U1120 Code Jeep: Meaning, Causes, Symptoms & Fix

The U1120 code in a Jeep means that the ABS module is not receiving a signal from the speed sensor. To fix this, you can try cleaning the ABS module with an electrical cleaner and clearing the code.

If that doesn’t work, it may be a problem with the pump module or the speed sensor. When the U1120 code appears on a Jeep, it indicates a communication issue between the ABS module and the speed sensor.

This can be resolved by cleaning the ABS module with an electrical cleaner and clearing the code.

If the problem persists, it may be necessary to inspect the pump module or the speed sensor.

Understanding The U1120 Code

The U1120 code in a Jeep indicates a problem with the Anti-Lock Brake System (ABS) module.

It means that the ABS module is not communicating with the speed sensor, which can cause issues with the braking system.

Possible fixes include cleaning the ABS module or replacing the pump module or speed sensor.

Definition And Meaning Of The U1120 Code:

• The U1120 code is a diagnostic trouble code (DTC) that indicates a communication problem between the vehicle’s engine control module (ECM) and the anti-lock brake system (ABS) module.
• The code specifically refers to a loss of communication with the vehicle speed signal over the CAN C bus.
• When the PCM does not receive a vehicle speed signal from the ABS module, it triggers the U1120 code.

How The U1120 Code Affects The Anti-Lock Brake System (Abs) Module:

• The U1120 code affects the ABS module’s ability to communicate with the rest of the vehicle’s systems, particularly the ECM.
• The ABS module plays a crucial role in maintaining the proper functioning of the anti-lock braking system, which is designed to prevent wheel lock-up during braking.
• When the U1120 code is present, it means that the ABS module is unable to send or receive necessary signals related to vehicle speed, potentially compromising the ABS system’s effectiveness.

Importance Of Addressing The U1120 Code In A Timely Manner:

• It is crucial to address the U1120 code promptly to ensure the proper functioning of the vehicle’s anti-lock brake system.
• Ignoring the code can lead to decreased braking performance, particularly in slippery road conditions or emergency situations.
• Fixing the issue promptly can help prevent accidents and ensure the safety of the vehicle’s occupants and other road users.
• It is recommended to have the vehicle diagnosed and repaired by a qualified technician to identify and resolve the underlying cause of the U1120 code, restoring the ABS module’s communication capabilities.

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Causes Of The U1120 Code

The U1120 code in a Jeep indicates a problem with the Anti-Lock Brake System (ABS) module. Possible causes include an open or shorted harness, poor circuitry, or a faulty ABS module.

If cleaning the module doesn’t work, it may be necessary to replace the pump module or speed sensor.

Faulty Anti-Lock Brake System (Abs) Module:

• The Anti-Lock Brake System (ABS) Module may be faulty, causing the U1120 code to appear.
• This module is responsible for managing the anti-lock braking system, ensuring the wheels don’t lock up during braking.
• If the module is not functioning properly, it may fail to communicate with other essential components, resulting in the U1120 code.

Open Or Shorted Harness Of The Abs Module:

• An open or shorted harness of the ABS Module can also trigger the U1120 code.
• A harness is a collection of wires that connects various electrical components.
• If the harness connected to the ABS Module is damaged, frayed, or disconnected, it can disrupt the communication between the module and other parts of the vehicle.

Poor Circuit Connection Of The Abs Module:

• Poor circuit connection between the ABS Module and other components can lead to the U1120 code.
• The circuit connection allows the flow of electric current between different parts of the system.
• If there is corrosion, loose connections, or damaged wires affecting the circuit connection of the ABS Module, it can result in communication errors and trigger the U1120 code.

Loss Of Communication Between The Pcm And Abs Module:

• Loss of communication between the Powertrain Control Module (PCM) and the ABS Module can cause the U1120 code.
• The PCM is responsible for managing and controlling various functions of the vehicle.
• If there is a failure in communication between the PCM and the ABS Module, the PCM may not receive accurate information regarding the vehicle’s speed, triggering the U1120 code.

Remember, if your Jeep is displaying the U1120 code, it is essential to diagnose the exact cause before attempting any fixes.

Consulting a professional mechanic or using specialized diagnostic tools can help identify the source of the issue and ensure an accurate resolution.

Symptoms Of The U1120 Code

The U1120 code in Jeep vehicles refers to a communication failure between the Anti-Lock Brake System (ABS) module and the vehicle’s speed sensor. This can result in a malfunction of the ABS system.

To fix this issue, you can try cleaning the ABS module or replacing the pump module or speed sensor if necessary.

When it comes to diagnosing the U1120 code in your Jeep, there are several symptoms to look out for.

These symptoms can indicate an issue with the Anti-Lock Brake System (ABS) module and should not be ignored.

Here are the common signs that you may experience if your Jeep has the U1120 code:

• Absence of vehicle speed signal from ABS Module:
• The PCM (Powertrain Control Module) doesn’t receive a vehicle speed signal from the ABS module over the CAN C bus.
• Possible causes: CAN C bus communication failure, faulty ABS module, or a problem with the wiring between the ABS module and the PCM.
• Unresponsive or malfunctioning ABS system:
• The ABS system may become unresponsive or malfunctioning due to the U1120 code.
• You may notice that the ABS warning light on the instrument panel stays illuminated, indicating a problem with the ABS system.
• The ABS system may fail to activate properly, causing decreased braking efficiency and potentially compromising your safety on the road.
• Warning lights on the instrument panel:
• In addition to the ABS warning light, you may also notice other warning lights on the instrument panel, such as the check engine light or the traction control light.
• These warning lights indicate that there is a problem with the vehicle’s systems and should be addressed immediately.
• Decreased braking efficiency:
• One of the most noticeable symptoms of the U1120 code is decreased braking efficiency.
• You may experience longer stopping distances or a spongy brake pedal, which can make it harder to control your vehicle.
• It is crucial to address this issue promptly to ensure your safety and the safety of others on the road.

If you experience any of these symptoms, it is essential to get your Jeep diagnosed and repaired as soon as possible.

Ignoring the U1120 code and its associated symptoms can lead to further damage to your vehicle and potentially dangerous situations on the road.

Diagnosing The U1120 Code

The U1120 code in a Jeep indicates a problem with the Anti-Lock Brake System (ABS) module.

This can result in a loss of communication between the ABS module and the vehicle speed sensor, causing symptoms such as a non-functional speedometer.

To fix this issue, it is recommended to clean the ABS module with an electrical cleaner or replace it if necessary.

When it comes to diagnosing the U1120 code in your Jeep, there are a few steps you can take to identify the cause of the issue.

In order to effectively diagnose the problem, it’s important to follow a systematic approach.

Here are three methods you can use:

Using OBD2 Scanner To Retrieve The U1120 Code

• Connect an OBD2 scanner to your vehicle’s diagnostic port, usually located under the dashboard.
• Retrieve the U1120 code from the scanner by following the manufacturer’s instructions.
• Write down the code and any additional information displayed by the scanner.

Conducting Visual Inspection Of Abs Module And Related Components

• Inspect the ABS module and its wiring harness for any visible signs of damage, such as frayed wires or loose connections.
• Check the fuse related to the ABS system to ensure it is not blown.
• Inspect the wheel speed sensors for any physical damage, such as dirt or debris.

Performing Electrical Tests To Identify The Cause Of The Code

• Use a multimeter to test the resistance of the wheel speed sensors. Each sensor should have a similar reading, indicating they are functioning properly.
• Check the wiring harness for continuity using a wiring diagram specific to your vehicle’s make and model.
• Test the ABS module for power and ground using a voltage meter.

Remember, it’s important to clear the U1120 code after each diagnosis step to see if it reappears.

If none of these methods yield any results, it may be necessary to seek professional assistance from a certified mechanic.

Fixing The U1120 Code

The U1120 code in a Jeep indicates a problem with the Anti-Lock Brake System (ABS) module. This can result in a loss of communication with the vehicle speed signal.

To fix this, you can try cleaning the ABS module with an electrical cleaner or check the pump module and speed sensor if cleaning doesn’t work.

Cleaning the ABS Module with electrical cleaner:

• Unplug and locate the ABS Module.
• Use an electrical cleaner to clean the ABS Module thoroughly.
• Ensure all connections are clean and free from debris.
• Reconnect the ABS Module and secure it properly.

Clearing the code and testing for reoccurrence:

• Use an OBD-II scanner to clear the U1120 code from the vehicle’s PCM.
• Take the vehicle for a test drive to check if the code reoccurs.
• Monitor the ABS system for any abnormal behavior or warning lights.

Replacing the ABS Module if cleaning does not work:

• If cleaning the ABS Module does not resolve the U1120 code, it may be necessary to replace the module.
• Consult the vehicle’s service manual or a professional mechanic for the correct replacement procedure.
• Ensure the new ABS Module is compatible with the vehicle’s make and model.

Checking and repairing any wiring or circuit issues:

• Inspect the wiring and circuits related to the ABS Module for any damage or loose connections.
• Repair or replace any damaged wiring or connectors.
• Ensure all connections are secure and properly insulated.

Verifying successful repair by retesting and clearing the code:

• After performing any repairs or replacing the ABS Module, retest the vehicle for the U1120 code.
• Use an OBD-II scanner to check for any stored codes in the PCM.
• Clear any remaining codes and verify that the U1120 code does not reappear.
• Monitor the ABS system for proper functionality and ensure there are no warning lights or abnormal behavior.

By following these steps, you can effectively diagnose and fix the U1120 code in your Jeep’s ABS system.

Remember to follow the recommended procedures and consult a professional if you are unsure or uncomfortable working on the ABS system yourself.

FAQs for U1120 Code Jeep

What Is The Code U1120 On A Durango?

The code U1120 on a Durango indicates a communication problem between the PCM and the ABS module regarding the vehicle speed signal. Possible causes include a faulty ABS module, wiring issues, or a faulty speed sensor. Try cleaning the ABS module and clearing the code, or consult a professional if the issue persists.

What Does The U1120 Code In A Jeep Mean?

The U1120 code in a Jeep indicates a problem with the anti-lock brake system. It usually means that there is a loss of communication between the vehicle speed sensor and the ABS module.

What Are The Causes Of The U1120 Code In A Jeep?

The causes of the U1120 code in a Jeep can include a faulty ABS module, an open or shorted harness in the ABS module circuit, or a poor connection in the circuit.

What Are The Symptoms Of The U1120 Code In A Jeep?

Common symptoms of the U1120 code in a Jeep can include an illuminated ABS warning light, a non-functioning ABS system, and a loss of traction control.

Conclusion

The U1120 code in a Jeep indicates a communication failure between the vehicle’s PCM and the ABS module.

This can lead to a loss of communication of the vehicle speed signal, causing various symptoms such as a malfunctioning ABS system, speedometer issues, and even a check engine light.

It is important to address this issue promptly to ensure the proper functioning of your vehicle’s braking system and overall safety.

To fix the U1120 code, you can try unplugging and cleaning the ABS module with an electrical cleaner.

If that does not resolve the issue, it may be necessary to replace the pump module or the speed sensor.

It is recommended to consult a professional mechanic or refer to the vehicle’s service manual to accurately diagnose and address the specific cause of the code.

Remember, proper maintenance and regular inspections are key to keeping your vehicle in optimal condition.

Addressing any issues promptly can prevent further damage and ensure your safety on the road.