{
“title”: “2004 GMC Envoy XL PCM Engine Computer ECM 89017739“,
“long_description”: “
Is Your 2004 Envoy XL Running Poorly? The PCM Might Be the Problem.
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If you’re experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or a sudden drop in fuel economy in your 2004 GMC Envoy XL, the root cause might be a failing Powertrain Control Module (PCM). As the central computer for your engine, the PCM is responsible for managing everything from fuel mixture and spark timing to transmission shifts and emissions control. When it starts to fail, it can create a cascade of problems that are often difficult to diagnose.
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Don’t let a faulty computer keep your reliable GM truck or SUV off the road. This replacement PCM, part number 89017739, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. We take the guesswork and hassle out of the repair process. Unlike a generic module from a parts store, this unit comes pre-programmed specifically for your vehicle using your VIN. This ensures that all factory settings, security information (anti-theft), and engine parameters are a perfect match, making installation straightforward.
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From the Diagnostic Bay
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We had a 2004 Trailblazer EXT (which uses the same platform as the Envoy XL) come into the shop with a bizarre, intermittent no-start condition. The owner had already replaced the battery, alternator, and starter. It would crank but wouldn’t fire, and there were no consistent trouble codes. After hours of chasing wires, we finally focused on the PCM. We noticed that on hot days, the problem was worse. A quick test with a heat gun on the module confirmed our suspicion: thermal failure inside the PCM. We installed a VIN-programmed replacement, and the truck has been starting reliably ever since. It’s a classic example of how a failing PCM can mimic other component failures, costing you time and money.
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Diagnosing a Faulty 2004 Envoy XL PCM
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A failing 2004 Envoy XL PCM can manifest in numerous ways, often mimicking other sensor or component failures. Before condemning the module, it’s wise to check for solid power and ground connections and ensure related sensors are functioning. However, if you’re experiencing a combination of the following symptoms, the PCM is a very likely culprit.
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Common Symptoms of PCM Failure
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- ✔ Persistent Check Engine Light (CEL) with communication error codes (U-codes) or multiple, unrelated sensor codes.
- ✔ Engine stalling or shutting off randomly while driving.
- ✔ No-start or hard-start condition, where the engine cranks but won’t turn over.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Rough or erratic engine idle.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ Apparent loss of spark or fuel injector pulse.
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The Plug-and-Play Solution
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This isn’t just a part; it’s a complete solution. The biggest hurdle in replacing a modern vehicle’s computer is the programming. We handle that for you. Simply provide your vehicle’s 17-digit VIN during checkout, and our technicians will flash the module with the latest, most up-to-date software directly from GM. This ensures compatibility with your specific engine, transmission, and options package. When you receive the part, it’s ready for a direct installation. In many cases, this eliminates the need for an expensive trip to the dealership for programming.
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Wide Compatibility Across the GM Lineup
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This versatile module, also known by part number 12586243, is not just for the Envoy XL. It is the correct factory component for a wide range of 2004 GM trucks, vans, and performance cars, including:
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- Chevrolet Avalanche 2500, Silverado (1500, 2500, 3500), Suburban 2500, Trailblazer EXT, SSR, Corvette, and Express Vans
- GMC Sierra (1500, 2500, 3500), Yukon XL 2500, Envoy (XL, XUV), and Savana Vans
- Buick Rainier
- Cadillac CTS-V (2004-2005)
- Pontiac GTO
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Please verify the part number and check the fitment list to ensure this is the correct module for your specific vehicle and engine combination.
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Frequently Asked Questions
2004 Envoy XL PCM
n What is a CASE relearn and will I need to perform one?n A CASE (Crankshaft Angle Sensor Error) relearn synchronizes the crankshaft position sensor with the PCM. After installing this new , a CASE relearn is often required to prevent a P1336 trouble code. This procedure can be performed with a capable bi-directional scan tool.n
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“short_description”: “
Restore Your Envoy’s Performance!
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Get your 2004 GMC Envoy XL running smoothly again with this VIN-programmed engine control module (PCM/ECM). It arrives ready to install with the latest GM software updates, eliminating guesswork and costly dealer visits. Order now for a reliable, direct-fit solution!
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“meta_description”: “Experiencing engine problems? Our pre-programmed 2004 Envoy XL PCM (part 89017739) is the perfect fix. VIN-matched for easy installation. Order now!”,
“focus_keyword”: “2004 Envoy XL PCM”,
“image_meta”: {
“alt_text”: “Programmed 2004 GMC Envoy XL PCM Engine Control Module 89017739, front view showing connectors.”,
“image_title”: “2004 GMC Envoy XL PCM ECM 89017739“,
“caption”: “VIN-Programmed Powertrain Control Module (PCM) for 2004 GMC Envoy XL and other compatible GM vehicles.”,
“description”: “Detailed image of the 89017739 PCM, the central computer for the engine management system in a 2004 GMC Envoy XL. This unit controls fuel injection, ignition timing, and emissions.”
}
}