P0740 on Genesis
Torque Converter Clutch Circuit Malfunction
P0740 on Genesis vehicles indicates torque converter clutch circuit malfunction. Au7o has documented this code across 1 Genesis model — most commonly on G70. 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.
Common Causes of P0740
- •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
P0740 on Genesis by Model
Genesis G70(1 issue)
- Torque Converter Internal Rivet Damage — Scratching Noise / Low-Speed Stall (Campaign T27G)2023
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, and the fault can set a torque-converter-clutch code. 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.
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View P0740 across all makes →Frequently Asked Questions
What does P0740 mean on Genesis?▼
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 Genesis specifically, this code is documented across 1 model.
What causes P0740 on Genesis vehicles?▼
Common causes on Genesis: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0740 on a Genesis?▼
Repair costs vary widely depending on the root cause and specific Genesis model.
Which Genesis models have P0740 documented?▼
Au7o has documented P0740 on 1 Genesis model: G70.