Diagnostic trouble code
P0740
Powertrain
Unverified
Powertrain (P)
Transmission
Torque converter clutch circuit malfunction
The torque converter clutch circuit has a fault.
What P0740 means
The torque converter clutch circuit has a fault.
Symptoms you may notice
- Higher highway RPM
- Worse economy
Possible causes
- Faulty TCC solenoid
- Wiring fault
- Worn converter
Causes are listed from most to least likely for this code. Confirm the actual cause with the diagnostic checks before replacing parts.
Checks to run
- Test the solenoid
- Check wiring
- Verify lock-up
Tools you may need
Multimeter
OBD-II scanner
Related codes
More Transmission codes →
P0700
Transmission control system malfunction
P0705
Transmission range sensor (PRNDL) circuit malfunction
P0706
Transmission range sensor range / performance
P0715
Input shaft / turbine speed sensor circuit malfunction
P0716
Input shaft speed sensor range / performance
P0717
Input shaft speed sensor no signal
Verification and editorial notes
UnverifiedThis page has not been technically verified yet. Confirm the diagnosis and measurements in the workshop manual for your vehicle.
Diagnose before replacing. A diagnostic trouble code identifies the circuit or
system the control unit flagged. It does not prove that a particular part has failed. Confirm
the cause with the measurements and checks above, and follow the workshop manual for your exact
engine before replacing parts or clearing codes.