Restore Peak Performance to Your GM Truck or SUV
Is your 1998-1999 GMC Yukon, Tahoe, or Suburban running rough, stalling unexpectedly, or showing a persistent check engine light? As a technician with over two decades of experience under the hood of these GMT400 trucks, I’ve seen these symptoms countless times. More often than not, the culprit is a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. This isn’t just a part; it’s the central command for your engine’s performance, fuel economy, and transmission shifting. When it fails, it can cause a cascade of frustrating and hard-to-diagnose problems.
This replacement 1998-1999 Yukon PCM is the definitive solution. We take the guesswork and high dealership costs out of the equation. Before we ship it, we flash the module with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication between all your vehicle’s systems and restores the original factory performance and reliability you depend on.
From the Diagnostic Bay
I remember a ’99 Tahoe that came into my shop on a tow truck. The owner was at his wit’s end. He’d replaced the fuel pump and ignition coil, but the truck would still randomly die at stoplights and refuse to restart for 20 minutes. No consistent codes, just pure frustration. After confirming power and ground at the PCM connector, we knew where to look. The original PCM was failing internally when it got hot. We installed a VIN-programmed module just like this one, and the truck fired up instantly and ran perfectly. It’s a classic failure on these models, and this is the reliable fix.
Is Your GM Truck or SUV Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement:
- ✔ Sudden stalling or engine cutting out
- ✔ No-start condition, even with a good battery and starter
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error), P0605 (Internal Control Module Read Only Memory (ROM) Error), or U-codes indicating loss of communication
- ✔ Poor fuel economy and noticeable loss of power
- ✔ Failure to pass an emissions inspection
A Straightforward Guide to Installation
One of the biggest benefits of this module is its simple, plug-and-play installation. No dealership visit is required. Here are the basic steps for the DIYer or professional mechanic:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine compartment on the driver’s side, near the fender or firewall. It’s a metal box with several large multi-pin connectors.
- Disconnect and Remove: Carefully unclip and remove the electrical connectors. Note their colors or positions. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the electrical connectors, ensuring they click securely into position.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Final Check: Turn the key to the ‘On’ position (without starting) for 10 seconds, then turn it off. Repeat this 2-3 times. Then, start the engine. The vehicle is now ready to drive.
Verified Vehicle Compatibility
We guarantee this module is a direct-fit replacement for the original part. Please verify your part number (16250279, 09366810, or 09355699) matches. This module is compatible with the following vehicles:
• 1999 Escalade
Chevrolet Trucks & Vans:
• 1998-1999 C/K 1500, 2500, 3500 Pickup (Gasoline)
• 1998-1999 Suburban 1500, 2500 (Gasoline)
• 1998-1999 Tahoe (Gasoline)
• 1998-1999 Astro Van
• 1998 Express 1500, 2500, 3500 Van (Gasoline)
• 1998 S10 / Blazer
GMC Trucks & Vans:
• 1998-1999 C/K 1500, 2500, 3500 Pickup (Gasoline)
• 1998-1999 Yukon (Gasoline)
• 1998-1999 Safari Van
• 1998 Savana 1500, 2500, 3500 Van (Gasoline)
• 1998 S15 Sonoma / Jimmy
• 1998 Envoy
Oldsmobile / Isuzu:
• 1998 Bravada
• 1998 Isuzu Hombre (4.3L V6)
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to program the module with the exact software and calibrations your specific vehicle requires. This ensures perfect compatibility with your engine, transmission, and options, making the installation truly plug-and-play.
Is any additional programming needed after installation?
No. This module arrives 100% ready to install. Since it is programmed to your VIN, you do not need to take it to a dealer or mechanic for further flashing or setup. In rare cases, a simple security relearn procedure may be needed, which can be done without any special tools.
Where is the PCM located on my 1999 Yukon?
On the 1998-1999 GMC Yukon and similar GM trucks, the PCM is typically found in the engine bay, mounted to the inner fender on the driver’s side.
Will this fix my check engine light for code P0601?
Yes. DTC P0601 (Internal Control Module Memory Check Sum Error) is a direct indication of an internal failure within the PCM itself. Replacing the faulty module with this correctly programmed unit is the proper and definitive fix for this code.
Does this module come with the latest software?
Absolutely. We flash every module with the most current GM-released software available for your VIN. This can often resolve drivability issues that were present even when the truck was newer, providing improved performance and reliability.