We're still looking for the perfect video. Got any ideas? Share them with us! Login
Volvo engine code DTC U0155
Ambient Air Temperature Sensor (AAT): Rationality Monitor The rationality monitor for the ambient air temperature sensor monitors for missing signal from the sensor. If the sensor signal is missing for a specified time the rationality DTC is set. U0155 Ambient Air Temperature Sensor (AAT): Missing Signal DTC U0155 Component / System AAT - Missing Monitor Strategy Description Missing Signal From Sensor Fault Limit Time Out > 9 seconds Enable Conditions • Key On Active • Battery Voltage > 8 V Disable Conditions No Active DTC's: • N/A Time Required For DTC To Be Set Continuous MIL Illumination 2 Drive Cycles