AutoCodes – Chrysler – U11C9 Chrysler

U11C9 Chrysler 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 Chrysler 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 521
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on May 03, 2020
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Code U11C9 Chrysler 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 Chrysler - Lost Left Front Wheel Speed Message - AutoCodes.com
U11C9 Chrysler Code - Lost Left Front Wheel Speed Message

What are the Possible Causes of the DTC U11C9 Chrysler?

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

How to Fix the DTC U11C9 Chrysler?

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 Chrysler 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 Chrysler Code

What does the OBDII code U11C9 mean for Chrysler vehicles?

The code U11C9 indicates a "Lost Left Front Wheel Speed Message," which means the vehicle's computer is not receiving a signal from the left front wheel speed sensor.

What are the common symptoms associated with the U11C9 code?

Common symptoms include the ABS warning light illuminating, traction control issues, and erratic speedometer readings.

What could cause the U11C9 code to trigger?

Possible causes include a faulty left front wheel speed sensor, damaged wiring or connectors, or issues with the ABS control module.

How can I diagnose the U11C9 code?

Start by using an OBDII scanner to confirm the code, then inspect the left front wheel speed sensor, wiring, and connectors for any visible damage or disconnection.

What repairs are typically needed to fix the U11C9 code?

Repairs may involve replacing the left front wheel speed sensor, repairing damaged wiring, or addressing issues with the ABS control module.

Can I drive my vehicle with the U11C9 code?

While it may be possible to drive the vehicle, it is recommended to address the issue promptly, as it can affect braking performance and traction control.

How do I reset the U11C9 code after repairs?

You can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a short period, but ensure the underlying issue is resolved first.

Is the U11C9 code related to the ABS system?

Yes, the U11C9 code is directly related to the ABS system, as it indicates a problem with the wheel speed sensor that the ABS relies on for proper operation.

What is the approximate cost to repair the U11C9 issue?

Repair costs can vary widely but may range from $100 to $400, depending on whether you need to replace a sensor, repair wiring, or service the ABS module.

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