Drive with caution — fix soon.
This code means the torque converter clutch is staying engaged (locked) when the computer expects it to release, often because of a stuck solenoid or hydraulic problem in the valve body. The classic symptom is the engine stalling or shuddering as you slow to a stop because the transmission stays mechanically coupled to the engine. Repairs usually involve replacing the TCC solenoid or servicing the valve body, sometimes along with a fluid change.
$150 – $1200
Varies by vehicle and root cause.
You can sometimes manage short trips, but it's risky because the engine may stall when you stop. If it stalls repeatedly, have it towed to avoid being stranded in traffic and get it fixed promptly.
A TCC solenoid or fluid service typically costs $150 to $600. If the valve body or torque converter needs attention, the repair can climb to $600 to $1,200 or more.
It's moderately serious mainly because of the stalling risk. The car may shut off at stops, which is unsafe in traffic, so it should be addressed quickly even though it rarely causes sudden internal damage.
The torque converter clutch is stuck locked, so the engine stays mechanically tied to the wheels as you stop, much like leaving a manual car in gear without pressing the clutch, which makes it stall.