AutoCodes – MINI – P0742 MINI

P0742 MINI Code - Torque Converter Clutch 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 MINI indicates Torque Converter Clutch 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 1,635

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 MINI 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 MINI - Torque Converter Clutch Stuck On - AutoCodes.com — P0742 MINI Code - Torque Converter Clutch Stuck On

What does this mean?

What are the Possible Causes of the DTC P0742 MINI?

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 MINI?

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 MINI 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 P0742 MINI Code

1. What are the common symptoms of OBDII code P0742 in a MINI?

The common symptoms of code P0742 in a MINI include engine stalling at idle, decreased fuel efficiency, and difficulty shifting gears.

2. What does the OBDII code P0742 indicate in a MINI?

Code P0742 in a MINI indicates that the torque converter clutch is stuck in the "on" position, leading to issues with the automatic transmission system.

3. What are the potential causes of OBDII code P0742 in a MINI?

Common causes of code P0742 in a MINI include a faulty torque converter clutch solenoid, low transmission fluid levels, or a malfunctioning torque converter itself.

4. How can I diagnose OBDII code P0742 in my MINI?

Diagnosing code P0742 involves using an OBDII scanner to retrieve the code, inspecting the transmission fluid levels and condition, and conducting a thorough inspection of the torque converter and its components.

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

It is not recommended to drive your MINI with code P0742 as it can lead to further damage to the transmission system. It is best to address the issue promptly to avoid costly repairs.

6. Is it possible to repair OBDII code P0742 in a MINI on my own?

While some minor repairs like checking and topping up transmission fluid can be done by DIY enthusiasts, diagnosing and repairing the root cause of P0742 often requires specialized knowledge and tools, so it is advisable to consult a professional mechanic.

7. How much does it typically cost to fix OBDII code P0742 in a MINI?

The cost of repairing code P0742 in a MINI can vary depending on the specific cause of the issue and the labor rates in your area. It is recommended to get estimates from multiple mechanics to find the best price.

8. Can a simple transmission fluid flush resolve OBDII code P0742 in a MINI?

In some cases, a transmission fluid flush may help resolve code P0742 if the issue is related to low or contaminated fluid. However, if the problem lies with the torque converter clutch or solenoid, more extensive repairs may be necessary.

9. How long does it typically take to fix OBDII code P0742 in a MINI?

The time needed to fix code P0742 in a MINI can vary depending on the exact cause of the issue and the availability of parts. Minor repairs may take a few hours, while more complex issues could require a day or more.

10. Is code P0742 a common problem in MINI vehicles?

While code P0742 is not one of the most common OBDII codes in MINI vehicles, it can still occur due to various factors affecting the torque converter clutch system. Regular maintenance and prompt attention to transmission issues can help prevent this code from appearing.