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P1787 Acura Code - Automatic Transmission Lock-Up Clutch Malfunction

Quick Answer

The P1787 diagnostic trouble code (DTC) for Acura vehicles indicates an issue with the automatic transmission lock-up clutch. Common causes include Wear and tear on the lock-up clutch components, Fluid contamination, Electrical 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
P1787 Acura indicates Automatic Transmission Lock-Up Clutch Malfunction.
Common causes
Common causes include Wear and tear on the lock-up clutch components, Fluid contamination, Electrical 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1787 Acura Description

The P1787 diagnostic trouble code (DTC) for Acura vehicles indicates an issue with the automatic transmission lock-up clutch. The lock-up clutch is a critical component of the transmission system that is responsible for locking the torque converter, allowing for a direct mechanical connection between the engine and the transmission. When this clutch malfunctions, it can lead to various performance issues with the vehicle's transmission system.

OBDII Code P1787 Acura - Automatic Transmission Lock-Up Clutch Malfunction
P1787 Acura Code - Automatic Transmission Lock-Up Clutch Malfunction

Common Causes of P1787 Acura

  1. Wear and tear on the lock-up clutch components
  2. Fluid contamination
  3. Electrical issues
  4. Mechanical failures within the transmission system

Symptoms of P1787 Acura

  1. Erratic shifting
  2. Slipping gears
  3. Harsh engagement
  4. Reduced fuel efficiency
  5. Transmission failure to engage properly

How to Fix P1787 Acura

  1. Diagnose the specific cause of the lock-up clutch malfunction using a scan tool to retrieve the DTC and perform a visual inspection of the transmission system.
  2. Inspect the lock-up clutch components for wear and tear, replacing any damaged parts as necessary.
  3. Check the transmission fluid for contamination and replace it if necessary.
  4. Inspect the electrical connections related to the lock-up clutch for any loose connections or corrosion, repairing or replacing as needed.
  5. Test drive the vehicle to ensure that the transmission is operating smoothly and that the lock-up clutch is functioning properly.

Cost to Fix P1787 Acura

The typical repair costs for addressing a P1787 code related to automatic transmission lock-up clutch malfunction can range from $500 to $1500, depending on the extent of the damage, the labor rates in your area, and the specific components that need to be replaced. It's important to note that additional costs may arise if further damage is found within the transmission system. It's advisable to get a detailed estimate from a qualified mechanic or dealership before proceeding with the repairs.

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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 P1787 Acura Code

1. What does the OBDII code P1787 mean on an Acura?

P1787 indicates an Automatic Transmission Lock-Up Clutch Malfunction, meaning the transmission’s lock-up clutch is not engaging or disengaging properly.

2. What are the common symptoms of code P1787 in an Acura?

Symptoms may include poor fuel efficiency, transmission slipping, harsh shifting, engine stalling at low speeds, and illumination of the check engine light.

3. What causes the P1787 code in an Acura?

Common causes include a faulty lock-up solenoid, transmission fluid issues (low, dirty, or incorrect type), wiring or electrical problems, or internal transmission damage.

4. Can driving with a P1787 code damage my Acura's transmission?

Yes, continuing to drive with this issue can cause further transmission damage or overheating, so it's best to address it promptly.

5. How do I diagnose the P1787 code on my Acura?

Diagnosis involves checking the transmission fluid condition, inspecting the lock-up solenoid, testing wiring and connectors, and performing a scan tool test to monitor lock-up clutch operation.

6. How do I fix the P1787 code on an Acura?

Repairs may include replacing the lock-up solenoid, flushing or replacing the transmission fluid, repairing wiring or connectors, or addressing internal transmission issues.

7. Can low or dirty transmission fluid cause the P1787 code?

Yes, low or contaminated transmission fluid can prevent the lock-up clutch from working properly and trigger the P1787 code.

8. Is the P1787 code specific to Acura vehicles?

While P1787 is more common in Acura and Honda vehicles, other manufacturers may use similar codes for lock-up clutch malfunctions.

9. How much does it cost to fix the P1787 code in an Acura?

Repair costs vary depending on the severity of the issue, ranging from $100 for fluid changes to over $1,000 for solenoid or transmission repairs.

10. Can I reset the P1787 code without fixing the issue?

You can clear the code with a scan tool, but it will likely return if the underlying problem isn’t resolved.

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