P0740 Code - Torque Converter Clutch Malfunction

Quick Answer

When a vehicle's onboard diagnostic system detects a P0740 trouble code, it indicates a malfunction in the torque converter clutch (TCC) circuit. Common causes include Faulty torque converter clutch solenoid, Damaged torque converter clutch, Low transmission fluid levels. 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

P0740 indicates Torque Converter Clutch Malfunction.

Common causes

Common causes include Faulty torque converter clutch solenoid, Damaged torque converter clutch, Low transmission fluid levels.

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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
• Comments
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Common Causes of P0740

Symptoms of P0740

How to Fix P0740

Cost to Fix P0740

When is the Code Detected?

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Code P0740 Information for Specific Makes

• P0740 Acura — Transmission Lock-Up Control System Fault
• P0740 Audi — Torque Converter Clutch Circuit Malfunction
• P0740 BMW — Torque Converter Clutch Circuit Open
• P0740 Buick — Torque Converter Clutch Malfunction
• P0740 Cadillac — Torque Converter Clutch Malfunction
• P0740 Chevrolet — Torque Converter Clutch Malfunction
• P0740 Chrysler — Torque Converter Clutch Circuit
• P0740 Dodge — Torque Converter Clutch Circuit
• P0740 Ford — Torque Converter Clutch Solenoid Circuit
• P0740 GMC — Torque Converter Clutch Malfunction
• P0740 Honda — Transmission Lock-Up Control System Fault
• P0740 Hummer — Torque Converter Clutch Malfunction
• P0740 Hyundai — Torque Converter Clutch Solenoid Valve
• P0740 Infiniti — Torque Converter Clutch Solenoid Valve
• P0740 Isuzu — Torque Converter Clutch Solenoid Valve Circuit Fault
• P0740 Jeep — Torque Converter Clutch Circuit
• P0740 KIA — Damper Clutch Solenoid System
• P0740 Mazda — Torque Converter Clutch Solenoid Valve Circuit Malfunction
• P0740 Mercedes-Benz — Torque Converter Clutch Malfunction
• P0740 MINI — Torque Converter Clutch Circuit Open
• P0740 Mitsubishi — Torque Converter Clutch System Malfunction
• P0740 Nissan — Torque Converter Clutch Solenoid Circuit Fault
• P0740 Pontiac — Torque Converter Clutch Malfunction
• P0740 RAM — Torque Converter Clutch Circuit
• P0740 Saturn — Torque Converter Clutch Malfunction
• P0740 Subaru — Torque Converter Clutch System Malfunction
• P0740 Suzuki — Torque Converter Clutch Circuit Malfunction
• P0740 Volkswagen — Torque Converter Clutch Circuit Malfunction

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 P0740 Code

1. What are the common symptoms of OBDII code P0740 (Torque Converter Clutch Malfunction)?

The common symptoms of P0740 include engine stalling at idle, slippage or shuddering during acceleration, and decreased fuel efficiency.

2. What are the possible causes of OBDII code P0740?

The main causes of P0740 include a faulty torque converter clutch solenoid, low transmission fluid levels, a malfunctioning torque converter, or wiring issues in the transmission system.

3. Can I continue to drive my vehicle with OBDII code P0740?

It is not recommended to drive your vehicle with P0740 for an extended period as it can lead to further damage to the transmission. It is best to have the issue diagnosed and repaired promptly.

4. How is OBDII code P0740 diagnosed?

P0740 is typically diagnosed using a scan tool to retrieve the trouble code from the vehicle's computer. Additional testing may involve checking the transmission fluid level, inspecting the torque converter clutch solenoid, and conducting a road test to confirm the symptoms.

5. How can I repair OBDII code P0740?

Repairing P0740 may involve replacing the torque converter clutch solenoid, addressing any transmission fluid leaks, checking and potentially replacing the torque converter, or fixing any wiring issues in the transmission system.

6. Can a DIY enthusiast fix OBDII code P0740 at home?

While some aspects of diagnosing and repairing P0740 may be within reach of a skilled DIY enthusiast, dealing with transmission-related issues can be complex. It is recommended to seek professional help to ensure the problem is properly diagnosed and repaired.

7. Is OBDII code P0740 a serious issue?

P0740 can lead to significant transmission problems if left unaddressed. Ignoring the issue can cause further damage to the transmission components, leading to costly repairs down the line.

8. How much does it typically cost to repair OBDII code P0740?

The cost of repairing P0740 can vary depending on the specific cause of the issue and the labor rates in your area. It is recommended to get multiple quotes from reputable repair shops to compare prices.

9. Can OBDII code P0740 be triggered intermittently?

Yes, P0740 can sometimes be triggered intermittently, especially if the issue is related to a faulty solenoid or intermittent wiring problem. It is still important to address the problem promptly to avoid potential transmission damage.

10. Will resetting the OBDII code P0740 clear the issue?

Resetting the code may temporarily clear the check engine light, but it will not fix the underlying problem causing P0740. It is crucial to diagnose and repair the issue to prevent further transmission damage.