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

Quick Answer

The P0742 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates a problem with the Torque Converter Clutch (TCC) system, specifically that it is stuck in the "on" position. Common causes include Malfunctioning TCC solenoid, Faulty 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 2017 Chevrolet Silverado indicates Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance.
Common causes
Common causes include Malfunctioning TCC solenoid, Faulty 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 12, 2024
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Code P0742 2017 Chevrolet Silverado Description

The P0742 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates a problem with the Torque Converter Clutch (TCC) system, specifically that it is stuck in the "on" position. The torque converter clutch is a critical component of the automatic transmission system and is responsible for connecting the engine's crankshaft to the transmission's input shaft, improving fuel efficiency and reducing heat generation. When the TCC is stuck on, it can lead to a variety of performance issues and potential long-term effects if left unresolved.

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

Common Causes of P0742 2017 Chevrolet Silverado

  1. Malfunctioning TCC solenoid
  2. Faulty TCC valve
  3. Low transmission fluid levels
  4. Contaminated transmission fluid
  5. Internal transmission damage

Symptoms of P0742 2017 Chevrolet Silverado

  1. Decreased fuel efficiency
  2. Rough or delayed shifting
  3. Engine stalling at idle
  4. Transmission overheating
  5. Transmission slippage

How to Fix P0742 2017 Chevrolet Silverado

  1. Diagnose the issue by using a scan tool to check for the specific trouble code and perform a thorough inspection of the TCC system.
  2. Inspect the TCC solenoid and valve for any signs of wear or damage, replacing them if necessary.
  3. Check the transmission fluid levels and quality, topping off or replacing the fluid if it is low or contaminated.
  4. Test drive the vehicle after repairs to ensure that the TCC is functioning properly and that the symptoms have been resolved.

Cost to Fix P0742 2017 Chevrolet Silverado

The typical repair costs for addressing a P0742 code on a 2017 Chevrolet Silverado can range from $200 to $600, depending on the extent of the repairs needed. This estimate includes parts and labor, but actual costs may vary based on the specific diagnosis time and labor rates at auto repair shops. It is recommended to consult with local repair shops to get a more accurate cost estimate for this issue.

What does this mean?

Tech Notes for P0742 2017 Chevrolet Silverado

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.

Frequently Asked Questions about P0742 2017 Chevrolet Silverado Code

1. What does the OBDII code P0742 mean for a 2017 Chevrolet Silverado?

P0742 indicates that the Torque Converter Clutch (TCC) system is stuck on or there is an issue with the transmission's hydraulic or mechanical performance.

2. What are the common symptoms of code P0742 in a 2017 Chevrolet Silverado?

Symptoms may include poor fuel economy, erratic shifting, the vehicle stalling when coming to a stop, and the check engine light being illuminated.

3. What causes the P0742 code to appear in a 2017 Chevrolet Silverado?

Common causes include a faulty torque converter clutch solenoid, transmission fluid issues (low, dirty, or contaminated), a damaged torque converter, or internal transmission problems.

4. Can driving with a P0742 code damage the transmission in my 2017 Silverado?

Yes, continued driving with this code can lead to overheating or further damage to the transmission, so it’s recommended to address the issue promptly.

5. How is the P0742 code diagnosed on a 2017 Chevrolet Silverado?

A mechanic will typically use a scan tool to check for related codes, inspect the transmission fluid, test the TCC solenoid, and evaluate the transmission’s hydraulic pressure.

6. Can low transmission fluid cause the P0742 code in my Silverado?

Yes, low or contaminated transmission fluid can cause this code by affecting the operation of the torque converter clutch and overall hydraulic performance.

7. What repairs might fix the P0742 code on a 2017 Chevrolet Silverado?

Repairs may include replacing the TCC solenoid, flushing and refilling the transmission fluid, repairing or replacing the torque converter, or addressing internal transmission issues.

8. How much does it cost to fix a P0742 code on a 2017 Chevrolet Silverado?

Repair costs can vary widely, from $150 to $500 for solenoid or fluid replacement, to over $1,000 for torque converter or transmission repairs.

9. Can I reset the P0742 code without fixing the problem?

While you can clear the code with a scan tool, it will likely return unless the underlying issue is resolved.

10. Is the P0742 code a common problem for the 2017 Chevrolet Silverado?

It’s not extremely common, but it can occur due to wear and tear on the transmission components or issues with fluid maintenance. Regular servicing can reduce the likelihood of this code appearing.

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