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U1140 Jeep Code - Lost Communication With Active Exhaust Valve 2

Quick Answer

The U1140 diagnostic trouble code for Jeep vehicles indicates that there is a communication issue with Active Exhaust Valve 2. Common causes include Faulty Active Exhaust Valve: The valve itself may be faulty and not responding to signals from the ECM, Wiring Issues: Problems with the wiring connecting the ECM to the Active Exhaust Valve can prevent proper communication, ECM Malfunction: A malfunctioning Engine Control Module can also lead to communication issues with the valve. 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
U1140 Jeep indicates Lost Communication With Active Exhaust Valve 2.
Common causes
Common causes include Faulty Active Exhaust Valve: The valve itself may be faulty and not responding to signals from the ECM, Wiring Issues: Problems with the wiring connecting the ECM to the Active Exhaust Valve can prevent proper communication, ECM Malfunction: A malfunctioning Engine Control Module can also lead to communication issues with the valve.
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 22, 2024
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Code U1140 Jeep Description

The U1140 diagnostic trouble code for Jeep vehicles indicates that there is a communication issue with Active Exhaust Valve 2. The Active Exhaust Valve is a component of the exhaust system that helps control the amount of exhaust flow and noise produced by the vehicle. When communication is lost with this valve, it can lead to various performance issues and potentially affect the overall functionality of the exhaust system.

OBDII Code U1140 Jeep - Lost Communication With Active Exhaust Valve 2
U1140 Jeep Code - Lost Communication With Active Exhaust Valve 2

Common Causes of U1140 Jeep

  1. Faulty Active Exhaust Valve: The valve itself may be faulty and not responding to signals from the ECM.
  2. Wiring Issues: Problems with the wiring connecting the ECM to the Active Exhaust Valve can prevent proper communication.
  3. ECM Malfunction: A malfunctioning Engine Control Module can also lead to communication issues with the valve.
  4. Corrosion or Contamination: Corrosion or contamination in the electrical connections can disrupt communication between components.

Symptoms of U1140 Jeep

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Decreased Performance: The vehicle may experience a decrease in performance, such as reduced acceleration or power output.
  3. Increased Exhaust Noise: A malfunctioning Active Exhaust Valve can lead to an increase in exhaust noise coming from the vehicle.
  4. Rough Idle: The engine may idle roughly or inconsistently when this code is present.

How to Fix U1140 Jeep

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific fault codes and pinpoint the exact cause of the communication loss.
  2. Inspect Wiring: Check the wiring harness for any damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  3. Test Active Exhaust Valve: Test the Active Exhaust Valve to ensure it is functioning properly. Replace the valve if necessary.
  4. Check ECM: Verify the functionality of the Engine Control Module and replace it if it is determined to be the cause of the communication issue.
  5. Clear Codes: Once the repair is complete, clear the fault codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U1140 Jeep

The cost of repairing a U1140 code for a Jeep vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to check with local auto repair shops for a more accurate estimate.

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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 U1140 Jeep Code

1. What are the common symptoms of OBDII code U1140 in a Jeep related to Lost Communication With Active Exhaust Valve 2?

- Common symptoms include illuminated check engine light, reduced engine performance, and possibly abnormal exhaust sounds.

2. What are some possible causes of the U1140 code in a Jeep?

- Possible causes include a faulty active exhaust valve, damaged wiring or connectors, a malfunctioning exhaust valve actuator, or a communication issue within the vehicle's network.

3. How can I diagnose the U1140 code related to Lost Communication With Active Exhaust Valve 2 in my Jeep?

- Diagnosing the issue may involve checking the exhaust valve and its components for proper function, inspecting wiring for damage, and using a diagnostic scan tool to analyze the communication network.

4. Can I drive my Jeep with the U1140 code present?

- It is generally not recommended to drive with the U1140 code present, as it can affect the engine's performance and cause further damage if left unresolved.

5. How can I repair the U1140 code in my Jeep?

- Repairing the U1140 code may involve fixing any wiring issues, replacing the active exhaust valve or its components, resetting the fault codes, and ensuring proper communication within the vehicle's system.

6. Is it safe to continue driving if the U1140 code disappears on its own?

- Even if the code disappears on its own, it is still advisable to have the vehicle inspected by a professional to prevent any potential issues from arising in the future.

7. Can a DIY enthusiast fix the U1140 code issue in a Jeep?

- Depending on the DIY enthusiast's skill level and access to tools, some simple repairs like checking wiring connections or replacing components may be possible. However, more complex diagnostics and repairs may require professional assistance.

8. How much does it typically cost to repair the U1140 code in a Jeep?

- The cost of repairing the U1140 code can vary depending on the specific issue causing the code, the parts needed for replacement, and labor costs. It is best to obtain a diagnosis from a mechanic for an accurate estimate.

9. Will resetting the check engine light resolve the U1140 code in my Jeep?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.

10. Are there any preventive maintenance tips to avoid encountering the U1140 code in a Jeep?

- Regularly inspecting the exhaust system, ensuring proper wiring connections, and following the manufacturer's maintenance schedule can help prevent issues that may trigger the U1140 code related to Lost Communication With Active Exhaust Valve 2.

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