AutoCodes – RAM – U0402 RAM

U0402 RAM 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 RAM 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 4,429

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 Aug 05, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0402 RAM 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 RAM - Invalid Data Received From Transmission Control Module - AutoCodes.com — U0402 RAM Code - Invalid Data Received From Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U0402 RAM?

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

How to Fix the DTC U0402 RAM?

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 RAM 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 RAM Code

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

- Common symptoms include transmission shifting issues, hesitation or jerking during acceleration, and the transmission going into limp mode.

2. What are the possible causes of the U0402 RAM code?

- The code U0402 can be triggered by issues such as a faulty transmission control module (TCM), wiring problems, software glitches, or a communication error between the TCM and other modules.

3. How can I diagnose the U0402 code related to the transmission control module?

- To diagnose the U0402 code, you can use a professional OBDII scanner to retrieve the specific details of the code and then perform a thorough inspection of the TCM, wiring connections, and related components.

4. What steps can I take to repair the U0402 code indicating invalid data from the TCM?

- Repairing the U0402 code may involve checking and repairing any damaged wiring, verifying the TCM connections, updating software if necessary, or replacing the TCM if it is found to be faulty.

5. Can I drive my vehicle with the U0402 code present?

- It is not recommended to drive your vehicle with the U0402 code present, as it can lead to potential transmission issues and further damage. It is advised to address the problem promptly.

6. How much does it typically cost to repair the U0402 code related to the transmission control module?

- The cost of repairing the U0402 code can vary depending on the specific cause of the issue. It may range from a simple wiring repair costing a few hundred dollars to TCM replacement, which could cost over a thousand dollars.

7. Are there any preventive maintenance tips to avoid triggering the U0402 code?

- Regularly checking and maintaining your vehicle's transmission system, ensuring proper electrical connections, and promptly addressing any warning signs can help prevent issues that may trigger the U0402 code.

8. Can a DIY enthusiast fix the U0402 code issue, or is it better left to professionals?

- While some DIY enthusiasts may have the skills to diagnose and repair the U0402 code, dealing with transmission control module issues can be complex. It is often recommended to seek professional help for accurate diagnosis and repair.

9. How long does it typically take to repair the U0402 code related to the TCM?

- The repair time for the U0402 code can vary based on the underlying cause and the extent of the issue. Simple fixes like wiring repairs may take a few hours, while TCM replacement could take longer.

10. Will resetting the OBDII code U0402 clear the issue permanently?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the U0402 code. It is crucial to diagnose and address the root cause to prevent the code from reoccurring.