Is Your 1998-1999 GM Truck Running Rough?
If your GMC Yukon, Chevy Tahoe, Suburban, or pickup is experiencing frustrating issues like stalling, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shift points. When it fails, it can cause a wide range of problems that can leave you stranded. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance and reliability.
From the Diagnostic Bay
I remember a ’99 Suburban that came into the shop with a no-start condition. The owner had already replaced the fuel pump and the crank sensor, but it still wouldn’t fire up. We scanned it and got a ‘no communication with PCM’ code. Before ordering a new computer, we did a simple voltage and ground check at the PCM connectors. We found a corroded ground wire on the back of the cylinder head. After cleaning the connection point, the truck fired right up. Always verify the main power and ground circuits to the PCM before condemning the unit itself—it can save you a lot of time and money.
The Direct-Fit Solution: A Programmed 1998-1999 Yukon PCM
This replacement PCM is the reliable and cost-effective solution to get your truck back in top form. We take the guesswork and hassle out of the repair by pre-programming this module specifically for your vehicle using your VIN. This means it arrives with the latest GM software updates already installed, tailored to your truck’s exact specifications. You avoid expensive dealership programming fees and complex diagnostic tool requirements. This unit is a genuine, used OEM part sourced from a salvaged vehicle, ensuring compatibility and function.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) on your dashboard.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Unexplained drop in fuel economy (MPG).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start or intermittent starting condition.
- ✔ Failed emissions test due to module-related codes.
- ✔ Communication errors with diagnostic scan tools.
This module is a direct replacement for a wide range of GM trucks and vans from 1998 to 1999. It is compatible with multiple service numbers, including 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Please verify that your original module carries one of these numbers to ensure proper fitment.
Frequently Asked Questions
Do I need to have this computer programmed?
No. We handle the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN when you place your order, and we will flash the module with the correct, updated software for your specific truck.
Is this part difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery and swapping the module. However, after installation, you will likely need to perform a security relearn procedure (often called Passlock or VATS relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure can usually be done without special tools and instructions are widely available online.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your truck. It contains specific information about its engine, transmission, and factory options. We use the VIN to load the exact GM-certified software your vehicle needs to run correctly.
Is this a new part?
This is a high-quality, tested, used OEM part that has been carefully removed from a salvaged vehicle. This ensures OEM-level fit and function without the high cost of a new-from-dealer part.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the electronic solenoids in the transmission. If the module is failing, it can cause poor shift quality, delayed engagement, or incorrect gear selection. If your issue is caused by a faulty PCM, this part will resolve it.