P0740 — Torque Converter Clutch Circuit Malfunction
Category: Powertrain Severity: Medium
Updated:
DTC code P0740 means: Torque Converter Clutch Circuit Malfunction. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include faulty torque converter clutch (TCC) solenoid, low/dirty transmission fluid and wiring/connector issue; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Faulty torque converter clutch (TCC) solenoid
- Low/dirty transmission fluid
- Wiring/connector issue
- Faulty TCM
Symptoms
- Harsh shifts
- Transmission slips
- Limp mode
How to diagnose it step by step
- Check ATF level and condition.
- Check the transmission connector.
- Measure the TCC solenoid.
- Replace the solenoid.
How to fix it
Check the transmission fluid level/condition and the solenoids.
Estimated repair cost
Solenoid: $60–250 + labor.
Frequently asked questions
What does DTC code P0740 mean?
Torque Converter Clutch Circuit Malfunction.
Is code P0740 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0740?
Yes, carefully; fuel consumption will increase.
Related codes
P0741 P0743 P0744 P0735 P0734 P0733 P0732 P0731 P0730 P0750
Refine by car make
- Audi P0740: TCC solenoid or transmission fluid.
- BMW P0740: Torque converter solenoid or low fluid.
- Citroën P0740: Torque converter solenoid or fluid.
- Ford P0740: TCC solenoid or transmission fluid level.
- Honda P0740: Torque converter solenoid.
- Mercedes-Benz P0740: Torque converter solenoid.
- Nissan P0740: Torque converter solenoid.
- Opel P0740: TCC solenoid or fluid.
- Peugeot P0740: Torque converter solenoid or fluid.
- Renault P0740: Torque converter solenoid.
- Toyota P0740: TCC solenoid or fluid.
- Volkswagen P0740: TCC solenoid or transmission fluid.
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