AutoCodes – RAM – U1120 RAM

U1120 RAM Code - Lost Wheel Distance Message

Quick Answer

The Powertrain Control Module (PCM) receives the vehicle speed signal over the Controlled Area Network (CAN) C bus from the Anti-Lock Brake System (ABS) Module. Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) Module circuit poor electrical connection. 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: U1120 RAM indicates Lost Wheel Distance Message .
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) Module circuit poor electrical connection.
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 1,257

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1120 RAM Description

The Powertrain Control Module (PCM) receives the vehicle speed signal over the Controlled Area Network (CAN) C bus from the Anti-Lock Brake System (ABS) Module. The Diagnostic Trouble Code (DTC) sets when the PCM doesn't receive a vehicle speed signal from the Anti-Lock Brake System Module over the CAN C bus. One Trip fault.

OBDII Code U1120 RAM - Lost Wheel Distance Message - AutoCodes.com — U1120 RAM Code - Lost Wheel Distance Message

What does this mean?

What are the Possible Causes of the DTC U1120 RAM?

Faulty Anti-Lock Brake System (ABS) Module
Anti-Lock Brake System (ABS) Module harness is open or shorted
Anti-Lock Brake System (ABS) Module circuit poor electrical connection

How to Fix the DTC U1120 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 U1120 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.

Need more information about the U1120 RAM code?

Need more information on how to fix the U1120 RAM code? Get Access to Factory Service Manuals

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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 U1120 RAM Code

1. What does the OBDII code U1120 RAM Lost Wheel Distance Message mean?

The U1120 code indicates that the vehicle's communication system has lost the wheel distance message from the Anti-lock Braking System (ABS) module.

2. What are common symptoms of the U1120 code?

Common symptoms of the U1120 code include the ABS warning light illuminating on the dashboard, traction control issues, and potential loss of stability control.

3. What are possible causes of the U1120 code?

Possible causes of the U1120 code include damaged wheel speed sensors, faulty ABS module, wiring issues, or a communication error between the ABS module and other control modules.

4. How do you diagnose the U1120 code?

Diagnosing the U1120 code typically involves using a diagnostic scanner to retrieve the trouble codes, checking the ABS module and wheel speed sensors for any visible damage, and testing the communication between modules.

5. Can I still drive my vehicle with the U1120 code?

It is not recommended to drive the vehicle with the U1120 code present, as it can affect the operation of important safety systems like ABS and traction control.

6. How do you repair the U1120 code?

Repairing the U1120 code may involve replacing damaged wheel speed sensors, repairing any wiring issues, resetting the ABS module, or reprogramming the control modules to restore communication.

7. Are there any DIY tips to fix the U1120 code?

While some basic checks like inspecting the wheel speed sensors and wiring connections can be done DIY, diagnosing and repairing the U1120 code often requires specialized tools and expertise, so it's best to consult a professional mechanic.

8. Can the U1120 code be cleared/reset without fixing the underlying issue?

Clearing or resetting the U1120 code without addressing the underlying issue will only temporarily turn off the warning light, but the problem will likely reoccur until the root cause is fixed.

9. How much does it cost to repair the U1120 code?

The cost of repairing the U1120 code can vary depending on the specific cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It's recommended to get a diagnosis from a mechanic for an accurate estimate.

10. Is the U1120 code specific to certain RAM vehicles?

The U1120 code is specific to RAM vehicles, particularly those equipped with ABS and traction control systems. It may appear in various RAM models, including trucks and SUVs.