Supersedes Technical Service Bulletin Group 37 number 13-85 dated
February 4, 2013. Customer may report transmission warning lamp illuminated in instrument cluster. After ignition cycle, the warning message is no longer present. DTC P074100 "Torque Converter Clutch Circuit Performance" or "Stuck Off" is stored in TCM. The fault occurs with ATF temperature below 60o C. Check for this temp range in the extended environmental conditions of the diagnosis protocol. This TSB only applies if the ATF level is correct and there are no leaks.
