AutoCodes – Chrysler – P0740 Chrysler

P0740 Chrysler Code - Torque Converter Clutch Circuit

Quick Answer

The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty torque converter clutch solenoid valve. 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 Chrysler indicates Torque Converter Clutch Circuit.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty torque converter clutch solenoid valve.
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 65,673

How popular is this code, among other codes? Medium

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 Dec 04, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0740 Chrysler Description

The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

OBDII Code P0740 Chrysler - Torque Converter Clutch Circuit - AutoCodes.com — P0740 Chrysler Code - Torque Converter Clutch Circuit

What does this mean?

What are the Possible Causes of the DTC P0740 Chrysler?

Low transmission fluid level
Dirty transmission fluid
Faulty torque converter clutch solenoid valve
Torque converter clutch solenoid valve harness is open or shorted
Torque converter clutch solenoid valve circuit poor electrical connection

How to Fix the DTC P0740 Chrysler?

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 P0740 Chrysler 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 P0740 Chrysler Code

1. What are the common symptoms of OBDII code P0740 in a Chrysler vehicle?

The common symptoms include engine stalling at stops, transmission slipping, difficulty shifting gears, and decreased fuel efficiency.

2. What are the possible causes of the OBDII code P0740 in a Chrysler vehicle?

The code P0740 is typically caused by a faulty torque converter clutch solenoid, a malfunctioning torque converter clutch, low transmission fluid, or wiring issues.

3. How serious is the OBDII code P0740 in a Chrysler vehicle?

Code P0740 can lead to further damage to the transmission if left unresolved, so it is important to address it promptly to avoid potential costly repairs.

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

It is not recommended to continue driving the vehicle with code P0740, as it can lead to transmission issues and potential safety hazards. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose OBDII code P0740 in my Chrysler vehicle?

Diagnosing code P0740 usually involves checking the transmission fluid level and condition, inspecting the torque converter clutch solenoid, examining the wiring for any damage, and performing a thorough transmission scan.

6. What are some repair tips for fixing OBDII code P0740 in a Chrysler vehicle?

Repair tips include replacing the torque converter clutch solenoid, inspecting the torque converter for damage, ensuring the transmission fluid is at the proper level and in good condition, and addressing any wiring issues.

7. Can a DIY enthusiast fix OBDII code P0740 in a Chrysler vehicle?

While some experienced DIY enthusiasts may be able to address simple causes of code P0740, it is generally recommended to have a professional mechanic diagnose and repair this issue due to its complexity and importance.

8. How much does it typically cost to repair OBDII code P0740 in a Chrysler vehicle?

The cost of repairs for code P0740 can vary depending on the exact cause of the issue and the labor rates in your area. It is advisable to get multiple quotes from reputable mechanics to compare prices.

9. Will resetting the OBDII code P0740 in my Chrysler vehicle make it go away permanently?

Resetting the code may temporarily turn off the Check Engine light, but if the underlying issue causing code P0740 is not addressed, the code is likely to reappear. It is essential to fix the root cause of the problem to prevent further issues.

10. How can I prevent OBDII code P0740 from appearing in my Chrysler vehicle?

Regular maintenance, including checking and changing transmission fluid at recommended intervals, can help prevent code P0740 from appearing. Additionally, driving gently and avoiding aggressive acceleration can help prolong the life of the transmission components.