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Engine-Codes – GMC – P0742 2015 GMC Sierra

P0742 2015 GMC Sierra Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Quick Answer

The P0742 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Torque Converter Clutch (TCC) system being stuck on or experiencing issues with transmission hydraulic/mechanical performance. Common causes include Faulty TCC solenoid, Malfunctioning TCC valve, 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 2015 GMC Sierra indicates Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance.
Common causes
Common causes include Faulty TCC solenoid, Malfunctioning TCC valve, 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 13, 2024
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Code P0742 2015 GMC Sierra Description

The P0742 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Torque Converter Clutch (TCC) system being stuck on or experiencing issues with transmission hydraulic/mechanical performance. The torque converter is a critical component in an automatic transmission system that transfers power from the engine to the transmission. The TCC is responsible for locking the torque converter when the vehicle reaches a certain speed, improving fuel efficiency and reducing heat buildup in the transmission.

OBDII Code P0742 2015 GMC Sierra - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 2015 GMC Sierra Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Common Causes of P0742 2015 GMC Sierra

  1. Faulty TCC solenoid
  2. Malfunctioning TCC valve
  3. Low transmission fluid levels
  4. Internal transmission damage
  5. Electrical issues in the TCC system

Symptoms of P0742 2015 GMC Sierra

  1. Decreased fuel efficiency
  2. Harsh or delayed shifting
  3. Transmission overheating
  4. Illuminated check engine light
  5. Transmission slipping

How to Fix P0742 2015 GMC Sierra

  1. Diagnose the issue using a scan tool to confirm the P0742 code and identify the specific cause of the problem.
  2. Inspect the TCC solenoid and valve for any signs of damage or malfunction. Replace if necessary.
  3. Check transmission fluid levels and quality. Top up or perform a fluid flush if needed.
  4. Inspect internal transmission components for any damage or wear. Repair or replace as needed.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0742 2015 GMC Sierra

The typical repair costs for addressing a P0742 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. On average, the repair costs for this type of transmission problem can range from $300 to $800, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to consult with a trusted mechanic or repair shop to get a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P0742 2015 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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