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Code

P0740

Transmission

Torque converter clutch circuit malfunction

The torque converter clutch circuit has a fault.

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Most likely causes

Faulty TCC solenoid
Wiring fault
Worn converter

Symptoms you may notice

Higher highway RPM
Worse economy

Checks to run

Test the solenoid
Check wiring
Verify lock-up

Tools you may need

Multimeter OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Transmission

Transmission control system malfunction

Transmission range sensor (PRNDL) circuit malfunction

Output shaft speed sensor circuit malfunction

Incorrect gear ratio

Torque converter clutch circuit stuck off

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