P0742 on Chevrolet
Torque Converter Clutch Circuit Stuck On
P0742 on Chevrolet vehicles indicates torque converter clutch circuit stuck on. Au7o has documented this code across 3 Chevrolet models — most commonly on Silverado 1500, Suburban, Tahoe. P0742 means the torque converter clutch (TCC) circuit is stuck on, meaning the lockup clutch that mechanically links the engine to the transmission stays engaged when it should release. The computer commands the clutch on and off, and when it detects the converter clutch remaining applied, it sets this code. The classic symptom is the engine stalling when coming to a stop, similar to driving a manual without pushing the clutch in, along with possible harsh shifts or poor fuel economy. It points to a hydraulic or solenoid problem inside the transmission rather than the engine. Typical repair costs on Chevrolet range from $200 to $4,500, depending on the specific model and root cause.
Common Causes of P0742
- •Stuck or failed torque converter clutch solenoid
- •Stuck valve in the valve body (TCC apply valve)
- •Contaminated or degraded transmission fluid
- •Internal transmission hydraulic leak holding the clutch on
- •Wiring or connector fault to the TCC solenoid
- •Faulty torque converter
- •Dirty or clogged transmission filter
P0742 on Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- 8/10-Speed Transmission Shudder2015-2023
Both the 8-speed and 10-speed automatic transmissions can develop a shudder during light acceleration. This torque converter clutch issue is widespread across GM trucks. Multiple TSBs have been issued addressing this concern.
Chevrolet Suburban(1 issue)
- 8L90 Transmission Shudder2015-2020
Same 8L90 torque converter shudder as Tahoe/Silverado/Escalade. Light throttle shudder between 25-50 mph. GM Customer Satisfaction Program 18302 extends coverage to 6yr/100k.
Chevrolet Tahoe(2 issues)
- 10L80 10-Speed Transmission Harsh Shifting2021-2025
The 2021+ Tahoe uses the GM 10L80 10-speed with reports of harsh shifting, delayed engagement, and shift hunting between gears. GM has released multiple TCM calibration updates. The transmission requires DEXRON ULV fluid (NOT DEXRON HP). Most shift quality issues are resolved with the latest software calibration.
- 8L90 8-Speed Transmission Shudder2015-2020
The 2015-2020 Tahoe uses the GM 8L90 8-speed automatic with the same widespread torque converter shudder affecting Silverado and Escalade. Shudder occurs at light throttle between 25-50 mph. Root cause is torque converter clutch material contaminating the fluid. GM extended warranty to 6 years/100,000 miles under Customer Satisfaction Program 18302.
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View P0742 across all makes →Frequently Asked Questions
What does P0742 mean on Chevrolet?▼
P0742 stands for "Torque Converter Clutch Circuit Stuck On." P0742 means the torque converter clutch (TCC) circuit is stuck on, meaning the lockup clutch that mechanically links the engine to the transmission stays engaged when it should release. The computer commands the clutch on and off, and when it detects the converter clutch remaining applied, it sets this code. The classic symptom is the engine stalling when coming to a stop, similar to driving a manual without pushing the clutch in, along with possible harsh shifts or poor fuel economy. It points to a hydraulic or solenoid problem inside the transmission rather than the engine. On Chevrolet specifically, this code is documented across 3 models.
What causes P0742 on Chevrolet vehicles?▼
Common causes on Chevrolet: Stuck or failed torque converter clutch solenoid, Stuck valve in the valve body (TCC apply valve), Contaminated or degraded transmission fluid, Internal transmission hydraulic leak holding the clutch on, Wiring or connector fault to the TCC solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0742 on a Chevrolet?▼
Repair costs on Chevrolet range from $200 to $4,500, depending on the specific model and root cause.
Which Chevrolet models have P0742 documented?▼
Au7o has documented P0742 on 3 Chevrolet models: Silverado 1500, Suburban, Tahoe.