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U0101 Nissan Code - Lost Communication with Transmission Control Module

Quick Answer

The Controller Area Network (CAN) is a serial communication line for real-time applications. 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
U0101 Nissan indicates Lost Communication with 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 50,490
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Mar 23, 2023
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Code U0101 Nissan Description

The Controller Area Network (CAN) is a serial communication line for real-time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads the required data only.
If the Transmission Control Module (TCM) cannot communicate with the Engine Control Module (ECM), the TCM will conclude that there is a malfunction in the CAN system, illuminate the MIL, and set a Diagnostic Trouble Code (DTC).
OBDII Code U0101 Nissan - Lost Communication with Transmission Control Module - AutoCodes.com
U0101 Nissan Code - Lost Communication with Transmission Control Module
What does this mean?

What are the Possible Causes of the DTC U0101 Nissan?

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

How to Fix the DTC U0101 Nissan?

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 U0101 Nissan 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 U0101 Nissan code?

Need more information on how to fix the U0101 Nissan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0101 Nissan code diagnosed by a professional: Find a repair shop in your area

Information for Specific Nissan Models

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 U0101 Nissan Code

1. What are the common symptoms of OBDII code U0101 (Lost Communication with Transmission Control Module) in a Nissan vehicle?

The common symptoms include erratic shifting, transmission slipping, loss of power, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code U0101 in a Nissan?

The code U0101 can be caused by issues such as a faulty Transmission Control Module (TCM), damaged wiring or connectors, a defective CAN bus system, or a software problem.

3. How can I diagnose the cause of OBDII code U0101 in my Nissan?

Diagnosing the issue involves checking the TCM for power and ground, inspecting the wiring harness for damage, scanning for other related codes, and performing a communication test on the CAN bus system.

4. Can I continue driving my Nissan if OBDII code U0101 is present?

It is not recommended to continue driving the vehicle with code U0101, as it can lead to further damage to the transmission and other components. It's best to address the issue promptly.

5. How can I repair OBDII code U0101 in my Nissan?

Repairing the code U0101 may involve replacing the Transmission Control Module, repairing or replacing damaged wiring, ensuring proper connections, and clearing the code with a diagnostic tool.

6. Is it possible to reset OBDII code U0101 in a Nissan without fixing the underlying issue?

While you can clear the code temporarily, it is likely to reappear if the root cause is not addressed. It's important to fix the underlying problem to prevent further issues.

7. Does OBDII code U0101 in a Nissan affect the vehicle's overall performance?

Yes, code U0101 can impact the vehicle's performance by causing transmission issues, inefficient shifting, and overall drivability problems.

8. Can a DIY enthusiast fix OBDII code U0101 in a Nissan, or is professional help necessary?

Depending on the level of expertise, a DIY enthusiast may be able to address the issue by following diagnostic procedures and repair steps. However, professional help is recommended for complex electrical and transmission issues.

9. How common is OBDII code U0101 in Nissan vehicles?

Code U0101 is relatively common in Nissan vehicles, especially in models with advanced electronic control systems and communication networks.

10. Are there any preventive measures to avoid encountering OBDII code U0101 in a Nissan?

Regular maintenance, checking for loose or damaged wiring, avoiding water damage to electronic components, and promptly addressing any warning signs can help prevent OBDII code U0101 in a Nissan.

Discuss the causes and fixes for U0101 Nissan OBDII Code

Submit a New Comment

  • U0101 en nissan altima 2007 2.5 sl

    Reply to Comment

  • Same information as above.

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

    Reply to Comment
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