U1101 Code: Meaning, Causes, and Symptoms | OBD2 Codes

U1101 – Engine-A/T-ECU Time-out


U1101 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


U1101 Possible Causes


Faulty Engine-A/T-ECU,Engine-A/T-ECU harness is open or shorted,Engine-A/T-ECU circuit poor electrical connection,Faulty combination meter


U1101 Description


The combination meter receives transmission control system-related signal from the engine-A/T-ECU via CAN bus lines. If the display unit can not receive the necessary signals, diagnosis code U1101 will be set.