AutoCodes – Generic – U113F

U113F Code - Lost Communication With Active Exhaust Valve 1

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: U113F indicates Lost Communication With Active Exhaust Valve 1.
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 11,243

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 U113F 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 U113F - Lost Communication With Active Exhaust Valve 1 - AutoCodes.com — U113F Code - Lost Communication With Active Exhaust Valve 1

What does this mean?

What are the Possible Causes of the DTC U113F?

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 U113F?

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 U113F 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.

Need more information about the U113F code?

Need more information on how to fix the U113F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U113F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U113F Chrysler — Lost Communication With Active Exhaust Valve 1
U113F Dodge — Lost Communication With Active Exhaust Valve 1
U113F Jeep — Lost Communication With Active Exhaust Valve 1
U113F RAM — Lost Communication With Active Exhaust Valve 1

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 U113F Code

1. What are the common symptoms of OBDII code U113F - Lost Communication With Active Exhaust Valve 1?

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

2. What are the possible causes of code U113F being triggered?

Possible causes of this code include a faulty active exhaust valve, damaged wiring or connectors, a malfunctioning control module, or a communication error within the system.

3. How can I diagnose the issue related to code U113F?

Diagnosing the problem typically involves inspecting the active exhaust valve, checking the wiring and connectors for any damage, and using a diagnostic tool to communicate with the control module.

4. Can I still drive my vehicle with the U113F code present?

It is generally not recommended to drive the vehicle with the U113F code active, as it can lead to further damage to the exhaust system and impact the overall performance of the vehicle.

5. How can I repair OBDII code U113F at home?

Repairing this code may involve replacing the faulty active exhaust valve, repairing any damaged wiring or connectors, or resetting the control module. It is recommended to consult a professional if you are not familiar with these procedures.

6. Is it possible to reset the U113F code without fixing the underlying issue?

While you can clear the code using an OBDII scanner, the issue causing the code will likely persist unless properly addressed. Clearing the code without fixing the problem may lead to recurring issues.

7. How much does it typically cost to repair OBDII code U113F?

The cost of repairing this code can vary depending on the specific issue causing it, the parts needed for replacement, and the labor charges. It is advisable to obtain quotes from different mechanics for an accurate estimate.

8. Will the U113F code cause my vehicle to fail emissions tests?

If the active exhaust system is not functioning properly due to this code, it can potentially cause the vehicle to fail emissions tests. It is important to address the issue before undergoing emission testing.

9. Can extreme weather conditions trigger the U113F code?

Extreme weather conditions such as excessive heat or moisture can sometimes affect the active exhaust system and trigger the U113F code. Ensuring proper maintenance and protection against the elements can help prevent such issues.

10. How long does it typically take to repair the U113F code?

The repair time for this code can vary depending on the extent of the issue and the availability of parts. Simple repairs may take a few hours, while more complex issues could require a day or more to resolve.