P0740 on Acura
Torque Converter Clutch Circuit Malfunction
P0740 on Acura vehicles indicates torque converter clutch circuit malfunction. Au7o has documented this code across 2 Acura models — most commonly on Integra, MDX. 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. Typical repair costs on Acura range from $150 to $3,500, depending on the specific model and root cause.
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 Acura by Model
Acura Integra(1 issue)
- 4-speed automatic: shift solenoid failure causes D4 light flash, missed shifts, and limp mode1994-1999
The Honda BAXA/MAXA 4-speed automatic in the Integra is notoriously sensitive to fluid condition and shift-solenoid contamination. Solenoid A/B failure causes flashing D4 light, harsh or missed 2-3/3-4 shifts, loss of power in D4/D3, and sometimes speedometer drop-out. Integra often faces delayed or missed shifts and manual downshifting difficulties in automatic transmissions. Shifting problems in the 1998 Integra's automatic transmission can stem from a clogged transmission filter or screen restricting fluid flow. This causes poor hydraulic pressure, leading to missed 4th gear shifts and failure to downshift. While driving, the D4 suddenly lost almost all power, wouldn't shift, and the speedometer stopped working. Codes returned were Automatic Transaxle FI A circuit failure and ELD error.
Acura MDX(1 issue)
- ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting2016-2020
Third-generation MDX models with the ZF 9-speed automatic suffer from torque converter shudder during light throttle acceleration between 30-50 mph. The lockup clutch in the torque converter vibrates as it engages, creating a sensation similar to driving over rumble strips that many owners mistake for an engine misfire.
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What does P0740 mean on Acura?▼
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 Acura specifically, this code is documented across 2 models.
What causes P0740 on Acura vehicles?▼
Common causes on Acura: 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 Acura?▼
Repair costs on Acura range from $150 to $3,500, depending on the specific model and root cause.
Which Acura models have P0740 documented?▼
Au7o has documented P0740 on 2 Acura models: Integra, MDX.