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Greg
Greg, import technician
Category: Nissan
Satisfied Customers: 7024
Experience:  import Technician . Shop Owner ,. 27 years experience,
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What is po744 code and how do i fix it

Customer Question

what is po744 code and how do i fix it
Submitted: 7 years ago.
Category: Nissan
Expert:  Dan replied 7 years ago.

I'd recommend bringing this to a shop to have them properly diagnose the problem otherwise I would recommend replacing both the C and D solenoids. Let me know if you have questions, thanks.

 

P0744 TCC Servo Valve Function (Lockup) - With Automatic Transmission

Possible CausesSetting Conditions
  • Hydraulic control circuit has failed
  • Pressure control solenoid valve 'C' stuck "off"
  • Shift solenoid valve 'D' stuck "off"
  • Torque converter clutch

Customer: replied 7 years ago.
Relist: Incomplete answer.
Expert:  Dan replied 7 years ago.
How is this incomplete?
Customer: replied 7 years ago.
could the transmission mound failuer cause the circuit to fail
Expert:  Dan replied 7 years ago.
No, it could not. Let me know if you have more questions. Thanks
Customer: replied 7 years ago.
Relist: there is no proess for testing the circuit to fine out which pair of trnasmission is broke.
there is no proess for testing the circuit to fine out which pair of trnasmission is broke
Expert:  Greg replied 7 years ago.
Dan is right in what he said , i've seen this problem many times due to bad connection at the harness down to the transmission , also seen many that have stuck open torque converter clutch solenoid valve , to check this you will have to remove transmission oil pan
to test give battery voltage to solenoid valve you should hear a clicking sound if not replace valve