AutoCodes – Chrysler – U040F Chrysler

U040F Chrysler Code - Invalid Data Received From Reductant Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Reductant Control Module, Reductant Control Module harness is open or shorted, Reductant Control Module 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: U040F Chrysler indicates Invalid Data Received From Reductant Control Module.
Common causes: Common causes include Faulty Reductant Control Module, Reductant Control Module harness is open or shorted, Reductant Control Module 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 802

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 Apr 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U040F Chrysler Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Reductant Control Module causing its integrity to be questioned.

OBDII Code U040F Chrysler - Invalid Data Received From Reductant Control Module - AutoCodes.com — U040F Chrysler Code - Invalid Data Received From Reductant Control Module

What does this mean?

What are the Possible Causes of the DTC U040F Chrysler?

Faulty Reductant Control Module
Reductant Control Module harness is open or shorted
Reductant Control Module circuit poor electrical connection

How to Fix the DTC U040F 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 U040F 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 U040F Chrysler Code

1. What does the OBDII code U040F mean on a Chrysler vehicle?

The code U040F indicates "Invalid Data Received From Reductant Control Module," meaning the engine control module (ECM) detected inconsistent or corrupt data from the reductant control module.

2. What are common symptoms of the U040F code?

Symptoms may include the check engine light turning on, reduced engine performance, poor fuel efficiency, or issues with the diesel exhaust fluid (DEF) system.

3. What causes the U040F code to appear?

Common causes include a faulty reductant control module, wiring or connector issues in the DEF system, software glitches, or communication errors on the CAN bus.

4. Can a bad reductant control module trigger the U040F code?

Yes, a malfunctioning reductant control module can send invalid or corrupted data to the ECM, triggering the U040F code.

5. How do I diagnose the U040F code on a Chrysler?

Start by scanning for additional codes, inspecting the wiring and connectors of the reductant control module, and checking for software updates or communication errors using an advanced scan tool.

6. Can a software update fix the U040F code?

In some cases, a software update for the engine control module or reductant control module may resolve communication issues and clear the code.

7. Is it safe to drive with the U040F code active?

Driving with the U040F code may lead to reduced engine performance and could cause long-term damage to the DEF system or emissions components. It's best to address the issue promptly.

8. How much does it cost to fix the U040F code?

Repair costs can vary, but diagnosing and fixing wiring issues may cost $100â€“$300, while replacing the reductant control module could cost $500â€“$1,000 or more, depending on the vehicle model.

9. Can a bad DEF pump cause the U040F code?

While a bad DEF pump is not the direct cause, related issues in the DEF system, such as pump failure, can contribute to communication errors that trigger the code.

10. Do I need a professional mechanic to fix the U040F code?

While some basic checks like inspecting wiring can be done at home, diagnosing and repairing this code often requires advanced tools and expertise, so consulting a professional is recommended.