P1639 SATURN - PCM 5 Volt Reference Voltage Circuit Condition
- Sensor using 5 volt reference line shorted to ground
- Circuit short to ground
When is the code detected?If the voltage is out of tolerance, the Powertrain Control Module (PCM) will set DTC P1639.
- Engine Light ON (or Service Engine Soon Warning Light)
P1639 Saturn DescriptionThe Powertrain Control Module (PCM) uses the 5-volt reference 2 circuit as a sensor feed for the A/C refrigerant pressure sensor. The PCM monitors the voltage on the 5-volt reference 2 circuit.
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