AutoCodes – Chevrolet – P0740 Chevrolet

P0740 Chevrolet Code - Torque Converter Clutch Malfunction

Quick Answer

The Torque Converter Clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. 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 Chevrolet indicates Torque Converter Clutch Malfunction.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
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 57,703

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 Jul 30, 2022

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

The Torque Converter Clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. The TCC pressure control solenoid is a normally low-pressure control solenoid. The TCC pressure control solenoid regulates the transmission fluid to the TCC regulator valve in the lower valve body and the TCC control valve in the pump cover. When vehicle operating conditions are appropriate to apply the converter clutch, the Transmission Control Module (TCM) will increase TCC pressure control current flow (duty cycle) to the TCC solenoid. The TCC pressure control solenoid directs fluid pressure to move the TCC control valve to the apply position and moves the TCC regulator apply valve to the regulating position. The TCC regulator valve regulates TCC apply fluid pressure proportional to TCC solenoid pressure. When the TCC is fully applied, the engine is coupled directly to the transmission. TCC release is accomplished by the Transmission Control Module decreasing current flow to the TCC pressure control solenoid. This results in decreasing the applied pressure which allows the TCC control valve to move to the release position. The Transmission Control Module calculates torque converter slip speed based on engine speed and transmission input shaft speed.

OBDII Code P0740 Chevrolet - Torque Converter Clutch Malfunction - AutoCodes.com — P0740 Chevrolet Code - Torque Converter Clutch Malfunction

What does this mean?

What are the Possible Causes of the DTC P0740 Chevrolet?

Low transmission fluid level
Dirty transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness is open or shorted
Control Solenoid Valve Assembly circuit poor electrical connection
Transmission internal mechanical problem

How to Fix the DTC P0740 Chevrolet?

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 Chevrolet 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 Chevrolet Code

No Frequently Asked Questions about P0740 Chevrolet Code found.

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nathan
Date: December 15, 2014 at 6:51 am

po740 torque converter clutch / circuit open.... any ideas on what that means and if so where do i find it on a 97 chevy blazer

Reply to Comment
OBDIITech
Date: December 16, 2014 at 6:17 am

The "Torque Converter Clutch Solenoid" it's the device that controls the fluid flow for the torque converter lockup function. The P0740 code means that either the solenoid it's malfunction or the fluid inside the transmission it's flowing. You could start by changing the transmission fluid, if the problem persist you may have to replace the solenoid. The solenoid is inside the transmission..

Reply to Comment
Vincent
Date: July 24, 2015 at 3:03 am

Where is the Torque Converter Clutch Solenoid located in the transmission? I had already changed the fluid, filler, and the 1-2 and 2-3 solenoid shifting control. also the 3-2 control solenoid. And the check engine light is still coming on showing the code "P0740".

Reply to Comment
OBDIITech
Date: July 24, 2015 at 9:26 pm

What model and year is your Chevrolet? usually attached to the transmission valve body. The valve body is inside the transmission, but you can access the valve body by removing the transmission pan.

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