AutoCodes – Infiniti – U1A03 Infiniti

U1A03 Infiniti Code - Telematics Control Unit SIM Card

Quick Answer

The Diagnostic Trouble Code (DTC) will set when the Telematics Control Unit (TCU) SIM card is not inserted or unable to be read. Common causes include Faulty Telematics Control Unit (TCU), Telematics Control Unit harness is open or shorted, Telematics Control Unit 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: U1A03 Infiniti indicates Telematics Control Unit SIM Card.
Common causes: Common causes include Faulty Telematics Control Unit (TCU), Telematics Control Unit harness is open or shorted, Telematics Control Unit 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 1,202

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 Jun 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1A03 Infiniti Description

The Diagnostic Trouble Code (DTC) will set when the Telematics Control Unit (TCU) SIM card is not inserted or unable to be read.

OBDII Code U1A03 Infiniti - Telematics Control Unit SIM Card - AutoCodes.com — U1A03 Infiniti Code - Telematics Control Unit SIM Card

What does this mean?

What are the Possible Causes of the DTC U1A03 Infiniti?

Faulty Telematics Control Unit (TCU)
Telematics Control Unit harness is open or shorted
Telematics Control Unit circuit poor electrical connection

How to Fix the DTC U1A03 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 U1A03 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.

Need more information about the U1A03 Infiniti code?

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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 U1A03 Infiniti Code

1. What does the OBDII code U1A03 for Infiniti mean?

The U1A03 code specifically relates to a problem with the Telematics Control Unit SIM Card in Infiniti vehicles.

2. What are common symptoms of the U1A03 code in an Infiniti?

Common symptoms of the U1A03 code may include issues with the vehicle's telematics system, poor GPS signal reception, and connectivity problems with remote services.

3. What can cause the U1A03 code to trigger in an Infiniti?

The U1A03 code can be triggered by a faulty SIM card, a malfunction in the telematics control unit, damaged wiring, or poor connection to the SIM card.

4. How can I diagnose the U1A03 code in my Infiniti?

Diagnosing the U1A03 code typically involves checking the SIM card and its connections, inspecting the telematics control unit, and testing the wiring for any faults.

5. Can I still drive my Infiniti with the U1A03 code present?

In most cases, it is safe to drive your Infiniti with the U1A03 code present, as it primarily affects the telematics and GPS functions rather than the vehicle's drivability.

6. How do I repair the U1A03 code in my Infiniti?

Repairing the U1A03 code may involve replacing the SIM card, repairing or replacing the telematics control unit, fixing any wiring issues, or ensuring proper connection to the SIM card.

7. Can I fix the U1A03 code in my Infiniti myself?

While some basic checks like inspecting connections and wiring can be done by DIY enthusiasts, diagnosing and repairing the U1A03 code often requires professional tools and expertise.

8. Will the U1A03 code cause my Infiniti to fail an emissions test?

The U1A03 code is related to the telematics system and should not directly impact emissions, so it is unlikely to cause your Infiniti to fail an emissions test.

9. How much does it typically cost to repair the U1A03 code in an Infiniti?

The cost of repairing the U1A03 code can vary depending on the exact cause of the issue, but it may range from a simple SIM card replacement to a more complex telematics control unit repair, potentially costing a few hundred to a thousand dollars.

10. Can resetting the OBDII system clear the U1A03 code in my Infiniti?

Resetting the OBDII system may temporarily clear the U1A03 code, but if the underlying issue with the Telematics Control Unit SIM Card is not addressed, the code is likely to reappear.