Conditions for Setting the DTC
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
P0535
The rate of change of the evaporator air temperature signal voltage has exceeded a calibrated value
P0537
The evaporator air temperature signal voltage is too low out of the expected range.
P0538
The evaporator air temperature signal voltage is too high out of the expected range.
P153B
The absolute difference between the value of the Evaporator Air Temperature and Outside Air Temperature sensors exceeds the calibrated value.
or
The absolute difference between the value of the Evaporator Air Temperature and Inlet Air Temperature sensors exceeds the calibrated value.