2002 GMC Envoy PCM Powertrain Control Module 12571178

Get Your Envoy Running Right Again!

This Powertrain Control Module (PCM) comes fully programmed to your vehicle’s VIN. It’s the simple, direct-fit solution for stalling, rough running, and no-start issues. No dealership visit required. Provide your VIN at checkout and get back on the road fast!

$89.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06336-5 Categories: ,
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Is Your 2002 GMC Envoy Running Rough? The PCM Might Be the Culprit.

If you’re experiencing baffling issues with your 2002 GMC Envoy, Chevrolet Trailblazer, or Oldsmobile Bravada, you’re not alone. These dependable SUVs can develop frustrating problems like stalling, erratic shifting, no-start conditions, or a dashboard lit up with warning lights. Often, the root cause isn’t a dozen different failing sensors, but one single component: the Powertrain Control Module (PCM), the central computer that manages everything from fuel injection to transmission shifting.

A failing PCM can mimic a wide range of mechanical failures, leading to costly and incorrect repairs. Instead of chasing ghosts in the machine, address the source of the problem with a reliable, correctly programmed replacement PCM. This unit is the direct-fit solution for your vehicle, designed to restore factory performance and communication between all essential vehicle systems.

From the Diagnostic Bay

A customer brought in their ’02 Trailblazer with a complaint that stumped two other shops. It would randomly stall at stoplights, but only when the A/C was on and the outside temperature was above 80 degrees. There were no consistent trouble codes, just a generic communication error that would pop up occasionally. We checked fuel pressure, the alternator, and the battery—all were fine. After hours of diagnostics, we hooked up a scope to the PCM’s main power and ground circuits. We noticed a tiny, intermittent voltage drop inside the module itself right before a stall. We swapped in a known-good, programmed PCM, and the problem vanished instantly. The original module had an internal fault that only showed up under specific thermal and electrical loads. It’s a classic example of how a failing PCM can create symptoms that seem to have no logical cause.

Symptoms of a Failing 2002 Envoy PCM

  • ✔ Check Engine Light: The check engine light is on, and you may have codes related to communication errors (U-codes), sensor circuits, or processor faults.
  • ✔ No-Start or Hard Starting: The engine cranks but refuses to start, or takes an unusually long time to fire up, either hot or cold.
  • ✔ Poor Engine Performance: You may notice a significant loss of power, hesitation during acceleration, rough idling, or a sudden decrease in fuel economy.
  • ✔ Erratic Transmission Shifting: The transmission may shift harshly, get stuck in one gear (limp mode), or shift at the wrong times because the PCM is not sending the correct signals.
  • ✔ Intermittent Stalling: The vehicle may stall for no apparent reason while driving or when coming to a stop.
  • ✔ Communication Issues: Your mechanic’s scan tool may be unable to communicate with the PCM, making diagnosis impossible.

The Critical Importance of VIN Programming

You can’t simply install a used PCM from another vehicle and expect it to work. On these GM platforms, the PCM is tied directly to your vehicle’s unique Vehicle Identification Number (VIN). The VIN contains specific information about your truck’s engine, transmission, emissions equipment, and other factory options. Our service eliminates the guesswork and the need for expensive dealership tools. We flash this module with the latest GM-certified software updates using your specific VIN. This ensures that the computer is a perfect match for your vehicle’s configuration, providing seamless integration and optimal performance right out of the box.

This process ensures all components operate as the manufacturer intended, restoring fuel efficiency, emissions compliance, and drivability. After installation, a simple security relearn procedure may be required, which can typically be done in your driveway without any special tools.

This Module is a Direct Fit For:

  • 2002 Oldsmobile Bravada (LH Engine)
  • 2002 Chevrolet Trailblazer (LH Engine)
  • 2002 Chevrolet Trailblazer EXT (LH Engine)
  • 2002 GMC Envoy (LH Engine)
  • 2002 GMC Envoy XL (LH Engine)

This part replaces the following part numbers: 19210066, 12571178, 12576463, 16255240, DLDA, YBLR, YBRY, YBZP.

Frequently Asked Questions

Do I need to send you my old PCM?

No, there is no core charge or need to send us your original part. This is a direct purchase, allowing you to get your vehicle repaired faster.

What information do you need from me?

After you place your order, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship the module without it. The VIN is typically found on your driver’s side dashboard (viewable through the windshield) or on the driver’s side door jamb sticker.

Is this part difficult to install?

Physically, the PCM is straightforward to replace. It’s located in the engine bay and is typically held in place by a few bolts and has several electrical connectors. The most important step after installation is performing the security relearn procedure, which pairs the new PCM to your vehicle’s anti-theft system. Instructions for this procedure are widely available online and usually take about 30 minutes to complete.

Will this fix my vehicle’s problem for sure?

While this 2002 Envoy PCM is a common solution for the symptoms listed, proper vehicle diagnosis is always recommended. This part will solve issues directly caused by a faulty PCM. It will not solve problems related to other bad sensors, wiring harnesses, or mechanical failures.

What does “flashed with the newest updates” mean?

Vehicle manufacturers like GM often release software updates for their modules to improve performance, fix bugs, or enhance drivability long after the vehicle has been sold. We ensure your replacement PCM is programmed not just with your VIN’s data, but also with the latest stable software version available from GM for a superior-to-factory operational state.

MPN

12571178

Year

Conditions & Options

Programmed to your VIN GM: 12571178

Genuine OEM

Yes

Condition

Refurbished

PartNumber

590

Model

ENVOY

Year

2002

Brand

GM

Manufacturer Part Number

, , , , , , ,

Interchange part number

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