AutoCodes – Chevrolet – U0400 Chevrolet

U0400 Chevrolet Code - Invalid Data Received

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 Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U0400 Chevrolet indicates Invalid Data Received.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 3,100

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 U0400 Chevrolet 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 Engine Control Module (ECM) causing its integrity to be questioned.

OBDII Code U0400 Chevrolet - Invalid Data Received - AutoCodes.com — U0400 Chevrolet Code - Invalid Data Received

What does this mean?

What are the Possible Causes of the DTC U0400 Chevrolet?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Engine Control Module (ECM) not configured

How to Fix the DTC U0400 Chevrolet?

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 U0400 Chevrolet 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 U0400 Chevrolet code?

Need more information on how to fix the U0400 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0400 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 U0400 Chevrolet Code

1. What are the common symptoms of OBDII code U0400 on a Chevrolet?

- Common symptoms include issues with the vehicle's transmission, ABS system, or stability control, as well as warning lights on the dashboard.

2. What are some possible causes of the U0400 code on a Chevrolet?

- Possible causes include damaged wiring or connectors, a faulty control module, software glitches, or a communication error within the vehicle's network.

3. How can I diagnose the U0400 code on my Chevrolet?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the vehicle's wiring and connectors, and performing communication tests between control modules.

4. Can I continue driving my Chevrolet with the U0400 code present?

- It is not recommended to continue driving the vehicle with the U0400 code present, as it can lead to potential safety issues and further damage to the vehicle's systems.

5. How can I repair the U0400 code on my Chevrolet?

- Repair options may include repairing or replacing damaged wiring, fixing faulty connectors, updating software, or replacing a malfunctioning control module.

6. Is it possible to clear the U0400 code on a Chevrolet without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the underlying problem causing the U0400 code to prevent it from reoccurring.

7. Can a DIY enthusiast fix the U0400 code on a Chevrolet?

- Depending on the specific cause of the U0400 code, some DIY enthusiasts may be able to address the issue by inspecting wiring, connectors, and performing basic diagnostic steps. However, more complex issues may require professional assistance.

8. How long does it typically take to repair the U0400 code on a Chevrolet?

- The repair time can vary depending on the cause of the code and the complexity of the repair. It may range from a few hours to a full day, especially if software updates or control module replacements are necessary.

9. Are there any preventive measures to avoid the U0400 code on a Chevrolet?

- Keeping up with regular vehicle maintenance, such as checking wiring integrity and connectors, can help prevent issues that may lead to the U0400 code.

10. Can a local auto shop or dealership assist with the U0400 code on my Chevrolet?

- Yes, local auto shops or Chevrolet dealerships have the expertise and diagnostic tools to diagnose and repair the U0400 code efficiently and effectively.