P0740 on Genesis: How to Diagnose & Fix
Torque Converter Clutch Circuit Malfunction
1 Genesis model · 1 documented issue
P0740 on Genesis by model: symptoms, diagnosis and fix
Certain 2023 G70 2.0T models built between April 14, 2022 and June 14, 2022 can suffer internal rivet damage and cracks inside the torque converter. Symptoms are a scratching/grinding noise and, in rare cases, an engine stall at idle or creep speeds. Genesis addressed this with Service Campaign T27G (TSB 23-01-003G), which replaces the torque converter. Importantly, on these cars a stall should be checked against this campaign before any ECM is condemned.
Common Symptoms
- Scratching or grinding noise from the transmission area
- Engine stall at idle or creep speeds (rare)
How to Fix
Confirm the VIN and production date against Service Campaign T27G (TSB 23-01-003G). The remedy is replacement of the torque converter at no charge for affected vehicles. If you have a low-speed stall or scratching noise on a 2023 2.0T, have the dealer investigate this campaign first — do not let the ECM be replaced before the torque converter is ruled out.
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 Genesis?
P0740 stands for "Torque Converter Clutch Circuit Malfunction." This code indicates an electrical malfunction in the torque converter clutch (TCC) solenoid 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 open, short, or out-of-range condition in the TCC solenoid circuit. A clutch that is commanded on but slips or won't hold sets a separate code (P0741). Common signs include the converter not locking up (higher cruise RPM and poor fuel economy), a check engine light, or stalling when coming to a stop if the clutch stays applied. On Genesis it is documented across 1 model: G70.
What are the most common causes of P0740?
The most common causes of P0740 are: Faulty torque converter clutch (TCC) solenoid, Wiring or connector fault in the TCC circuit (open or short), Transmission case connector or internal harness damage, including fluid intrusion, Internal transmission electrical short, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P0740 on a Genesis?
Repair costs vary widely with the root cause and Genesis model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.