AutoCodes – Infiniti – U0102 Infiniti

U0102 Infiniti Code - Lost Communication With Transfer Case 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 Check for more codes, Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted. 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: U0102 Infiniti indicates Lost Communication With Transfer Case Control Module.
Common causes: Common causes include Check for more codes, Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted.
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 1,226

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 Apr 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0102 Infiniti 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. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Transfer Case Control Module has not been received.

OBDII Code U0102 Infiniti - Lost Communication With Transfer Case Control Module - AutoCodes.com — U0102 Infiniti Code - Lost Communication With Transfer Case Control Module

What does this mean?

What are the Possible Causes of the DTC U0102 Infiniti?

Check for more codes
Faulty Transfer Case Control Module
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection

How to Fix the DTC U0102 Infiniti?

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 U0102 Infiniti 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 U0102 Infiniti Code

1. What does the OBDII code U0102 mean on an Infiniti?

The code U0102 indicates that there is a communication problem between the vehicle's main control unit (ECU) and the Transfer Case Control Module (TCCM). This issue prevents the ECU from receiving data from the TCCM.

2. What are the common symptoms of code U0102 in an Infiniti?

Symptoms may include the all-wheel-drive or four-wheel-drive system not engaging or functioning properly, an illuminated check engine light, and possibly other drivability issues depending on the model.

3. What can cause the U0102 code to appear on my Infiniti?

Common causes include faulty or damaged wiring, a bad connection in the TCCM circuit, a defective TCCM, or a malfunctioning ECU.

4. How is the U0102 code diagnosed in an Infiniti?

Diagnosis involves using a professional OBDII scanner to read the fault codes and monitor live data. Technicians will also visually inspect the wiring and connectors related to the TCCM, and may test the module's functionality using specialized equipment.

5. What are the steps to fix the U0102 code on an Infiniti?

Repair steps typically include repairing or replacing damaged wires or connectors, checking and possibly replacing the TCCM, and ensuring there are no faults with the ECU. Resetting the ECU and clearing the fault codes after repairs is also necessary to see if the issue recurs.

6. Is it safe to drive my Infiniti with the U0102 code active?

While the vehicle can often still be driven, functionality of the all-wheel or four-wheel drive system may be impaired, which could affect handling and safety in adverse driving conditions. It is advisable to address the issue promptly.

7. What tools are required to diagnose the U0102 code on an Infiniti?

Diagnosing this code typically requires an OBDII scanner capable of reading manufacturer-specific codes, as well as tools for testing electronic circuits, such as a multimeter and possibly an oscilloscope.

8. Can I fix the U0102 code on my Infiniti myself?

If you have experience with automotive electrical systems, you may be able to address simple causes such as loose connectors or damaged wires. However, if the problem involves the TCCM or ECU, professional diagnosis and repair are recommended.

9. How urgent is it to fix a U0102 code on an Infiniti?

It is moderately urgent to fix this code because while the vehicle may operate normally for daily driving, the impaired function of the drivetrain control systems can pose issues in challenging conditions, potentially leading to other more serious problems if not addressed.

10. What impact does ignoring the U0102 code have on an Infiniti?

Ignoring this code can lead to further damage in the vehicle's transfer case system, potentially resulting in more expensive repairs in the future. It can also compromise vehicle safety in situations where optimal traction is required.