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Engine-Codes – GMC – P0742 2016 GMC Sierra

P0742 2016 GMC Sierra Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Quick Answer

The P0742 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the torque converter clutch (TCC) system is stuck on or that there is a malfunction in the transmission's hydraulic or mechanical performance. Common causes include Faulty torque converter clutch solenoid, Malfunctioning torque converter, 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 2016 GMC Sierra indicates Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance.
Common causes
Common causes include Faulty torque converter clutch solenoid, Malfunctioning torque converter, 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 14, 2024
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Code P0742 2016 GMC Sierra Description

The P0742 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the torque converter clutch (TCC) system is stuck on or that there is a malfunction in the transmission's hydraulic or mechanical performance. The torque converter clutch is responsible for connecting the engine to the transmission, allowing for smooth shifting and improved fuel efficiency. When this system is stuck on, it can lead to various issues with the vehicle's performance.

OBDII Code P0742 2016 GMC Sierra - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 2016 GMC Sierra Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Common Causes of P0742 2016 GMC Sierra

  1. Faulty torque converter clutch solenoid
  2. Malfunctioning torque converter
  3. Low transmission fluid levels
  4. Damaged transmission control module

Symptoms of P0742 2016 GMC Sierra

  1. Harsh shifting
  2. Decreased fuel efficiency
  3. Engine stalling at idle
  4. Transmission slipping
  5. Illuminated check engine light

How to Fix P0742 2016 GMC Sierra

  1. Diagnose the issue by using a scan tool to retrieve the trouble codes and inspecting the TCC system components.
  2. Check the transmission fluid level and quality, topping up or replacing it if necessary.
  3. Test the torque converter clutch solenoid and torque converter for proper operation, replacing them if faulty.
  4. Inspect the transmission control module for any damage or malfunctions, repairing or replacing it as needed.
  5. Clear the trouble codes, reset the vehicle's computer, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0742 2016 GMC Sierra

The typical repair costs for addressing a P0742 code can range from $200 to $800, depending on the specific components that need to be replaced and the labor costs involved. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as the vehicle's make and model, engine type, and location can also impact the overall repair costs.

What does this mean?

Tech Notes for P0742 2016 GMC Sierra

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, remove 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.

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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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