AutoCodes – Hyundai – U0101 Hyundai

U0101 Hyundai Code - Lost Communication With Transmission Control Module

Quick Answer

Checking Transmission Control Module (TCM) ID under detecting condition, if the Engine Control Module (ECM) does not take TCM signal within a certain period, Powertrain Control Module (PCM) sets U0101. Common causes include Check for more codes, Faulty Transmission Control Module (TCM), TCM 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: U0101 Hyundai indicates Lost Communication With Transmission Control Module .
Common causes: Common causes include Check for more codes, Faulty Transmission Control Module (TCM), TCM 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 8,956

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 Nov 20, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0101 Hyundai Description

OBDII Code U0101 Hyundai - Lost Communication With Transmission Control Module - AutoCodes.com — U0101 Hyundai Code - Lost Communication With Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U0101 Hyundai?

Check for more codes
Faulty Transmission Control Module (TCM)
TCM harness is open or shorted
TCM circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC U0101 Hyundai?

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 Hyundai 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 U0101 Hyundai 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 U0101 Hyundai Code

1. What are the common symptoms of OBDII code U0101 (Lost Communication With Transmission Control Module) in a Hyundai?

- Common symptoms include issues with shifting gears, hesitation or jerking during acceleration, and the transmission getting stuck in a single gear.

2. What are the possible causes of OBDII code U0101 in a Hyundai?

- The code U0101 can be triggered by a faulty transmission control module, damaged wiring or connectors, a malfunctioning CAN bus network, or a drained vehicle battery.

3. How can I diagnose OBDII code U0101 in my Hyundai?

- Diagnosing code U0101 typically involves checking for other related trouble codes, inspecting the transmission control module and its connections, testing the CAN bus network, and verifying the battery's voltage and condition.

4. Can OBDII code U0101 in a Hyundai be repaired without professional help?

- While some basic troubleshooting steps can be taken by DIY enthusiasts, resolving code U0101 often requires specialized diagnostic equipment and expertise. It is recommended to consult a qualified mechanic for accurate diagnosis and repair.

5. Is it safe to continue driving my Hyundai with OBDII code U0101 present?

- It is not recommended to continue driving a vehicle with code U0101 as it can lead to further transmission issues and potential safety risks. It is best to address the problem promptly to avoid more severe damage.

6. How much does it cost to repair OBDII code U0101 in a Hyundai?

- The cost of repairing code U0101 can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It is advisable to obtain quotes from different repair shops for an accurate estimate.

7. Can a software update fix OBDII code U0101 in a Hyundai?

- In some cases, a software update from the manufacturer may address communication issues and resolve code U0101. It is recommended to consult with a dealership or qualified technician to determine if this solution is applicable to your vehicle.

8. Will resetting the trouble codes clear OBDII code U0101 in a Hyundai?

- Resetting the trouble codes may temporarily clear code U0101, but it is likely to reappear if the underlying issue is not addressed. It is essential to diagnose and repair the root cause of the problem to prevent the code from returning.

9. How long does it take to repair OBDII code U0101 in a Hyundai?

- The repair time for code U0101 can vary depending on the complexity of the issue, the availability of parts, and the workload of the repair shop. Some repairs may be completed within a few hours, while others could take longer.

10. Can extreme weather conditions affect OBDII code U0101 in a Hyundai?

- Extreme weather conditions such as extreme heat or cold can potentially impact the electrical connections and components related to code U0101. It is essential to maintain proper vehicle maintenance and protect it from harsh weather to prevent such issues.