Home >> Lexus >> 2010 >> RX 350 FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission (U660E) (Diagnostic Codes (P0796-U0100) & Circuit Tests) >> Automatic Transaxle System >> DTC U0100: Lost Communication with ECM / PCM "A" (TO 08/2009) >> Typical Malfunction Thresholds