AutoCodes – BMW – P0742 BMW

P0742 BMW 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 BMW 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 12,271

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

What does this mean?

What are the Possible Causes of the DTC P0742 BMW?

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 BMW?

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 BMW 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 BMW Code

1. What are the common symptoms of OBDII code P0742 in a BMW related to the torque converter clutch being 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 in a BMW indicating a stuck torque converter clutch?

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

3. How can I diagnose the cause of OBDII code P0742 in my BMW?

- Diagnosing the issue may involve conducting a thorough inspection of the transmission system, checking the transmission fluid level and condition, and using a scan tool to monitor the clutch solenoid operation.

4. Is it safe to continue driving my BMW with OBDII code P0742 indicating a stuck torque converter clutch?

- It is not recommended to drive the vehicle for an extended period with this code, as it can lead to further damage to the transmission system and potentially result in costly repairs.

5. What are the repair options for fixing OBDII code P0742 in a BMW?

- Repair options may include replacing the torque converter clutch solenoid, repairing or replacing the torque converter, ensuring proper transmission fluid levels and quality, and clearing the code with a scan tool.

6. Can I reset the OBDII code P0742 in my BMW using a simple DIY method?

- While you may be able to clear the code temporarily using a scan tool, it is essential to address the underlying issue causing the code to prevent further damage.

7. How much does it typically cost to repair OBDII code P0742 in a BMW at a professional mechanic or dealership?

- The cost of repairing this code can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any preventive maintenance tips to avoid encountering OBDII code P0742 in a BMW in the future?

- Regularly checking and maintaining proper transmission fluid levels, addressing any transmission issues promptly, and following the manufacturer's recommended service intervals can help prevent this code from occurring.

9. Can a DIY enthusiast with intermediate automotive skills attempt to repair OBDII code P0742 in a BMW?

- While some repairs related to this code may be within reach of a DIY enthusiast, it is essential to have the necessary tools, knowledge, and experience to work on the transmission system safely and effectively.

10. How urgent is it to address OBDII code P0742 indicating a stuck torque converter clutch in a BMW?

- It is recommended to address this code as soon as possible to prevent further damage to the transmission system and ensure the vehicle's safe operation.