Is Your 1998-1999 GMC Yukon Running Rough?
If your trusty GMC Yukon, or another compatible GM truck or van from that era, is suddenly experiencing baffling issues like stalling, poor fuel economy, a persistent check engine light, or a no-start condition, the problem might be its electronic brain: the Powertrain Control Module (PCM). The PCM is the central command center for your engine and transmission, and when it fails, it can cause a wide range of frustrating and difficult-to-diagnose symptoms. Don’t let a faulty computer keep your vehicle off the road. This is your direct-fit, reliable solution.
From the Diagnostic Bay
I remember a 1999 Chevy Suburban that came in on a tow truck. The owner had spent a fortune replacing the fuel pump, spark plugs, and multiple sensors trying to solve an intermittent stalling and hard-starting issue. The codes were all over the place. After checking all the basics, we hooked up our scope to the injector and ignition coil drivers. The signals were erratic, dropping out randomly. This pointed directly to the PCM. We installed a VIN-programmed unit just like this one, performed the security relearn, and the truck fired up instantly and ran like new. The owner was relieved to finally have a real solution instead of just throwing parts at the problem.
Symptoms of a Failing 1998-1999 Yukon PCM
A failing PCM can manifest in many ways. If you’re noticing any of the following, it’s a strong indicator that your engine computer needs replacement:
- ✔ Persistent Check Engine Light (CEL) with various or no specific codes.
- ✔ Engine stalling or cutting out unexpectedly while driving.
- ✔ No-start or hard-start conditions, especially when the engine is warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic idling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Misfire codes that don’t resolve after replacing plugs, wires, or coils.
The Right Solution: VIN-Programmed and Ready to Install
Simply swapping a used computer from another vehicle won’t work. Each PCM is programmed with a specific Vehicle Identification Number (VIN) and contains software tailored to that vehicle’s engine, transmission, and options. Our process eliminates the guesswork and the need for an expensive trip to the dealership. When you order, you provide us with your vehicle’s VIN. We then flash this module with the latest, most stable software updates directly from GM for your exact vehicle. This ensures optimal performance, fuel economy, and emissions compliance.
This is a genuine, used OEM part sourced from a salvaged vehicle and has been thoroughly inspected. It is programmed to be a direct replacement for part numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Once you receive the part, installation is straightforward. In most cases, you will need to perform a simple security relearn procedure (often called a CASE relearn) which can be done without special tools. This syncs the new computer with your vehicle’s anti-theft system.
Extensive Vehicle Compatibility
This Electronic Control Module is a direct fit for a wide range of GM trucks, SUVs, and vans. Please verify your part number (ID 9355699) matches. This part fits:
- 1999 Chevrolet & GMC 1500 Pickup (5.0L, 5.7L)
- 1998-1999 Chevrolet & GMC 2500/3500 Pickup (Gasoline)
- 1998-1999 Chevrolet Express & GMC Savana 1500/2500/3500 Van (Gasoline)
- 1998-1999 Chevrolet Suburban 1500/2500 (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- 1999 Cadillac Escalade
- 1998 Chevrolet Astro & GMC Safari
- 1998 Oldsmobile Bravada, GMC Envoy, Chevrolet S10 Blazer, GMC S15 Jimmy
- 1998 Chevrolet S10, GMC Sonoma, Isuzu Hombre (4.3L V6)
Frequently Asked Questions
Do I need to have this computer programmed?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your specific vehicle.
Is this a plug-and-play installation?
It is a direct physical fit. After installation, you will likely need to perform a security relearn procedure to sync the computer with your vehicle’s anti-theft system. This procedure can typically be done without any special tools and instructions are widely available online.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
Is this a new part?
This is a high-quality, tested, used OEM part that has been sourced from a salvaged vehicle. It has been inspected and is ready for programming and installation in your vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both the engine and the transmission. If the module is failing, it can send incorrect signals to the transmission, causing harsh or erratic shifting. Replacing a faulty PCM often resolves these types of electronic transmission issues.