AutoCodes – Nissan – U0101 2009 Nissan Pathfinder

U0101 2009 Nissan Pathfinder 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 2009 Nissan Pathfinder 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 3,467

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 Mar 23, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0101 2009 Nissan Pathfinder 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 2009 Nissan Pathfinder - Lost Communication with Transmission Control Module - AutoCodes.com — U0101 2009 Nissan Pathfinder Code - Lost Communication with Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U0101 2009 Nissan Pathfinder?

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 2009 Nissan Pathfinder?

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 2009 Nissan Pathfinder 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 U0101 2009 Nissan Pathfinder Code

1. What does the OBDII code U0101 on a 2009 Nissan Pathfinder indicate?

The code U0101 on a 2009 Nissan Pathfinder indicates a communication problem between the engine control module (ECM) and the transmission control module (TCM).

2. What are the common symptoms of the U0101 code in a 2009 Nissan Pathfinder?

Common symptoms of the U0101 code in a 2009 Nissan Pathfinder include transmission shifting issues, hesitation or jerking during acceleration, and the transmission going into limp mode.

3. What are some possible causes of the U0101 code in a 2009 Nissan Pathfinder?

Possible causes of the U0101 code in a 2009 Nissan Pathfinder include faulty wiring or connections between the ECM and TCM, a malfunctioning TCM, a defective ECM, or a communication bus fault.

4. How can I diagnose the U0101 code on my 2009 Nissan Pathfinder?

Diagnosing the U0101 code on a 2009 Nissan Pathfinder involves checking the wiring and connections between the ECM and TCM, testing the TCM for proper function, and using a scan tool to check for communication faults.

5. How can I repair the U0101 code on my 2009 Nissan Pathfinder?

To repair the U0101 code on a 2009 Nissan Pathfinder, you may need to repair or replace any damaged wiring or connections, replace the TCM if faulty, reprogram the TCM, or address any communication bus issues.

6. Can I still drive my 2009 Nissan Pathfinder with the U0101 code?

It is not recommended to drive your 2009 Nissan Pathfinder with the U0101 code present, as it can lead to further transmission issues and potential safety hazards. It's best to address the problem promptly.

7. How much does it typically cost to repair the U0101 code on a 2009 Nissan Pathfinder?

The cost to repair the U0101 code on a 2009 Nissan Pathfinder can vary depending on the root cause of the issue. Repairs may range from a simple wiring fix to replacing the TCM, so it's best to consult with a professional for an accurate estimate.

8. Can resetting the trouble codes clear the U0101 code on a 2009 Nissan Pathfinder?

Resetting the trouble codes may temporarily clear the U0101 code, but if the underlying issue causing the communication problem between the ECM and TCM is not addressed, the code is likely to reappear.

9. Are there any recalls or technical service bulletins related to the U0101 code in a 2009 Nissan Pathfinder?

It's recommended to check with Nissan or a trusted mechanic for any recalls or technical service bulletins related to the U0101 code in a 2009 Nissan Pathfinder, as manufacturers may provide guidance on common issues and solutions.

10. How can I prevent the U0101 code from appearing in my 2009 Nissan Pathfinder in the future?

Regular maintenance and inspections of the ECM, TCM, wiring, and communication systems can help prevent the U0101 code from appearing in your 2009 Nissan Pathfinder. Addressing any issues promptly can also help avoid more significant problems down the line.