P1740 on Ford
Torque Converter Clutch System Fault (Manufacturer Specific)
P1740 on Ford vehicles indicates torque converter clutch system fault (manufacturer specific). Au7o has documented this code across 1 Ford model — most commonly on F-150. This is a manufacturer-specific transmission code indicating a fault in the torque converter clutch (TCC) system. The torque converter clutch mechanically locks the engine to the transmission at cruising speeds to reduce slippage and improve fuel economy; the computer controls it with a solenoid and monitors whether it locks and unlocks correctly. This code sets when the system doesn't behave as expected — for example, the clutch fails to lock, slips, or the control circuit is faulty. Symptoms can include shudder, poor fuel economy, higher RPM at cruise, or a transmission that won't lock up. Typical repair costs on Ford range from $1,800 to $3,500, depending on the specific model and root cause.
Common Causes of P1740
- •Faulty torque converter clutch (TCC) solenoid
- •Worn or failing torque converter
- •Low, dirty, or contaminated transmission fluid
- •Valve body wear or stuck valve
- •Damaged TCC solenoid wiring/connector
- •Internal hydraulic pressure loss
- •Faulty transmission control module (TCM)
P1740 on Ford by Model
Ford F-150(1 issue)
- 4R70W / 4R75W Automatic Transmission Failure — No Reverse, Loss of Forward Gears, and Slipping1997-2008
The 4R70W (and later 4R75W/4R75E) 4-speed automatic behind the 4.2L V6 and 4.6L/5.4L V8s is prone to several high-mileage failures: a broken reverse (cast) band that produces a loud POP and loss of reverse; a cracked forward-clutch drum snap-ring groove on 2005+ units causing loss of ALL forward gears while reverse still works; worn overdrive band and clutches causing slipping; and solenoid-body/servo wear causing harsh or erratic shifts. Failures accelerate under towing/heavy loads and when fluid changes are neglected.
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View P1740 across all makes →Frequently Asked Questions
What does P1740 mean on Ford?▼
P1740 stands for "Torque Converter Clutch System Fault (Manufacturer Specific)." This is a manufacturer-specific transmission code indicating a fault in the torque converter clutch (TCC) system. The torque converter clutch mechanically locks the engine to the transmission at cruising speeds to reduce slippage and improve fuel economy; the computer controls it with a solenoid and monitors whether it locks and unlocks correctly. This code sets when the system doesn't behave as expected — for example, the clutch fails to lock, slips, or the control circuit is faulty. Symptoms can include shudder, poor fuel economy, higher RPM at cruise, or a transmission that won't lock up. On Ford specifically, this code is documented across 1 model.
What causes P1740 on Ford vehicles?▼
Common causes on Ford: Faulty torque converter clutch (TCC) solenoid, Worn or failing torque converter, Low, dirty, or contaminated transmission fluid, Valve body wear or stuck valve, Damaged TCC solenoid wiring/connector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1740 on a Ford?▼
Repair costs on Ford range from $1,800 to $3,500, depending on the specific model and root cause.
Which Ford models have P1740 documented?▼
Au7o has documented P1740 on 1 Ford model: F-150.