1998-1999 GMC 2500 Pickup PCM Engine Computer 9366810

Get Your Truck Running Right Again!

This is a VIN-programmed Powertrain Control Module (PCM) for 1998-1999 GMC 2500 Pickups and other GM vehicles. It arrives ready to install, solving common issues like stalling, rough shifting, and no-starts. Order today to restore your vehicle’s performance!

$115.00

+11.99 USPS Priority Shipping

Availability: Only 2 left in stock



SKU: 590-06234A-155 Categories: ,
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Is Your 1998-1999 GM Truck Running Rough? The PCM Might Be the Culprit.

If you’re dealing with frustrating issues like a persistent check engine light, poor engine performance, erratic shifting, or even a no-start condition in your GMC 2500 or similar GM truck, the problem may lie with the heart of your vehicle’s electronics: the Powertrain Control Module (PCM). The PCM, often called the engine computer, is the central command unit responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can create a cascade of problems that are often difficult to diagnose.

The Simple, Reliable Solution for Your Truck

Instead of spending a fortune at the dealership or taking a gamble on an unprogrammed module from a junkyard, this is your direct-fit, ready-to-install solution. This is a thoroughly tested, used OEM PCM that we program specifically for your vehicle using your VIN. We flash it with the latest GM-certified software updates, ensuring optimal performance and compatibility. This process eliminates the need for expensive dealer programming, saving you time and money and getting your truck back on the road quickly.

From the Diagnostic Bay

We once had a ’99 Chevy Suburban in the shop that was a real ghost hunter’s special. The owner complained of random stalling at idle and a transmission that would slam into gear intermittently. We checked everything—sensors, wiring harnesses, fuel pressure—and couldn’t find a consistent fault. On a hunch, we monitored the PCM’s data stream and noticed the ignition control signal would momentarily drop out right before a stall. We swapped in a VIN-programmed PCM just like this one, and the problems vanished instantly. Internal circuit board failure in these older modules is common, and it often presents as a set of unrelated, maddening symptoms.

Diagnosing a Failing 1998-1999 GMC 2500 PCM

A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing several of the following symptoms, it’s a strong indicator that your engine computer needs replacement. This module is the correct solution for these common issues.

  • ✔ Persistent Check Engine Light (CEL) that won’t clear, or returns with communication error codes (U-codes).
  • ✔ Engine cranks but refuses to start.
  • ✔ Unexplained drops in fuel efficiency.
  • ✔ Rough or unstable idling.
  • ✔ The automatic transmission shifts harshly, late, or not at all.
  • ✔ Noticeable loss of engine power and poor acceleration.
  • ✔ Intermittent stalling for no apparent reason.

Plug-and-Play Installation Process

We make this repair as straightforward as possible. After you place your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then program this module to match your truck’s exact specifications. When the part arrives, the physical installation is simple:

  1. Disconnect the Battery: Always disconnect the negative battery terminal before working on vehicle electronics.
  2. Locate and Remove the Old PCM: On most 1998-1999 GM trucks, the PCM is located in the engine compartment, typically on the driver’s side fender. Disconnect the wiring harnesses and unbolt the module.
  3. Install the New PCM: Bolt the new module in place and securely reconnect the wiring harnesses.
  4. Reconnect the Battery: Reattach the negative battery terminal.

In some cases, a security relearn procedure or a Crankshaft Variation (CASE) relearn may be required after installation. This can typically be performed with a capable bi-directional scan tool and is a standard procedure for this type of repair.

Frequently Asked Questions

Why do I need to provide my VIN?

Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your truck’s specific engine, transmission, and options. This ensures seamless communication and proper function, just like the original part from the factory.

Is this part difficult to install?

The physical installation is very straightforward and typically takes less than 30 minutes with basic hand tools. It involves disconnecting the battery, unplugging the electrical connectors, and swapping the modules.

Will I need to do anything after installation?

Because the PCM is programmed to your VIN, it is nearly a plug-and-play installation. However, some GM vehicles may require a security relearn or a CASE relearn procedure to sync with the vehicle’s anti-theft and crankshaft position sensor systems. This is a simple procedure for any professional mechanic with a proper scan tool.

What’s the difference between a PCM and an ECM?

The terms are often used interchangeably. ECM (Engine Control Module) typically only controls engine functions. A PCM (Powertrain Control Module) controls both the engine and the transmission. For these GM trucks, PCM is the more accurate term.

How do I know for sure my original PCM is bad?

The best way is through professional diagnosis. However, if you have ruled out other common causes (like sensors, wiring, and fuel delivery) and are experiencing multiple symptoms from the list above, a faulty PCM is the most likely cause.

This is a used part. Is it reliable?

Yes. This is a genuine OEM part sourced from a salvaged vehicle. Each unit is inspected and electronically tested to ensure it is fully functional before being programmed and shipped. It’s a reliable and cost-effective alternative to a new dealer part.

MPN

9366810

Year
Conditions & Options

Programmed to your VIN GM: 09355699

Genuine OEM

Yes

Condition

Refurbished

Model

gmc-2500-pickup

Make

Year

1998

Brand

CHEVROLET TRUCK

Manufacturer Part Number

, , , , , ,

Interchange part number

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