ATC Aspirator or In-Car Temp Sensor Failure Trouble Code

NAME OF CODE
In-Car Temperature Sensor Failure

WHEN MONITORED
With ignition on

SET CONDITION
BCM senses an abnormally high or low voltage in the in-car temperature input

THEORY OF OPERATION
The in-car temperature sensor is a thermistor for which the BCM provides a 5V pull-up. Under normal operating conditions (-40 to 85°C) this voltage should be between 0.313V and 4.88V

PROBABLE CAUSES
- Wiring open circuit
- Wiring short to ground
- Wiring short to battery
- Failed sensor
- Failed BCM