM Code - Lost Left Front Wheel Speed Message

What does this mean?

What are the Possible Causes of the DTC U11C9 RAM?

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

How to Fix the DTC U11C9 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 U11C9 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 U11C9 RAM Code

1. What are the common symptoms of the U11C9 OBDII code related to the Lost Left Front Wheel Speed Message?

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

2. What could cause the U11C9 code to trigger the Lost Left Front Wheel Speed Message?

- Possible causes include a faulty wheel speed sensor on the left front wheel, damaged wiring harness, or a problem with the ABS module.

3. How can I diagnose the U11C9 code for the Lost Left Front Wheel Speed Message?

- Diagnose by checking the left front wheel speed sensor for proper connection and functionality, inspecting the wiring for damage, and using a scan tool to read ABS module data.

4. Can I drive my vehicle with the U11C9 code indicating a Lost Left Front Wheel Speed Message?

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

5. What are the repair options for fixing the U11C9 OBDII code related to the Lost Left Front Wheel Speed Message?

- Repair options include replacing the left front wheel speed sensor, repairing or replacing damaged wiring, and reprogramming or replacing the ABS module if necessary.

6. How much does it typically cost to repair the U11C9 code for the Lost Left Front Wheel Speed Message?

- Repair costs can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any preventive measures to avoid the U11C9 code from reoccurring?

- Regularly inspecting the wheel speed sensors and wiring harness for damage, and addressing any ABS system warnings promptly can help prevent the code from reoccurring.

8. Can weather conditions affect the triggering of the U11C9 code?

- Yes, extreme weather conditions or driving through deep water can potentially damage the wheel speed sensor or wiring, leading to the U11C9 code.

9. Is it possible to reset the U11C9 code for the Lost Left Front Wheel Speed Message without making repairs?

- While clearing the code with a scan tool is possible, it is not recommended as the underlying issue causing the code will persist and may affect the vehicle's safety systems.

10. How urgent is it to address the U11C9 code related to the Lost Left Front Wheel Speed Message?

- It is important to address this code promptly to ensure the proper functioning of the ABS and stability control systems, which are crucial for safe driving.