AutoCodes – Nissan – U0101 2012 Nissan Altima Sedan

U0101 2012 Nissan Altima Sedan 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 Altima Sedan 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 8,131

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

What does this mean?

What are the Possible Causes of the DTC U0101 2012 Nissan Altima Sedan?

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 Altima Sedan?

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 Altima Sedan 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 Altima Sedan Code

1. What does the OBDII code U0101 mean for a 2012 Nissan Altima Sedan?

The code U0101 indicates a communication problem between the engine control module (ECM) and the transmission control module (TCM) in a 2012 Nissan Altima Sedan.

2. What are the common symptoms of U0101 in a 2012 Nissan Altima Sedan?

Common symptoms may include issues with shifting gears, the transmission may not engage properly, the vehicle may go into limp mode, and the Check Engine Light may be illuminated.

3. What are some potential causes of the U0101 code in a 2012 Nissan Altima Sedan?

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

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

Diagnosis typically involves using a professional OBDII scanner to retrieve the specific code, checking the wiring and connectors for any visible damage, and performing a thorough inspection of the TCM and ECM.

5. Can I still drive my 2012 Nissan Altima Sedan with the U0101 code present?

It is not recommended to drive the vehicle with the U0101 code, as it can lead to further transmission issues and potentially cause safety concerns on the road.

6. How can I repair the U0101 code in my 2012 Nissan Altima Sedan?

Repair options may include repairing or replacing damaged wiring, connectors, the TCM, or the ECM. It is advisable to consult a professional mechanic for an accurate diagnosis and repair.

7. Will resetting the trouble codes clear the U0101 code in a 2012 Nissan Altima Sedan?

Resetting the trouble codes may temporarily clear the code, but it is essential to address the underlying communication issue between the ECM and TCM to prevent the code from reoccurring.

8. How much does it cost to repair the U0101 code in a 2012 Nissan Altima Sedan?

The cost of repairs for the U0101 code can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates at the repair shop. It is recommended to obtain multiple quotes from different mechanics.

9. Can a DIY enthusiast fix the U0101 code in a 2012 Nissan Altima Sedan?

While some skilled DIY enthusiasts may be able to address minor issues related to the U0101 code, diagnosing and repairing communication problems between the ECM and TCM often require specialized tools and expertise best left to professional mechanics.

10. How can I prevent the U0101 code from appearing in my 2012 Nissan Altima Sedan in the future?

Regular maintenance, such as checking the wiring harness for wear and tear, ensuring connectors are secure, and keeping the TCM and ECM software updated, can help prevent communication issues and the recurrence of the U0101 code.