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Engine-Codes – Saturn – P0742 Saturn

P0742 Saturn Code - Torque Converter Clutch Circuit Stuck On

Quick Answer

The P0742 diagnostic trouble code (DTC) for Saturn vehicles refers to the Torque Converter Clutch Circuit being stuck on. Common causes include Malfunctioning TCC solenoid, Electrical issues in the TCC circuit, Faulty transmission control module (TCM). 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 Saturn indicates Torque Converter Clutch Circuit Stuck On.
Common causes
Common causes include Malfunctioning TCC solenoid, Electrical issues in the TCC circuit, Faulty transmission control module (TCM).
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 09, 2024
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Code P0742 Saturn Description

The P0742 diagnostic trouble code (DTC) for Saturn vehicles refers to the Torque Converter Clutch Circuit being stuck on. The torque converter is a critical component of an automatic transmission system that transfers power from the engine to the transmission. It is designed to allow the engine to continue running while the vehicle is stopped and to smoothly transition between gears. The torque converter clutch (TCC) is responsible for locking the torque converter in place, improving fuel efficiency and reducing heat generation. When the TCC circuit is stuck on, it means that the TCC is engaged at all times, even when it should be disengaged. This can lead to a variety of issues that can affect the vehicle's performance and overall functionality.

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

Common Causes of P0742 Saturn

  1. Malfunctioning TCC solenoid
  2. Electrical issues in the TCC circuit
  3. Faulty transmission control module (TCM)
  4. Low transmission fluid level
  5. Mechanical issues in the transmission

Symptoms of P0742 Saturn

  1. Decreased fuel efficiency
  2. Rough or harsh shifting
  3. Jerking or hesitation during gear changes
  4. Overheating transmission
  5. Illumination of the check engine light

How to Fix P0742 Saturn

  1. Diagnose the issue by using a scan tool to retrieve the DTC and inspecting the TCC solenoid and circuit for any faults.
  2. Test the TCC solenoid to ensure it is functioning properly and replace it if necessary.
  3. Check the transmission control module (TCM) for any faults or errors and perform any necessary repairs or replacements.
  4. Inspect the transmission fluid level and quality, topping it off or performing a fluid flush if needed.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0742 Saturn

The typical repair costs for addressing a P0742 code on a Saturn vehicle can range from $200 to $600, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Most auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It's advisable to check local rates for a more precise estimate before proceeding with the repairs.

What does this mean?

Tech Notes for P0742 Saturn

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 Saturn Models:

2005-2006 Saturn Relay

2005-2006 Saturn Relay AWD

2005-2007 Saturn Relay EXT

Saturn 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.

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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.

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