Programmed 1998 Envoy PCM 9366810 | Engine Control Module

Restore Your Truck’s Brainpower

End frustrating no-starts and poor performance with this fully programmed Powertrain Control Module. We flash it to your vehicle’s VIN with the latest GM software, making installation simple and saving you a trip to the dealer. This reliable, tested unit is the perfect fix for a wide range of 1998-1999 GM trucks and vans. Get your vehicle back to peak performance and reliability. Order today to get back on the road fast!

$115.00

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06234A-163 Categories: ,
Guaranteed Safe Checkout

Get Your GM Truck Running Right Again

If you’re dealing with frustrating, hard-to-diagnose issues on your 1998 GMC Envoy or another compatible GM truck or van, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle’s engine and transmission, even a small internal fault can cause major problems, from a simple check engine light to a no-start condition that leaves you stranded. I’ve seen it hundreds of times in my shop: owners chase down sensor after sensor, only to find the root cause was the main computer all along. This reliable, used PCM is the straightforward, cost-effective solution you’ve been looking for.

This isn’t just a used part pulled from a shelf. Each module is meticulously programmed with the latest GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) after your purchase. This critical step ensures that when you receive the part, it communicates perfectly with your vehicle’s systems, restoring original performance, shift patterns, and fuel efficiency. You get a direct-fit replacement without the exorbitant cost and programming fees of a dealership visit. This is the ideal fix for both seasoned mechanics and DIY enthusiasts looking to perform a professional-level repair at home.

A Technician’s Notebook: The Ghost in the Machine

I once had a 1999 Chevy Suburban in the bay with an intermittent no-start that was driving the owner crazy. It would be fine for weeks, then suddenly refuse to fire up. There were no consistent trouble codes, and the fuel pressure and spark were present during testing. After checking grounds and wiring harnesses, we swapped in a known-good test PCM. The problem vanished instantly. The original module had an internal hairline fracture on the circuit board that would separate when the temperature changed, cutting off communication. This programmed 1998 Envoy PCM is the exact type of reliable fix that solves those ghostly electronic issues for good.

Is Your GM Truck Showing These Signs?

A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution.

  • ✔ Check Engine Light is illuminated with internal processor codes (like P0601, P0602, or P0606).
  • ✔ The engine cranks but will not start.
  • ✔ Noticeable decrease in fuel economy.
  • ✔ The transmission shifts harshly, late, or not at all.
  • ✔ Stalling, stumbling, or hesitation during acceleration.
  • ✔ Failure to pass an emissions inspection.
  • ✔ Communication errors with scan tools.

A Straightforward Guide to Installation

Installing your pre-programmed 1998 Envoy PCM is a manageable job for a DIYer with basic tools. While specific locations vary slightly by model (e.g., engine compartment vs. by the battery), the general process is consistent.

  1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for capacitors to discharge.
  2. Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s or passenger’s side fender well.
  3. Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses from the old module. These connectors have locking tabs that need to be released before pulling. Do not force them.
  4. Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new unit.
  5. Install the New PCM: Mount your new, programmed PCM onto the bracket and secure it with the original hardware.
  6. Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
  7. Perform Security Relearn (If Necessary): In some cases, a simple security relearn procedure is required. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service information for specific steps.

Verified Compatibility for Your GM Vehicle

This module is a direct replacement for service numbers 09355699, 16266645, 16250279, 16258815, and 9366810. It is guaranteed to fit the following vehicles with matching options. Please verify your original part number or consult the list below.

Fitment Details (Service ID 9355699):

  • ASTRO 98: (LH front by battery)
  • BLAZER S10/JIMMY S15 98: (RH front engine compartment), w/o build date opt ZN4
  • BRAVADA 98: (6-262, 4.3L), w/o build date opt ZN4
  • CHEVROLET/GMC 1500/2500/3500 PICKUP 98-99: gasoline (LH engine compartment)
  • ENVOY 98: (RH front engine compartment), w/o build date opt ZN4
  • ESCALADE 99: (LH front engine compartment)
  • EXPRESS/SAVANA 1500/2500/3500 VAN 98-99: gasoline
  • ISUZU HOMBRE 98: 4.3L, w/o extended build date opt ZN4
  • S10/S15/SONOMA 98: 6-262 (4.3L), w/o build date opt ZN4
  • SAFARI (GMC) 98: (LH front by battery)
  • SUBURBAN 1500/2500 98-99: gasoline (LH front engine compartment)
  • TAHOE/YUKON 98-99: gasoline (LH engine compartment)

Frequently Asked Questions

Frequently Asked Questions

Do I need to do anything after I install it?

Because we program the module to your VIN before shipping, it is a direct installation. Some vehicles may require a simple security relearn procedure, which does not require special tools. We recommend checking your vehicle’s specific procedure.

Why do you need my VIN?

Your Vehicle Identification Number (VIN) allows us to flash the PCM with the exact software and calibrations your specific vehicle requires. This ensures proper engine, transmission, and emissions system operation.

Is this a new part?

No, this is a high-quality, tested, and guaranteed used part sourced from a salvaged vehicle. This allows us to provide a reliable, cost-effective solution.

Will this fix my check engine light?

If the check engine light is caused by an internal PCM failure (such as code P0601), this part will resolve the issue. It’s crucial to ensure your vehicle’s issues have been properly diagnosed before ordering.

How do I find my original part number?

The part number is printed on a sticker on the PCM itself. You may need to unbolt it from its bracket to see the label clearly.

What if I order the wrong part?

We strongly encourage you to verify fitment using the list provided and your VIN. Please contact us before ordering if you are unsure, and we can help confirm compatibility to avoid any issues.

MPN

9366810

Conditions & Options

Programmed to your VIN GM: 09355699

Genuine OEM

Yes

Condition

Refurbished

Model

ENVOY

Make

Year

1998

Brand

CHEVROLET TRUCK

Manufacturer Part Number

, , , , , ,

Interchange part number

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