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Engine-Codes.com | All About OBDII Engine Codes

P1639 Chevrolet

P1639 Chevrolet - PCM 5 Volt Reference Voltage Circuit Condition

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P1639 Chevrolet Comments |  Add Comment
Possible causes
- Sensor using 5 volt reference line shorted to ground
- Circuit short to ground
Help with Possible causes What does this mean?
When is the code detected?
If the voltage is out of tolerance, the PCM will set DTC P1639.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1639 Chevrolet 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.

CHEVROLET Technical Service Bulletins for P1639 code
2002 CHEVROLET TRAILBLAZER Electrical System Details
2003 CHEVROLET TRAILBLAZER Electrical System Details
2004 CHEVROLET TRAILBLAZER Electrical System Details
2002 CHEVROLET TRAILBLAZER 110000 Electrical System Details
2003 CHEVROLET TRAILBLAZER 110000 Electrical System Details
2004 CHEVROLET TRAILBLAZER 110000 Electrical System Details
Help with Technical Service Bulletins What does this mean?
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