AutoCodes – Nissan – U0101 2012 Nissan Pathfinder

U0101 2012 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 2012 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 3,941

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 2012 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 2012 Nissan Pathfinder - Lost Communication with Transmission Control Module - AutoCodes.com — U0101 2012 Nissan Pathfinder Code - Lost Communication with Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U0101 2012 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 2012 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 2012 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 2012 Nissan Pathfinder Code

1. What does the OBDII code U0101 in a 2012 Nissan Pathfinder indicate?

The code U0101 indicates that there is 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 2012 Nissan Pathfinder?

Common symptoms include the transmission going into limp mode, harsh shifting, delayed shifting, and the transmission not shifting at all.

3. What are some possible causes of the U0101 code in a 2012 Nissan Pathfinder?

Possible causes include a faulty TCM, damaged wiring or connectors between the ECM and TCM, a drained battery, or a software issue.

4. How can I diagnose the U0101 code in a 2012 Nissan Pathfinder?

Diagnosis involves checking the wiring and connectors for damage, ensuring the battery is charged, and using a scan tool to communicate with both the ECM and TCM to identify the communication issue.

5. How can I repair the U0101 code in a 2012 Nissan Pathfinder?

Repair options include repairing or replacing damaged wiring or connectors, reprogramming the TCM, or replacing the TCM if it is found to be faulty.

6. Can I continue driving my 2012 Nissan Pathfinder with the U0101 code?

It is not recommended to drive the vehicle with the U0101 code present, as it can lead to further damage to the transmission due to improper communication between the ECM and TCM.

7. How much does it typically cost to repair the U0101 code in a 2012 Nissan Pathfinder?

The cost of repair can vary depending on the exact cause of the communication issue, but it can range from a few hundred to over a thousand dollars.

8. Will resetting the trouble codes make the U0101 code go away permanently?

Simply resetting the trouble codes will not permanently fix the U0101 code. The underlying communication issue between the ECM and TCM needs to be addressed for a permanent solution.

9. Can extreme weather conditions cause the U0101 code to appear in a 2012 Nissan Pathfinder?

Yes, extreme weather conditions such as extreme heat or cold can sometimes cause electrical connections to become loose or damaged, leading to communication issues between modules.

10. Is the U0101 code specific to Nissan vehicles, or can it appear in other car makes and models?

The U0101 code is not specific to Nissan vehicles and can appear in other car makes and models as well, indicating a similar communication problem between the ECM and TCM.