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AutoCodes – Chevrolet – P0742 2018 Chevrolet Silverado

P0742 2018 Chevrolet Silverado Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance

Quick Answer

The Torque Converter Clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. 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 2018 Chevrolet Silverado indicates Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance.
Common causes
Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
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.
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Code Popularity 534
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 30, 2022
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Code P0742 2018 Chevrolet Silverado Description

The Torque Converter Clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. The TCC pressure control solenoid is a normally low-pressure control solenoid. The TCC pressure control solenoid regulates the transmission fluid to the TCC regulator valve in the lower valve body and the TCC control valve in the pump cover. When vehicle operating conditions are appropriate to apply the converter clutch, the Transmission Control Module (TCM) will increase TCC pressure control current flow (duty cycle) to the TCC solenoid. The TCC pressure control solenoid directs fluid pressure to move the TCC control valve to the apply position and moves the TCC regulator apply valve to the regulating position. The TCC regulator valve regulates TCC apply fluid pressure proportional to TCC solenoid pressure. When the TCC is fully applied, the engine is coupled directly to the transmission. TCC release is accomplished by the Transmission Control Module decreasing current flow to the TCC pressure control solenoid. This results in decreasing the applied pressure which allows the TCC control valve to move to the release position. The Transmission Control Module calculates torque converter slip speed based on engine speed and transmission input shaft speed.
The Diagnostic Trouble Code (DTC) will be set when the CM detects the TCC slip between −50 and +13 RPM for 6 s when the TCC is commanded OFF.
OBDII Code P0742 2018 Chevrolet Silverado - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance - AutoCodes.com
P0742 2018 Chevrolet Silverado Code - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance
What does this mean?

What are the Possible Causes of the DTC P0742 2018 Chevrolet Silverado?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty Control Solenoid Valve Assembly
  • Control Solenoid Valve Assembly harness is open or shorted
  • Control Solenoid Valve Assembly circuit poor electrical connection
  • Transmission internal mechanical problem

How to Fix the DTC P0742 2018 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0742 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0742 2018 Chevrolet Silverado code?

Need more information on how to fix the P0742 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the 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.

Frequently Asked Questions about P0742 2018 Chevrolet Silverado Code

1. What does the OBD-II code P0742 mean on a 2018 Chevrolet Silverado?

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

2. What are the common symptoms of code P0742 in a 2018 Chevy Silverado?

Symptoms may include poor acceleration, stalling at low speeds, reduced fuel efficiency, and the Check Engine Light being illuminated.

3. What causes the P0742 code to trigger in a 2018 Chevrolet Silverado?

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

4. Can driving with the P0742 code damage my 2018 Chevy Silverado?

Yes, driving with this code can cause further transmission damage or unsafe driving conditions, especially if the vehicle stalls unexpectedly.

5. How do I fix the P0742 code on a 2018 Chevrolet Silverado?

Repairs may involve replacing the TCC solenoid, flushing and refilling the transmission fluid, fixing wiring issues, or addressing internal transmission problems.

6. How much does it cost to repair the P0742 code on a 2018 Chevy Silverado?

Repair costs can range from $150 to over $2,500 depending on whether the issue is a simple solenoid replacement or a major transmission repair.

7. Can low or dirty transmission fluid cause the P0742 code?

Yes, low or contaminated transmission fluid can cause the TCC to malfunction, leading to the P0742 code.

8. How is the P0742 code diagnosed on a 2018 Chevrolet Silverado?

A mechanic will use a scan tool to confirm the code, inspect the transmission fluid, check the TCC solenoid and wiring, and test the transmission's hydraulic and mechanical performance.

9. Can I clear the P0742 code by disconnecting the battery?

Disconnecting the battery may temporarily clear the code, but it will not fix the underlying issue, and the code will likely return.

10. Is the P0742 code specific to the 2018 Chevrolet Silverado?

No, the P0742 code can appear on many vehicles, but the specific causes and fixes may vary depending on the make, model, and year.

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