Engine-Codes - Chevrolet - P1639 Chevrolet

P1639 Chevrolet Code - PCM 5 Volt Reference Voltage Circuit Condition

- Code Popularity: 43,982 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC P1639 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Sensor using 5 volt reference line shorted to ground
  • Circuit short to ground
⚠ Does your Chevrolet have Safety Recalls? → Check here

How to Fix the DTC P1639 Chevrolet?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for P1639 Chevrolet Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1639 Chevrolet code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

If the voltage is out of tolerance, the Powertrain Control Module (PCM) will set DTC P1639.

What are Code Possible Symptoms?

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

What Does the P1639 Chevrolet Code Mean?

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.

P1639 Chevrolet Code - PCM 5 Volt Reference Voltage Circuit Condition

Need more Information on the Code?

Need more information on how to fix the P1639 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1639 Chevrolet code diagnosed by a professional: Find a repair shop in your area