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Engine-Codes – GMC – P0742 2017 GMC Sierra

P0742 2017 GMC Sierra Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Quick Answer

The P0742 diagnostic trouble code (DTC) for a 2017 GMC Sierra pertains to the Torque Converter Clutch (TCC) system being stuck on or indicating transmission hydraulic/mechanical performance issues. Common causes include Malfunctioning TCC solenoid, Faulty torque converter clutch, 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 2017 GMC Sierra indicates Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance.
Common causes
Common causes include Malfunctioning TCC solenoid, Faulty torque converter clutch, 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 11, 2024
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Code P0742 2017 GMC Sierra Description

The P0742 diagnostic trouble code (DTC) for a 2017 GMC Sierra pertains to the Torque Converter Clutch (TCC) system being stuck on or indicating transmission hydraulic/mechanical performance issues. The torque converter is a critical component in an automatic transmission system that transfers power from the engine to the transmission. The Torque Converter Clutch is responsible for locking the torque converter in place, improving fuel efficiency and preventing slippage.

OBDII Code P0742 2017 GMC Sierra - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
P0742 2017 GMC Sierra Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Common Causes of P0742 2017 GMC Sierra

  1. Malfunctioning TCC solenoid
  2. Faulty torque converter clutch
  3. Low transmission fluid levels
  4. Internal transmission damage
  5. Electrical issues within the transmission system

Symptoms of P0742 2017 GMC Sierra

  1. Harsh or delayed shifting
  2. Decreased fuel efficiency
  3. Engine stalling
  4. Decreased acceleration
  5. Illuminated Check Engine Light

How to Fix P0742 2017 GMC Sierra

  1. Diagnose the issue using a scan tool to confirm the P0742 code and conduct further testing to identify the specific cause.
  2. Inspect the TCC solenoid and torque converter clutch for any signs of damage or malfunction and replace if necessary.
  3. Check and replenish transmission fluid levels to ensure proper lubrication and operation.
  4. Conduct a thorough inspection of the transmission system for any internal damage and repair as needed.
  5. Clear the DTC and test drive the vehicle to ensure proper functioning of the TCC system.

Cost to Fix P0742 2017 GMC Sierra

The cost of repairing a P0742 code can vary depending on the specific cause of the issue and the extent of repairs needed. On average, the cost of parts for this repair can range from $200 to $500, while labor costs can range from $300 to $800. Overall, the total repair cost for addressing a P0742 code typically falls within the range of $500 to $1300. It is important to note that these estimates are approximate, and actual costs may vary based on factors such as the location of the repair shop, the vehicle's make and model, and the availability of parts. It is advisable to consult with a professional mechanic for a more accurate cost estimate based on your specific situation.

What does this mean?

Tech Notes for P0742 2017 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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