AutoCodes – Dodge – U1140 Dodge

U1140 Dodge Code - Lost Communication With Active Exhaust Valve 2

Quick Answer

The purpose of the Active Exhaust Valves is to reduce exhaust noise in order to comply with pass-by noise regulations. Common causes include Faulty Active Exhaust Valve Actuator, Active Exhaust Valve Actuator harness is open or shorted, Active Exhaust Valve Actuator 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: U1140 Dodge indicates Lost Communication With Active Exhaust Valve 2.
Common causes: Common causes include Faulty Active Exhaust Valve Actuator, Active Exhaust Valve Actuator harness is open or shorted, Active Exhaust Valve Actuator 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 6,954

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 Jul 02, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1140 Dodge Description

The purpose of the Active Exhaust Valves is to reduce exhaust noise in order to comply with pass-by noise regulations. The Active Exhaust Valves system consists of two main components. The first is the mechanical butterfly valves, which are welded into the exhaust pipe on each bank. Attached to each valve is a smart actuator. These are connected to the mechanical valves via a transmission spring to help reduce heat transfer from the butterfly valves to the actuators.
The Active Exhaust Valve actuators communicate with the Powertrain Control Module (PCM) over a LIN Bus circuit. Each Active Exhaust Valve actuator, one for the left (actuator 1) and one for the right (actuator 2), has a unique part number/internal ID. The PCM can identify each actuator's location by this unique ID. Based on engine torque, rpm, and vehicle speed, the PCM sends position commands to the Active Exhaust Valve actuators. These actuators then move the butterfly valves to the commanded positions. An internal Hall Effect sensor counts the pulses to determine the valve position. The valve actuators are calibrated at every Key-ON event; the PCM sends full open and full closed commands and checks the actual position against the commanded position. If calibration is unsuccessful for any reason, the actuators self-diagnose and report fault flags to the PCM over the LIN Bus.
If the valve position does not match the predetermined calibration, a performance code is set, and the valves will default to the full open position. If an actuator is not attached to the mechanical valve, or if the transmission spring is broken or missing, the actuator will continue to rotate indefinitely and set a fault. Additionally, if the mechanical valve is stuck and cannot move, a fault will be set.

OBDII Code U1140 Dodge - Lost Communication With Active Exhaust Valve 2 - AutoCodes.com — U1140 Dodge Code - Lost Communication With Active Exhaust Valve 2

What does this mean?

What are the Possible Causes of the DTC U1140 Dodge?

Faulty Active Exhaust Valve Actuator
Active Exhaust Valve Actuator harness is open or shorted
Active Exhaust Valve Actuator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1140 Dodge?

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 U1140 Dodge 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.

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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 Dodge Code

1. What are common symptoms of OBDII code U1140 in a Dodge indicating lost communication with active exhaust valve 2?

The common symptoms include poor engine performance, decreased fuel efficiency, and the active exhaust valve system not functioning properly.

2. What are some possible causes of OBDII code U1140 in a Dodge related to lost communication with active exhaust valve 2?

Potential causes include damaged wiring or connectors, a faulty exhaust valve actuator, a malfunctioning exhaust valve control module, or a communication error within the vehicle's network.

3. How can I diagnose the issue causing OBDII code U1140 in my Dodge with regards to lost communication with active exhaust valve 2?

Diagnosing the problem involves conducting a thorough inspection of the wiring and connectors, testing the exhaust valve actuator and control module, and using a diagnostic scanner to analyze the communication network for errors.

4. Can I continue driving my Dodge with OBDII code U1140 indicating lost communication with active exhaust valve 2?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the exhaust system and potentially impact engine performance.

5. What are the repair options for fixing OBDII code U1140 in a Dodge caused by lost communication with active exhaust valve 2?

Repair options may include repairing or replacing damaged wiring, connectors, the exhaust valve actuator, or the exhaust valve control module. It is advisable to consult a professional mechanic for an accurate diagnosis and repair.

6. How much does it typically cost to repair OBDII code U1140 in a Dodge related to lost communication with active exhaust valve 2?

The repair costs can vary depending on the specific cause of the issue and the extent of the repairs needed. Costs may range from a few hundred dollars to over a thousand dollars, including parts and labor.

7. Can a DIY enthusiast fix OBDII code U1140 in a Dodge caused by lost communication with active exhaust valve 2?

While some DIY enthusiasts may have the skills to diagnose and repair this issue, it is recommended to seek assistance from a professional mechanic due to the complexity of the exhaust system and electronic components involved.

8. How long does it typically take to repair OBDII code U1140 in a Dodge related to lost communication with active exhaust valve 2?

The repair time can vary based on the specific cause of the problem and the availability of parts. In general, the repair may take a few hours to a full day to complete.

9. Will resetting the OBDII code U1140 in my Dodge resolve the issue of lost communication with active exhaust valve 2?

Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the lost communication with the active exhaust valve 2. It is essential to address the root cause of the issue for a permanent solution.

10. Is OBDII code U1140 in a Dodge related to lost communication with active exhaust valve 2 a common issue?

While not as common as some other OBDII codes, issues with lost communication with active exhaust valves can occur in Dodge vehicles equipped with this system. Proper maintenance and timely repairs can help prevent such problems.