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P0742 Oldsmobile Code - Torque Converter Clutch Circuit Stuck On

Quick Answer

P0742 is a diagnostic trouble code (DTC) that indicates an issue with the torque converter clutch (TCC) circuit being stuck on in an Oldsmobile vehicle. Common causes include Faulty TCC solenoid, Damaged wiring or connectors in the TCC circuit, Low transmission fluid levels. 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 Oldsmobile indicates Torque Converter Clutch Circuit Stuck On.
Common causes
Common causes include Faulty TCC solenoid, Damaged wiring or connectors in the TCC circuit, Low transmission fluid levels.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0742 Oldsmobile Description

P0742 is a diagnostic trouble code (DTC) that indicates an issue with the torque converter clutch (TCC) circuit being stuck on in an Oldsmobile vehicle. The torque converter clutch is responsible for engaging and disengaging the torque converter lock-up function, which helps improve fuel efficiency and reduces heat buildup in the transmission. When the TCC circuit is stuck on, it means that the torque converter clutch is not disengaging properly, leading to potential performance issues and increased fuel consumption.

OBDII Code P0742 Oldsmobile - Torque Converter Clutch Circuit Stuck On
P0742 Oldsmobile Code - Torque Converter Clutch Circuit Stuck On

Common Causes of P0742 Oldsmobile

  1. Faulty TCC solenoid
  2. Damaged wiring or connectors in the TCC circuit
  3. Low transmission fluid levels
  4. Malfunctioning torque converter

Symptoms of P0742 Oldsmobile

  1. Reduced fuel efficiency
  2. Engine stalling at idle or when coming to a stop
  3. Harsh or delayed shifting
  4. Illuminated check engine light

How to Fix P0742 Oldsmobile

  1. Perform a diagnostic scan to confirm the P0742 code and identify the specific cause of the issue.
  2. Inspect the TCC solenoid, wiring, and connectors for any damage or corrosion.
  3. Check the transmission fluid level and quality, and top up or replace if necessary.
  4. Test the torque converter for proper operation and replace if found to be faulty.
  5. Clear the code and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0742 Oldsmobile

The typical repair costs for addressing a P0742 code in an Oldsmobile vehicle can range from $200 to $600, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. For a more accurate estimate, it's recommended to consult with local auto repair shops.

What does this mean?

Tech Notes for P0742 Oldsmobile

When 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 recommended to change 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.



There is a factory service bulletin for the following Oldsmobile Models:

2001-2002 Oldsmobile Intrigue

2001-2003 Oldsmobile Silhouette

2001-2004 Oldsmobile Silhouette EXT

Oldsmobile Factory Service Bulletin OBDII Code P0742

When is the Code Detected?

When the Powertrain Control Module (PCM) no longer provides a ground path, the Torque Converter Clutch (TCC) solenoid valve de-energizes and apply fluid exhausts, releasing the TCC.
When the PCM detects low torque converter slip when the PCM commands the TCC OFF, then is sets the P0742 code.

Need more information about the P0742 Oldsmobile 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 Oldsmobile Code

1. What are the common symptoms of OBDII code P0742 in an Oldsmobile related to the Torque Converter Clutch Circuit Stuck On?

- Common symptoms include engine stalling at stops, decreased fuel efficiency, and the transmission slipping or overheating.

2. What are the possible causes of OBDII code P0742 in an Oldsmobile indicating the Torque Converter Clutch Circuit Stuck On?

- Possible causes include a faulty torque converter clutch solenoid, a defective torque converter, low transmission fluid levels, or issues with the transmission control module.

3. How can I diagnose the OBDII code P0742 in my Oldsmobile that points to the Torque Converter Clutch Circuit Stuck On?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, and conducting a thorough inspection of the torque converter and related components.

4. Is it safe to continue driving my Oldsmobile with OBDII code P0742 related to the Torque Converter Clutch Circuit Stuck On?

- It is not recommended to drive the vehicle with this code as it can lead to further damage to the transmission and potentially compromise safety.

5. Can I reset the OBDII code P0742 in my Oldsmobile indicating the Torque Converter Clutch Circuit Stuck On without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent recurring issues and potential transmission damage.

6. What are some repair tips for resolving OBDII code P0742 in an Oldsmobile with the Torque Converter Clutch Circuit Stuck On?

- Repair tips may include replacing the torque converter clutch solenoid, inspecting and repairing damaged wiring, ensuring proper transmission fluid levels, and updating the transmission control module software.

7. How much does it typically cost to repair OBDII code P0742 in an Oldsmobile related to the Torque Converter Clutch Circuit Stuck On?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay between $200 to $800 for parts and labor.

8. Are there any preventive measures to avoid encountering OBDII code P0742 in an Oldsmobile due to the Torque Converter Clutch Circuit Stuck On?

- Regular transmission fluid checks and changes, timely maintenance of the torque converter components, and addressing any transmission-related issues promptly can help prevent this code from appearing.

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