Uploaded July 2026 | Updated September 2026, 3 weeks ago

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My 2009 Silverado has an intermittent A/C problem: the A/C light blinks, the compressor clutch will not engage, and the scan tool shows a P0532 A/C pressure sensor circuit low-voltage code.

A pressure sensor code does not automatically mean the sensor is bad. In this video, I use scan data, voltage measurements, a wiggle test, and a circuit integrity test to determine whether the fault is inside the sensor or somewhere in the wiring.

I also demonstrate how to use a test light as a buffer when jumping a 5-volt reference circuit, protecting the circuit if you accidentally connect to ground.

This is a practical review of 5-volt reference, signal, and low-reference circuit testing—and another example of why you should never replace a part based only on a trouble code.

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⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk.

0:00 Blinking A/C Light and P0532
0:40 Scan Data and Locating the Pressure Sensor
1:34 Wiggle Test and Initial Circuit Checks
3:08 No 5-Volt Reference at the Sensor
4:19 Inspecting the Harness
5:22 Test Light Circuit Integrity Test
7:53 Verifying the Repair
9:34 Final Diagnostic Review
11:16 Power Wagon Bonus Footage