Torque Converter Clutch Stuck On
The P0742 code indicates that the torque converter clutch (TCC) is stuck in the engaged position, meaning the clutch is not releasing when commanded. This can cause the engine to stall at idle, harsh shifting, or poor fuel economy. The TCC solenoid or valve body may be stuck, or there could be a wiring issue.
01. Most Common Causes
- Faulty torque converter clutch solenoid
- Stuck TCC valve in the valve body
- Wiring or connector issues in the TCC circuit
- Internal transmission damage
02. Symptoms You Will Notice
- Engine stalls when coming to a stop
- Harsh or delayed shifts
- Poor fuel economy
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Scan for codes and check freeze frame data.
Step 2: Inspect transmission fluid level and condition.
Step 3: Test TCC solenoid resistance and power/ground circuits.
Step 4: Perform a TCC solenoid activation test with a scan tool.
Step 5: Check for mechanical binding in the valve body.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The TCC stuck on can cause the engine to stall, especially at low speeds, leading to a potential accident. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost varies from $150 to $400 depending on the cause. A simple solenoid replacement may be on the lower end, while valve body or transmission work can be higher.