Powertrain
Generic/SAE
OBD-II Fault Code
P0744: Torque Converter Clutch Circuit Intermittent
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0744.
Transmission / driveline
Use this category to narrow your checks before replacing parts.
High
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What P0744 usually means
Torque Converter Clutch Circuit Intermittent.
Common symptoms
Check Engine light; Poor drivability or reduced fuel economy depending on fault; Harsh shifting, limp mode, slipping or delayed engagement possible
Likely causes
Low/dirty transmission fluid; Solenoid/valve body issue; Wiring fault; Internal transmission wear; Loose connector; Moisture/corrosion; Harness vibration fault
Diagnostic checks
Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Check transmission fluid level/condition using correct procedure; Scan TCM data and inspect connector/wiring; Wiggle-test harness while watching live data; Inspect for water intrusion/corrosion
Repair guidance
Service/repair fluid or wiring issues first, test solenoid/valve body, seek transmission specialist for internal faults; Clean/secure connector and repair damaged harness
Verification after repair
Clear code, road-test through the same drive condition, then rescan