AutoCodes – Chrysler – U1140 Chrysler

U1140 Chrysler 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 Chrysler 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 2,468

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

What does this mean?

What are the Possible Causes of the DTC U1140 Chrysler?

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 Chrysler?

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 Chrysler 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 Chrysler Code

1. What are the common symptoms of OBDII code U1140 Chrysler (Lost Communication With Active Exhaust Valve 2)?

- Common symptoms include issues with the active exhaust system functionality, decreased engine performance, and illuminated warning lights on the dashboard.

2. What are the potential causes of OBDII code U1140 Chrysler?

- The code U1140 Chrysler can be triggered by a faulty active exhaust valve 2, damaged wiring or connectors related to the valve, or a communication breakdown between the valve and the vehicle's ECM.

3. How can I diagnose the cause of OBDII code U1140 Chrysler?

- Diagnosis typically involves inspecting the active exhaust valve 2, checking the wiring and connectors for any damage, and using a diagnostic scanner to communicate with the ECM for further troubleshooting.

4. What are some repair tips for resolving OBDII code U1140 Chrysler?

- Repair tips may include repairing or replacing the faulty active exhaust valve 2, repairing any damaged wiring or connectors, and clearing the code with a diagnostic scanner after the repairs are completed.

5. Can driving with OBDII code U1140 Chrysler cause further damage to the vehicle?

- Continuing to drive with code U1140 Chrysler may lead to decreased fuel efficiency, engine performance issues, and potential damage to other components of the active exhaust system.

6. Is it safe to ignore OBDII code U1140 Chrysler?

- Ignoring the code may result in ongoing issues with the active exhaust system and could potentially cause damage to other engine components, so it is recommended to address the issue promptly.

7. How much does it typically cost to repair OBDII code U1140 Chrysler?

- The cost of repairing OBDII code U1140 Chrysler can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can I reset OBDII code U1140 Chrysler without fixing the underlying issue?

- While you can clear the code temporarily with a diagnostic scanner, it is important to address the underlying cause of the issue to prevent the code from reoccurring in the future.

9. Are there any preventive measures to avoid OBDII code U1140 Chrysler?

- Regular maintenance checks, including inspecting the active exhaust system components and wiring, can help prevent issues that may trigger code U1140 Chrysler.

10. How long does it typically take to repair OBDII code U1140 Chrysler?

- The repair time for OBDII code U1140 Chrysler can vary depending on the specific cause of the issue and the complexity of the repairs needed, but it may take a few hours to a full day to complete the repair process.