OBDII Code List

P1639 SATURN - PCM 5 Volt Reference Voltage Circuit Condition

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • 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.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1639 Saturn Description

The 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.
OBDII Code P1639 Saturn - PCM 5 Volt Reference Voltage Circuit Condition -

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P1639 SATURN Comments

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