Also, if you have access to a scanner, you can view live data to see if the Engine Computer is commanding the lockup clutch on. If it is not, one section of the brake light switch could be stuck, the computer's coolant temperature sensor could be reading an overheating condition, or there could be some other requirement that hasn't been met.
If the lockup clutch IS being commanded on, the fault code could be the result of no drop in rpm was seen. Most of the time that's a result of wiring and connector problems, but the solenoid could be bad too.
Monday, January 5th, 2015 AT 6:52 PM