P0740 on Chevrolet: How to Diagnose & Fix
Torque Converter Clutch Circuit Malfunction
7 Chevrolet models · 7 documented issues · 3 critical · $150-$4,500 repair
P0740 on Chevrolet by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Shudder during light acceleration
- Vibration at 25-50 mph
- Harsh shifts
- Hesitation when accelerating
- Shudder goes away under heavy throttle
How to Fix
Perform transmission fluid flush with GM-approved fluid and friction modifier additive. GM extended warranty coverage for some affected vehicles. Multiple fluid changes may be needed. Torque converter replacement in severe cases.
Sources for this issue (1)
The 8L45 8-speed automatic transmission can develop a shudder during light acceleration, typically between 25-50 mph. This is caused by torque converter clutch issues, similar to problems in other GM vehicles with this transmission family.
Common Symptoms
- Shudder during light acceleration
- Harsh or jerky shifts
- Vibration between 25-50 mph
- Transmission hesitation
- Clunk when shifting at low speeds
How to Fix
Perform transmission fluid flush with GM-approved fluid and friction modifier. Multiple fluid changes may help. GM has extended warranty coverage for some affected vehicles. In severe cases, torque converter replacement may be needed.
Sources for this issue (1)
The 8L90 and 8L45 8-speed automatic transmissions experience torque converter clutch shudder, causing vibration and shaking during gear changes. The issue is caused by the lock-up clutch slipping and chattering. This defect has been the subject of class action lawsuits against GM.
Common Symptoms
- Shuddering or shaking between 25-80 mph during gear shifts
- Vibration under light acceleration at 1000-1500 RPM
- Feeling like driving over rumble strips at highway speeds
- Sudden lurching or jerking during acceleration
How to Fix
Transmission fluid flush with updated Mobil 1 Synthetic LV ATF HP fluid. Torque converter replacement (may not permanently fix issue). TCM software reflash/update. Complete transmission replacement in severe cases.
Sources for this issue (1)
Transmission shuddering is common in Equinox models, typically caused by torque converter clutch issues or depleted transmission fluid additives. The shudder is most noticeable during light acceleration between 25-50 mph as the transmission shifts through 3rd-5th gears.
Common Symptoms
- Vibration or shudder during light acceleration
- Shaking between 25-50 mph
- Rough shifting between gears
- Transmission slipping sensation
- Check engine light with transmission codes
How to Fix
Transmission fluid flush and fill (3x flush procedure). Add transmission shudder fix additive (early intervention). Torque converter replacement. Complete transmission rebuild or replacement if severe.
Sources for this issue (1)
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.
Common Symptoms
- Shudder/vibration at light throttle 25-50 mph
- Feels like driving over rumble strips
- Harsh 1-2 or 2-3 shifts
- Transmission slipping
- Delayed Park to Drive engagement
How to Fix
Fluid exchange with Mobil 1 Synthetic LV ATF HP (GM 19417577) can resolve early-stage shudder. Severe cases need torque converter replacement. Check if VIN qualifies for Customer Satisfaction Program 18302.
Sources for this issue (1)
The C7 Corvette with the 7-speed manual or 8-speed automatic can develop an annoying driveline vibration/shudder at low speeds, particularly during gentle acceleration from a stop. The 7-speed manual uses a dual-mass flywheel that can develop chatter. The 8-speed automatic (8L90) shares the torque converter shudder issue with GM trucks. The transaxle-mounted differential and half-shafts can also contribute to vibrations.
Common Symptoms
- Shudder during gentle acceleration from stop
- Vibration at 20-40 mph under light throttle (8-speed)
- Clutch chatter in 1st gear (7-speed manual)
- Vibration through floor at highway cruise
- Clunk on tip-in/tip-out throttle
How to Fix
For 8-speed: same transmission fluid exchange with Mobil 1 LV ATF HP as other 8L90 vehicles. For 7-speed manual: dual-mass flywheel inspection/replacement, or conversion to single-mass flywheel with aftermarket clutch. Half-shaft inspection for worn CV joints. Some vibration at low speed is inherent to the C7 design.
Sources for this issue (1)
P0740 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0740 mean on a Chevrolet?
P0740 stands for "Torque Converter Clutch Circuit Malfunction." This code indicates a malfunction in the torque converter clutch (TCC) circuit of an automatic transmission. The torque converter clutch mechanically locks the engine to the transmission at cruising speed to improve fuel economy and reduce slippage, and it is engaged by a solenoid controlled by the transmission computer. The code sets when the computer detects an electrical problem with the clutch circuit or sees that the clutch is not engaging or holding as expected. Common signs include slipping, shuddering, poor fuel economy, or stalling when coming to a stop. On Chevrolet it is documented across 7 models: Silverado 1500, Colorado, Camaro, Equinox, Tahoe, Corvette, Suburban.
What are the most common causes of P0740?
The most common causes of P0740 are: Faulty torque converter clutch (TCC) solenoid, Low or contaminated transmission fluid, Wiring or connector fault in the TCC circuit, Worn or failing torque converter, Valve body wear or sticking valves, Internal transmission electrical short, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P0740 on a Chevrolet?
Published repair estimates on Chevrolet range from $150 to $4,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0740 on a different make?
View P0740 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.