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Chevy Trailblazer 2006 6-Cylinder P0601 Code: Idle Stalling and Diagnosis Guide

Model: Chevy Fault Code: P0601 Posted: 2021-05-09 07:50

My 2006 Chevrolet Trailblazer 6-cylinder truck is stalling when idling after about 10 to 60 minutes of operation. The engine consistently stalls, and I'm currently receiving a P0601 diagnostic trouble code (DTC). This error indicates an issue with the engine control module's (ECM) internal reference voltage or power supply. I've cleared the code multiple times, but it returns every time during idle testing. I'm unsure what to check next—whether it's related to wiring, ground connections, or a faulty PCM. The truck has not had any major repairs or component replacements prior to this issue occurring. I'm looking for clear guidance on how to diagnose and resolve the P0601 code in this specific model.

Related fault codes
P0601
Comments (9)
Anonymous 2021-05-10 07:23

Please provide your vehicle's full details: year, make, model, engine size. This is essential for accurate troubleshooting of the P0601 code on a Chevrolet Trailblazer.

Anonymous 2021-05-10 07:30

Have you performed any work on the truck or replaced components before this issue appeared? If so, ensure the Powertrain Control Module (PCM) was properly programmed after replacement. Before replacing the PCM, verify all power and ground connections to the ECM are intact and functioning correctly. When clearing the P0601 code, it should set immediately during key-on engine-off (KOEO) or key-on engine-running (KOER) tests.

Anonymous 2021-05-10 10:31

I've been experiencing this exact idle stalling issue before any repairs were done. The truck would stall under similar conditions, and now I'm consistently getting the P0601 code. After clearing the code multiple times, the problem persists—every time I attempt to run the engine at idle, it stalls and the same error returns. This is on a 2006 Chevrolet Trailblazer with a 6-cylinder engine.

Anonymous 2021-05-10 20:20

Have you replaced the PCM? If yes, was it properly programmed after installation? Always verify power and ground connections to the PCM before assuming failure. A faulty connection can mimic PCM issues.

Anonymous 2021-05-11 07:32

If power and ground circuits are confirmed as healthy, a PCM replacement may be necessary. Many online services offer reprogrammed PCM units—just provide your VIN and they’ll send you one with the latest software updates. Checking the 5V reference circuit is critical; corrosion or poor wiring can cause P0601. I can share a detailed PCM pinout diagram if needed.

Anonymous 2021-05-11 10:16

I have not replaced the PCM yet. I'm trying to determine whether that's necessary. Any guidance on how to test the PCM would be very helpful. I’ve taken a picture of my readings and am checking the black wire at the PCM connector as per online instructions. The reading is over 0.3V—does this indicate a bad PCM? According to one source, when using a digital voltmeter set to 1V DC: connect the negative lead to the battery negative terminal, with the key on and engine off, probe each ground circuit at the ECM harness. A voltage drop greater than 0.3V indicates corrosion or faulty wiring—clean or replace the circuit and retest.

Anonymous 2021-05-11 14:34

Which wire are you testing? Specifically, which black wire on the PCM connector (e.g., pin number)? I can provide a detailed PCM pinout diagram for your 2006 Trailblazer 6-cylinder model.

Anonymous 2021-05-11 16:14

There are two adjacent black wires near each other at that location. I’ve tried to locate the wiring diagram for this 2006 Chevrolet Trailblazer 6-cylinder, but couldn’t find which wire corresponds to the reference ground or power circuit. I selected one of the black wires—both appear similar in color and are close together. I’m not sure which pin number they represent, but I believe it’s one of those two. Can you confirm which one is correct for testing?

Anonymous 2021-05-12 10:56

I’ve sent the PCM pinout diagrams for your 2006 Chevrolet Trailblazer 6-cylinder model. Please let me know if you need any additional information or further clarification on how to perform the tests.