AutoCodes – Hyundai – P1747 Hyundai

P1747 Hyundai Code - TCU-ECU Communication Line #1 Malfunction

Quick Answer

P1747 Hyundai indicates TCU-ECU Communication Line #1 Malfunction. Common causes for P1747 Hyundai include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. 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: P1747 Hyundai indicates TCU-ECU Communication Line #1 Malfunction.
Common causes: Common causes for P1747 Hyundai include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
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 4,566

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 14, 2019

Description
How To Fix
Cost to Diagnose
FAQs
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Code P1747 Hyundai Description

OBDII Code P1747 Hyundai - TCU-ECU Communication Line #1 Malfunction - AutoCodes.com — P1747 Hyundai Code - TCU-ECU Communication Line #1 Malfunction

How to Fix the DTC P1747 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 P1747 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 P1747 Hyundai code?

Need more information on how to fix the P1747 Hyundai code? Get Access to Factory Service Manuals

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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 P1747 Hyundai Code

1. What does the OBDII code P1747 mean for a Hyundai vehicle?

P1747 indicates a malfunction in the communication line #1 between the Transmission Control Unit (TCU) and Engine Control Unit (ECU).

2. What are the common symptoms of code P1747 in a Hyundai?

Symptoms may include transmission issues like rough shifting, delayed gear engagement, or the transmission operating in limp mode. The check engine light may also be illuminated.

3. What causes the P1747 code to appear in a Hyundai?

Common causes include damaged or disconnected wiring or connectors between the TCU and ECU, a faulty TCU or ECU, or electrical interference affecting signal transmission.

4. Can driving with code P1747 damage my Hyundaiâ€™s transmission?

Prolonged driving with this code and unresolved communication issues can lead to transmission performance problems or further damage, so itâ€™s best to address the issue promptly.

5. How can I diagnose the P1747 code in a Hyundai?

Check the wiring and connectors between the TCU and ECU for damage or disconnection. Use a diagnostic scanner to verify communication between the modules and check for other related codes.

6. How do I fix code P1747 in a Hyundai?

Repairs may include fixing or replacing damaged wiring or connectors, updating or reprogramming the TCU/ECU software, or replacing a faulty TCU or ECU.

7. Is P1747 a common code in Hyundai vehicles?

While not extremely common, P1747 can occur, especially in vehicles with aging electrical systems or after repairs involving the transmission or engine control modules.

8. What should I do if the P1747 code reappears after repairs?

Double-check all wiring and connections for proper installation, ensure the TCU and ECU software is properly updated, and consider further diagnostic testing to rule out module faults.

9. Can a low battery cause the P1747 code in a Hyundai?

Yes, a weak or failing battery can cause voltage irregularities, potentially triggering communication errors like P1747.

10. How much does it typically cost to fix the P1747 code in a Hyundai?

Repair costs can vary widely depending on the root cause, ranging from $50 for minor wiring repairs to over $1,000 if a TCU or ECU replacement is necessary.