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U1120 RAM Code - Lost Wheel Distance Message

Quick Answer

The U1120 RAM diagnostic trouble code (DTC) specifically refers to a "Lost Wheel Distance Message." This code indicates that there is a communication issue between the vehicle's electronic control modules (ECMs) and the wheel speed sensors. Common causes include Damaged wheel speed sensors, Corroded sensor connections, Faulty wiring harnesses. 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 Damaged wheel speed sensors, Corroded sensor connections, Faulty wiring harnesses.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2024
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Code U1120 RAM Description

The U1120 RAM diagnostic trouble code (DTC) specifically refers to a "Lost Wheel Distance Message." This code indicates that there is a communication issue between the vehicle's electronic control modules (ECMs) and the wheel speed sensors. In modern vehicles, wheel speed sensors play a crucial role in the operation of various safety systems such as anti-lock braking systems (ABS), traction control systems (TCS), and stability control systems. These sensors provide real-time data on the speed of each wheel to the ECMs, allowing them to make adjustments to ensure optimal vehicle performance and safety.

OBDII Code U1120 RAM - Lost Wheel Distance Message
U1120 RAM Code - Lost Wheel Distance Message

Common Causes of U1120 RAM

  1. Damaged wheel speed sensors.
  2. Corroded sensor connections.
  3. Faulty wiring harnesses.
  4. ECM software glitches.
  5. Water intrusion in sensor connectors.

Symptoms of U1120 RAM

  1. ABS warning light illuminated on the dashboard.
  2. Traction control light activated.
  3. Inaccurate speedometer readings.
  4. Increased stopping distances during braking.
  5. Loss of stability control on slippery roads.

How to Fix U1120 RAM

  1. Perform a diagnostic scan to retrieve the specific trouble codes and pinpoint the issue.
  2. Inspect the wheel speed sensors and wiring harnesses for damage or corrosion.
  3. Clean or replace sensor connections as needed.
  4. Test the ECMs for proper communication with the wheel speed sensors.
  5. Reset the ECMs and clear the trouble codes to see if the issue is resolved.

Cost to Fix U1120 RAM

The typical repair costs for addressing a U1120 RAM code can vary depending on the specific cause of the issue. In general, replacing a wheel speed sensor can cost between $100 and $200 per sensor, including parts and labor. If the issue is related to wiring harnesses or ECM malfunctions, the repair costs may increase accordingly. Additionally, diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. It's advisable to consult with a qualified technician for a more accurate estimate based on the specific make and model of the vehicle.

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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.

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