Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet 3500, Express Van, or another GM vehicle from the late 90s and early 2000s suffering from baffling electrical or performance issues? Problems like erratic shifting, a persistent check engine light, stalling, or a complete no-start condition often point to a failing Powertrain Control Module (PCM). This module, part number 16265035, is the central computer for your engine and transmission. When it malfunctions, it can disrupt nearly every aspect of your vehicle’s operation. This isn’t just a replacement part; it’s a fully programmed, plug-and-play solution to get your reliable workhorse back on the road.
The Direct Solution for a Failing 1999-2000 Chevy 3500 PCM
The PCM is responsible for managing critical functions like fuel delivery, spark timing, transmission shift points, and emissions controls. Over time, heat, vibration, and age can cause internal components to fail, leading to a host of frustrating symptoms. Instead of spending hundreds or even thousands at a dealership for a new module and programming, our service provides a cost-effective and reliable alternative. We take your vehicle’s unique Vehicle Identification Number (VIN) and flash this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance, tailored specifically to your vehicle’s factory specifications.
From the Diagnostic Bay
We once had a 2000 Chevy Express 2500 van come into the shop with a severe transmission issue: it was slamming into gear and wouldn’t shift past 2nd. The owner had already replaced the transmission and multiple shift solenoids with no success. After hooking up our scan tool, we noticed the PCM was intermittently losing communication. We checked the powers and grounds to the module, which were solid. The diagnosis? A failing driver circuit inside the original PCM was sending faulty signals to the transmission. We installed one of our pre-programmed modules, performed a quick security relearn, and the van shifted perfectly. It’s a classic case where the root problem was electronic, not mechanical, saving the customer from further unnecessary repairs.
Common Symptoms of a Faulty PCM
- ✔ Persistent Check Engine Light (CEL) with communication error codes (U-codes).
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start.
- ✔ A noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Multiple unrelated sensor codes appearing simultaneously.
Replacing your failing module with this pre-programmed unit is the most effective way to resolve these issues. We handle the complex programming so you can focus on the straightforward installation. Simply provide your VIN upon purchase, and we’ll ship a module that is ready to be installed right out of the box. In many cases, a simple security relearn procedure (which you can do yourself) is all that’s needed to get your vehicle running smoothly again.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module comes fully programmed to your vehicle’s specific VIN with the latest GM software updates before it is shipped. It is designed to be a plug-and-play solution.
What is a VIN and why do you need it?
The VIN is your 17-digit Vehicle Identification Number. It contains specific information about your vehicle’s engine, transmission, and factory options. We use it to load the exact correct software file for your vehicle, ensuring perfect compatibility.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this replacement module will resolve the issue. It’s crucial to properly diagnose the problem before ordering, as the light can be triggered by many other components.
Is any additional setup required after installation?
In many cases, you may need to perform a security relearn procedure, also known as a Passlock or VATS relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and can typically be done without any special tools by following a simple key-on/key-off sequence. Instructions are readily available online for your specific model.
Where is the PCM located on my vehicle?
On most GM trucks and vans of this era, the PCM is located in the engine compartment. Common locations include the driver’s side (LH) inner fender, under the battery tray, or on the passenger side (RH) firewall.