AutoCodes – Lexus – P1647 Lexus

P1647 Lexus Code - Transmission Control Module System Malfunction

Quick Answer

P1647 Lexus indicates Transmission Control Module System Malfunction. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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: P1647 Lexus indicates Transmission Control Module System Malfunction.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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 1,419

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 Sep 05, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1647 Lexus Description

OBDII Code P1647 Lexus - Transmission Control Module System Malfunction - AutoCodes.com — P1647 Lexus Code - Transmission Control Module System Malfunction

What does this mean?

What are the Possible Causes of the DTC P1647 Lexus?

Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM) harness is open or shorted
Transmission Control Module (TCM) circuit poor electrical connection

How to Fix the DTC P1647 Lexus?

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 P1647 Lexus 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 P1647 Lexus Code

1. What are the common symptoms of OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- Common symptoms include issues with shifting gears smoothly, harsh shifting, transmission slippage, and the transmission going into limp mode.

2. What are some possible causes of OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- Potential causes include faulty transmission control module (TCM), damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission solenoid.

3. How can I diagnose OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the TCM for visible damage, checking the transmission fluid level, and conducting a thorough inspection of the wiring and connectors.

4. Can I continue driving my Lexus with OBDII code P1647 related to Transmission Control Module System Malfunction?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission and potentially leave you stranded on the road.

5. What are some repair tips for resolving OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- Repair tips may include replacing the faulty TCM, repairing or replacing damaged wiring or connectors, ensuring the transmission fluid is at the proper level, and addressing any other underlying issues causing the malfunction.

6. Is it possible to reset OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- While you can clear the code with a diagnostic scanner, it is crucial to address the underlying issue causing the malfunction to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from a couple of hundred dollars for minor repairs to over a thousand dollars for more extensive repairs involving the TCM.

8. Can a DIY enthusiast fix OBDII code P1647 in a Lexus related to Transmission Control Module System Malfunction?

- While some basic checks like inspecting wiring and connectors can be done by a DIY enthusiast, diagnosing and repairing complex issues with the TCM or transmission system may require specialized knowledge and tools best left to professionals.