U1120 code — how to fix error fast

Problem code U1120 of your car’s OBD2 diagnostic system can be more dangerous than it may seem, and if you retrieved this code during a diagnostic scan, you’ll need to take prompt action. The consequences of this code can be pretty dire, so if you don’t understand the U1120 code meaning, it could lead to serious issues with the vehicle’s driving safety systems.

Don’t worry, though – not everything is as dark as it seems and you’ll have a chance to repair the code on time and therefore prevent dealing with the issues that have to do with its aftermath. Our team will help you with that through this guide on code U1120’s main causes, prevention measures, and solutions.

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What does the U1120 code mean?

The U1120 code stands for “Lost Wheel Distance Message.” This code affects the Anti-lock Brake System (ABS) and Electronic Stability Control (ESC) systems in a vehicle. When the ABS and ESC systems receive incorrect or no messages from the wheel speed sensors, the U1120 code is triggered.

This code can cause a range of symptoms, including the ABS and ESC warning lights coming on, harsh shifting, and reduced fuel efficiency.

What causes the U1120 code?

There’s a variety of different causes of the code U1120 and if you approach it assuming it’s only due to the faulty wheel sensor, you may not apply an appropriate solution. So, here’s a complete list of the possible causes of this code with a description of each:

Faulty wheel speed sensor

A faulty or damaged wheel speed sensor is one of the most common causes of the U1120 code. The sensor may have a broken wire, a damaged connector, or a malfunctioning internal circuit. Without accurate data from the wheel speed sensor, the ABS and ESC systems won’t function correctly.

Damaged wiring or connectors

Damaged wiring or connectors in the ABS or ESC circuit can cause the U1120 code. Corrosion, wear, and tear, or exposure to heat and moisture can damage the wires and connectors, leading to communication errors between the modules.

Failed ABS or ESC module

If the ABS or ESC module fails, it can cause the U1120 code. A failed module may not receive or send the correct signals, leading to a loss of communication between the systems.

Malfunctioning powertrain control module (PCM)

If the Powertrain Control Module (PCM) malfunctions, it can cause the U1120 code. The PCM is responsible for monitoring the ABS and ESC systems, and any malfunction can affect the communication between the modules.

Which car models does the U1120 code affect the most?

The U1120 code can affect various car models, but some are more prone to this issue than others. We’ve done some digging through the driver complaints and NHTSA reports, so here are some car models that are most likely to be affected by the U1120 code:

• Dodge Caliber: This model has been known to exhibit U1120 codes due to issues with the ABS module.
• Jeep Compass: Some Jeep Compass owners have reported U1120 codes caused by faulty ABS modules or wiring issues.
• Chrysler Sebring: ertain model years of the Chrysler Sebring have been affected by U1120 codes due to problems with the ABS control module.

How to diagnose the U1120 code

If your car’s check engine light comes on and you suspect this code, you can diagnose the issue using several methods. Here are some steps to follow when diagnosing:

Use an OBD2 scanner

Using a diagnostic scanner is the most common and efficient way to diagnose this code. A scanner can read the codes stored in the car’s computer and provide information about the potential causes of the code. It’s essential to use a scanner that’s compatible with your car’s make and model.

Check the wiring and connectors

Inspecting the wiring and connectors in the ABS and ESC circuits can help identify any damages or corrosion that may be causing the code. It’s essential to check the wiring and connectors thoroughly, as even a small amount of damage can cause communication errors.

Perform a visual inspection

A visual inspection of the wheel speed sensors can help identify any visible damages or broken wires. You’ll need to remove the wheels and inspect the sensors closely to look for any damages.

How to fix the U1120 code

Fixing depends on the root cause of the issue. Here are some potential fixes for each cause of the code:

Replace the wheel speed sensor

If the wheel speed sensor is faulty or damaged, you’ll need to replace it. This can be a straightforward fix, but it may require some specialized tools and knowledge.

Repair the wiring or connectors

If the wiring or connectors are damaged, you’ll need to repair or replace them. This can be a more complicated fix, depending on the severity of the damage.

Replace the ABS or ESC module

If the ABS or ESC module is failed, you’ll need to replace it. This can be a more expensive fix, but it’s essential to ensure the safety and performance of your car.

Repair or replace the PCM

If the PCM is malfunctioning, you’ll need to repair or replace it. This can be a more complicated and expensive fix, but it’s crucial to ensure the proper functioning of your car.

It’s also important to note that fixing the code may require a professional mechanic’s help, especially for more complicated fixes like replacing the ABS or ESC module or repairing the PCM.

How to prevent the U1120 code

Preventing the U1120 code involves proper maintenance of your car’s systems. Here are some preventative measures you can take:

• Regularly inspect the wheel speed sensors and wiring for damages
• Keep the ABS and ESC circuits clean and free of corrosion
• Follow the manufacturer’s recommended maintenance schedule for your car’s systems
• Avoid driving on rough or uneven surfaces that can damage the wheel speed sensors

By following these preventative measures, you can reduce the likelihood of developing the code and ensure the proper functioning of your car’s systems

Our take

Ultimately, the code U1120 isn’t as bad for your car’s engine or transmission as some other OBD2 codes, but that doesn’t make it any less serious. If you don’t want to deal with ABS or ESC-related issues, fixing the code by addressing its root cause is the best way to go about it.

Hopefully, this guide has given you a complete picture of the code and its implications, so you can now proceed with a proper solution.