AutoCodes – Generic – P0742

P0742 Code - Torque Converter Clutch Circuit Stuck On

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 indicates Torque Converter Clutch Circuit Stuck On.
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 45,645

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0742 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 - Torque Converter Clutch Circuit Stuck On - AutoCodes.com — P0742 Code - Torque Converter Clutch Circuit Stuck On

What does this mean?

What are the Possible Causes of the DTC P0742?

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?

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 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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Information for Specific Makes

P0742 Acura — Torque Converter Clutch Stuck On
P0742 BMW — Torque Converter Clutch Stuck On
P0742 Buick — Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 Cadillac — Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 Chevrolet — Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 Chrysler — Torque Converter Clutch Stuck On
P0742 Dodge — Torque Converter Clutch Stuck On
P0742 GMC — Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 Hyundai — Damper Clutch Circuit Stuck On
P0742 Isuzu — Torque Converter Clutch Circuit Stuck On
P0742 Jeep — Torque Converter Clutch Stuck On
P0742 KIA — Torque Converter Clutch Circuit Stuck On
P0742 Mazda — Torque Converter Clutch Circuit Stuck On
P0742 Mercedes-Benz — Torque Converter Clutch Circuit Stuck On
P0742 MINI — Torque Converter Clutch Stuck On
P0742 Mitsubishi — Torque Converter Clutch System Malfunction
P0742 Oldsmobile — Torque Converter Clutch Circuit Stuck On
P0742 Pontiac — Torque Converter Clutch Circuit Stuck On
P0742 Saturn — Torque Converter Clutch Circuit Stuck On
P0742 Suzuki — Torque Converter Clutch Solenoid Performance Or Stuck On

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 Code

1. What are the common symptoms of OBDII code P0742 (Torque Converter Clutch Circuit Stuck On)?

- Common symptoms include engine stalling at idle, decreased fuel efficiency, and difficulty shifting gears.

2. What are the possible causes of OBDII code P0742?

- The code P0742 can be caused by issues such as a faulty torque converter clutch solenoid, a malfunctioning torque converter clutch circuit, or low transmission fluid levels.

3. How serious is OBDII code P0742?

- This code should be addressed promptly as it can lead to transmission overheating, reduced fuel economy, and potential damage to the transmission components over time.

4. How can I diagnose OBDII code P0742?

- Diagnosing this code typically involves using a scan tool to check for the specific code, testing the torque converter clutch solenoid, and inspecting the transmission fluid level and condition.

5. Can I continue driving my vehicle with OBDII code P0742?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission. It's best to address the issue as soon as possible.

6. How can OBDII code P0742 be repaired?

- Repairing this code may involve replacing the torque converter clutch solenoid, repairing or replacing damaged wiring in the circuit, or addressing any underlying issues causing the fault.

7. Is it possible to reset OBDII code P0742 without fixing the underlying issue?

- While it is possible to clear the code temporarily, it will likely reappear if the underlying issue causing the fault is not addressed.

8. Can a DIY enthusiast fix OBDII code P0742 at home?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code at home by following repair guides and videos. However, professional help is recommended for more complex repairs.

9. How much does it typically cost to repair OBDII code P0742 at a mechanic or dealership?

- Repair costs can vary based on the specific issue causing the code, but on average, expect to pay anywhere from $200 to $600 for parts and labor at a mechanic or dealership.

10. Are there any preventive maintenance tips to avoid OBDII code P0742 in the future?

- To prevent OBDII code P0742, it is recommended to regularly check and change transmission fluid, address any leaks promptly, and ensure proper maintenance of the torque converter and related components.