AutoCodes – Mitsubishi – P0742 Mitsubishi

P0742 Mitsubishi Code - Torque Converter Clutch System Malfunction

Quick Answer

The Torque Converter Clutch (TCC) 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: P0742 Mitsubishi indicates Torque Converter Clutch System Malfunction.
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 4,960

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0742 Mitsubishi Description

The Torque Converter Clutch (TCC) 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 P0742 Mitsubishi - Torque Converter Clutch System Malfunction - AutoCodes.com — P0742 Mitsubishi Code - Torque Converter Clutch System Malfunction

What does this mean?

What are the Possible Causes of the DTC P0742 Mitsubishi?

Low transmission fluid level
Dirty transmission fluid
Faulty torque converter clutch solenoid valve
Torque converter clutch solenoid valve harness or connectors
Torque converter clutch solenoid valve circuit is open or shorted
Transmission internal mechanical problem

How to Fix the DTC P0742 Mitsubishi?

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 does this mean?

Code Tech Notes

When the a transmission solenoid is stuck on, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0742 Mitsubishi 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.

Need more information about the P0742 Mitsubishi code?

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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 P0742 Mitsubishi Code

1. What are the common symptoms of OBDII code P0742 in a Mitsubishi related to the torque converter clutch system malfunction?

Symptoms may include harsh shifting, decreased fuel efficiency, slipping transmission, and the illumination of the Check Engine Light.

2. What are the potential causes of OBDII code P0742 in a Mitsubishi?

Common causes include a faulty torque converter clutch solenoid, low transmission fluid levels, internal transmission issues, or a malfunctioning torque converter itself.

3. How can I diagnose the OBDII code P0742 in my Mitsubishi?

Diagnosis typically involves using a scan tool to retrieve the code, inspecting the transmission fluid level and condition, and performing a thorough visual inspection of the transmission components.

4. What are the repair options for resolving OBDII code P0742 in a Mitsubishi?

Repair options may include replacing the torque converter clutch solenoid, addressing any transmission fluid leaks, performing a transmission flush, or replacing the torque converter if necessary.

5. Can driving with OBDII code P0742 in a Mitsubishi cause further damage to the vehicle?

Continuing to drive with this code may lead to further damage to the transmission components, potentially resulting in more extensive and costly repairs down the line.

6. Are there any DIY tips for addressing OBDII code P0742 in a Mitsubishi?

While some basic checks like inspecting the transmission fluid level can be done by DIY enthusiasts, diagnosing and repairing the underlying cause of the code typically requires professional expertise.

7. How much does it cost to repair OBDII code P0742 in a Mitsubishi?

Repair costs can vary depending on the specific cause of the code, the labor rates in your area, and whether any transmission components need to be replaced. It's advisable to obtain quotes from reputable mechanics.

8. Is it safe to drive my Mitsubishi with OBDII code P0742?

It is not recommended to drive the vehicle extensively with this code present, as it can lead to transmission issues and potential breakdowns. It's best to address the problem promptly.

9. Can resetting the Check Engine Light resolve OBDII code P0742 in a Mitsubishi?

Resetting the light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on once the problem is detected again.

10. How long does it typically take to repair OBDII code P0742 in a Mitsubishi?

The repair time can vary based on the specific cause of the code and the extent of the repairs needed. It's best to consult with a professional technician for a more accurate estimate based on your vehicle's condition.