A P0744 code in your 2021 Honda Pilot indicates an intermittent problem in the torque converter clutch circuit. The TCC system works sometimes but fails or behaves erratically at other times. This inconsistency makes diagnosis challenging but points to connection or component issues that aren't complete failures.
Intermittent TCC Behavior
An intermittent TCC circuit might work fine for miles then suddenly fail. The TCC may engage and disengage erratically. Performance may change with temperature, vibration, or other conditions. The TCM recognizes this pattern of on-again, off-again operation as intermittent.
Common Causes
Loose connections at the transmission connector work sometimes but not always. Wiring with damaged insulation may short or open depending on position. A solenoid that's failing may work when cold but fail when hot (or vice versa). Corroded terminals may make contact inconsistently. Vibration can cause marginal connections to fail intermittently.
Symptoms in Your Pilot
TCC operation seems inconsistent—sometimes locks up properly, other times doesn't. Fuel economy may vary from trip to trip. Occasional shudder when TCC transitions. The check engine light may illuminate and then go off. Symptoms may correlate with specific conditions like heat, cold, or rough roads.
Diagnostic Approach
Using Honda HDS, monitor TCC status over an extended drive. Note when failures occur and what conditions exist. Wiggle test connectors while monitoring circuit response. Check for heat-related issues by monitoring when cold and hot. Inspect all connections for proper terminal tension and cleanliness.