Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, poor fuel economy, or even a no-start condition in your late 90s or early 2000s GM vehicle, a failing Powertrain Control Module (PCM) is a very common culprit. The PCM is the brain of your vehicle’s engine and transmission, controlling everything from fuel injection and spark timing to transmission shift points. When it starts to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. Don’t let a faulty computer keep your reliable truck or van off the road. This direct-fit replacement PCM is the solution you need to restore performance and reliability.
From the Diagnostic Bay
I remember a 1999 Chevy K2500 that came in with the most bizarre issue. The owner said it would randomly stall at stoplights, but only after it was fully warmed up. There were no consistent trouble codes, just a generic P0300 random misfire that would pop up occasionally. We checked fuel pressure, spark, and vacuum lines—everything seemed perfect. After hours of chasing our tails, we hooked up a high-end scanner and monitored the PCM data stream. We noticed that the injector pulse width would suddenly drop to almost zero right before the stall. It was a classic case of an internal PCM fault caused by heat soak. We installed a VIN-programmed module just like this one, performed the CASE relearn, and the truck ran perfectly. It’s a reminder that sometimes the ghost in the machine is the machine itself.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light (CEL) is on with various trouble codes.
- ✔ Engine stalls, stumbles, or misfires intermittently.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle fails to start even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
Your Direct-Fit 1999 Suburban 2500 PCM Solution
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and hassle out of the repair process. When you order, you provide us with your vehicle’s unique 17-digit Vehicle Identification Number (VIN). Our technicians then flash the module with the latest, most up-to-date GM factory software specific to your exact vehicle configuration. This ensures that all engine, transmission, and emissions parameters are set correctly for optimal performance and longevity. This process eliminates the need for an expensive trip to the dealership for programming.
This module is a direct replacement for part number 16265035 and is also compatible with part numbers 16263494 and 8162634940. It fits a wide array of popular GM trucks and vans from the era, including the Chevrolet Silverado, Suburban, Tahoe, Express, S10, and Blazer, as well as the GMC Sierra, Yukon, Savana, and Jimmy. Please verify the extensive fitment list to confirm compatibility with your specific model and options.
Frequently Asked Questions
Do I need to program this module?
No. This module comes fully programmed to your vehicle’s VIN. Simply provide your VIN to us after purchase, and we handle all the programming before shipping the part to you.
Where is the PCM located on my 1999 Suburban 2500?
On most GMT400 platform trucks and SUVs like the 1999 Suburban 2500, the PCM is located in the engine compartment on the driver’s side, typically near the firewall or inner fender.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific vehicle. It contains information about the make, model, year, engine, transmission, and other factory-installed options. We use the VIN to load the exact correct software for your vehicle, ensuring perfect compatibility and performance.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, the light can be triggered by many other failing components. It is always best to have the vehicle properly diagnosed to confirm the PCM is the root cause of the problem.
Is any other procedure needed after installation?
In many cases, after installing the new PCM, you may need to perform a Crankshaft Position System Variation Learning Procedure, also known as a CASE relearn. This procedure requires a compatible professional scan tool and allows the new PCM to learn the specific characteristics of your engine’s crankshaft position sensor for accurate misfire detection. Some vehicles may also require a security relearn procedure, which can often be done without special tools.