AutoCodes – Chevrolet – U0402 Chevrolet

U0402 Chevrolet Code - Invalid Data Received From Transmission 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 Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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: U0402 Chevrolet indicates Invalid Data Received From Transmission Control Module.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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 5,873

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 U0402 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 Transmission Control Module (TCM) causing its integrity to be questioned.

OBDII Code U0402 Chevrolet - Invalid Data Received From Transmission Control Module - AutoCodes.com — U0402 Chevrolet Code - Invalid Data Received From Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U0402 Chevrolet?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U0402 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 U0402 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.

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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 U0402 Chevrolet Code

1. What are the common symptoms of OBDII code U0402 in a Chevrolet indicating "Invalid Data Received From Transmission Control Module"?

- Common symptoms include issues with shifting gears, transmission slipping, harsh shifting, and the transmission going into limp mode.

2. What are some possible causes of OBDII code U0402 in a Chevrolet?

- Possible causes include a faulty Transmission Control Module (TCM), damaged wiring or connectors, software glitches, or a communication error between modules.

3. How can I diagnose the OBDII code U0402 in my Chevrolet?

- Diagnosing U0402 involves using a diagnostic scanner to retrieve the code, checking for any related codes, inspecting wiring and connectors, and testing the TCM for proper functionality.

4. Can I still drive my Chevrolet with the U0402 code present?

- It is not recommended to drive the vehicle with the U0402 code as it can lead to further transmission issues and potential safety hazards. It's best to address the problem promptly.

5. What are some repair tips for fixing the U0402 code in a Chevrolet?

- Repair tips include checking and repairing any damaged wiring or connectors, updating the TCM software, replacing a faulty TCM, and ensuring all modules are communicating correctly.

6. Is it possible to reset the U0402 code in a Chevrolet without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent the code from reappearing and causing more severe transmission problems.

7. Will the U0402 code in a Chevrolet cause the Check Engine Light to illuminate?

- Yes, the U0402 code will trigger the Check Engine Light to turn on, indicating a problem with the transmission control module's communication.

8. Can a DIY enthusiast fix the U0402 code in a Chevrolet, or is professional help necessary?

- Depending on your experience and tools, some DIY enthusiasts may be able to address simpler causes like checking connections. However, complex issues may require professional diagnosis and repair.

9. How much does it typically cost to repair the U0402 code in a Chevrolet at a dealership or repair shop?

- Repair costs can vary based on the underlying issue causing the code. However, expect to pay for diagnostic time, parts replacement (if needed), and labor, which can range from a couple of hundred to over a thousand dollars.

10. Are there any preventive measures to avoid the U0402 code from appearing in a Chevrolet?

- Regularly maintaining your vehicle, avoiding water damage to electrical components, and promptly addressing any transmission-related issues can help prevent the U0402 code from appearing.