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AutoCodes – Chevrolet – P0742 Chevrolet

P0742 Chevrolet 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 Chevrolet 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 88,502
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Jul 30, 2022
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Code P0742 Chevrolet 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 Chevrolet - Torque Converter Clutch System Stuck On Or Transmission Hydraulic/Mechanical Performance - AutoCodes.com
P0742 Chevrolet 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 Chevrolet?

  • 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 Chevrolet?

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.

There is a factory service bulletin for the following Chevrolet Models:
2001 Chevrolet Lumina
2001-2005 Chevrolet Venture
2001-2005 Chevrolet Venture EXT
2001-2005 Chevrolet Venture 4WD
2001-2007 Chevrolet Monte Carlo
2001-2008 Chevrolet Impala
2001-2008 Chevrolet Lumina (Export Only)
2005-2008 Chevrolet Uplander
2005-2008 Chevrolet Uplander EXT
2005-2008 Chevrolet Uplander 4WD
Chevrolet Factory Service Bulletin OBDII Code P0742





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0742 Chevrolet 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.

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Information for Specific Chevrolet Models

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 Chevrolet Code

1. What are common symptoms of OBDII code P0742 in a Chevrolet related to the torque converter clutch system?

The common symptoms include engine stalling at stops, decreased fuel efficiency, delayed or harsh shifting, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P0742 in a Chevrolet?

The code P0742 in a Chevrolet can be triggered by issues such as a faulty torque converter clutch solenoid, damaged wiring or connectors, low transmission fluid levels, or a failing torque converter.

3. How can I diagnose the OBDII code P0742 in a Chevrolet myself?

You can diagnose the code P0742 by using an OBDII scanner to retrieve the specific error code, checking the transmission fluid level and condition, inspecting the wiring and connectors related to the torque converter clutch, and performing a thorough visual inspection.

4. What are the repair options for OBDII code P0742 in a Chevrolet?

Repair options for code P0742 may include replacing the torque converter clutch solenoid, repairing or replacing damaged wiring, ensuring proper transmission fluid levels and quality, or replacing the torque converter if necessary.

5. Can driving with OBDII code P0742 in a Chevrolet cause further damage?

Continuing to drive with code P0742 may lead to decreased fuel efficiency, potential transmission overheating, and further damage to the transmission components over time. It is recommended to address the issue promptly.

6. How much does it typically cost to repair OBDII code P0742 in a Chevrolet?

The cost of repairing code P0742 in a Chevrolet can vary depending on the specific cause of the issue, the labor rates in your area, and whether any transmission components need replacement. It is advisable to consult a mechanic for an accurate estimate.

7. Are there any preventive maintenance tips to avoid OBDII code P0742 in a Chevrolet?

To prevent OBDII code P0742 in a Chevrolet, it is recommended to perform regular transmission fluid checks and changes, address any transmission issues promptly, and avoid harsh driving habits that can strain the transmission components.

8. Can I continue driving my Chevrolet with OBDII code P0742?

While it is possible to drive with code P0742, it is not recommended as it can lead to potential transmission damage over time. It is best to address the underlying issue as soon as possible to prevent further complications.

9. Is OBDII code P0742 specific to Chevrolet vehicles only?

No, OBDII code P0742 related to the torque converter clutch system can occur in various vehicle makes and models, not limited to Chevrolet. The symptoms, causes, and repair procedures may differ slightly based on the manufacturer.

10. How long does it usually take to repair OBDII code P0742 in a Chevrolet?

The repair time for code P0742 in a Chevrolet can vary depending on the exact cause of the issue, the availability of parts, and the workload of the repair shop. In general, it may take a few hours to a full day to diagnose and repair the problem.

Discuss the causes and fixes for P0742 Chevrolet OBDII Code

Submit a New Comment

  • Is flushing and changing the transmission fluid the first step in discovering if the TCC needs replaced or transmission replaced or rebuilt?

    Reply to Comment

  • If you haven't change the fluid for while (over 1 year), you could start with that. I don't recommend flushing the transmission, sometimes that could cause other problems due to the chemicals used to flush it, I recommend just changing the fluid.

    Reply to Comment
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