DTC P1598: A/C Pressure Sensor Volts Too High: Description

A/C pressure sensor signal voltage is monitored with engine running and A/C relay energized. DTC will set in Powertrain Control Module (PCM) memory when PCM senses A/C pressure sensor voltage is more than 4.92 volts. Possible causes are: signal circuit open or shorted to voltage, defective A/C pressure sensor, sensor ground circuit open or defective PCM.