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 a no-start condition in your Chevrolet or GMC vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its proper function is critical. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This replacement Powertrain Control Module is the definitive solution to restore your vehicle’s performance, reliability, and drivability.
What is a Powertrain Control Module?
The PCM, sometimes called the Engine Control Module (ECM), is the electronic brain of your vehicle. It constantly analyzes data from sensors throughout the engine and transmission to make millions of calculations per second. It controls vital systems like fuel injection timing, spark advance, transmission shift points, and emissions equipment. A healthy PCM ensures your engine runs efficiently, powerfully, and cleanly. When it malfunctions, the entire powertrain is compromised.
From the Diagnostic Bay
I once had a 2001 Chevy Express van come in that had been to three other shops. The owner had replaced all four oxygen sensors, the mass airflow sensor, and even the fuel pump, but it still ran poorly and threw random lean codes. After hooking up our professional scan tool, we noticed the short-term fuel trim data was completely erratic and unresponsive. Instead of chasing more sensors, we monitored the command signals from the PCM itself. We found the driver circuit for the upstream O2 sensor was failing internally, providing garbage data to the rest of the system. We installed a VIN-programmed PCM like this one, performed a quick CASE relearn, and the van ran perfectly. It’s a classic case of treating the disease, not just the symptoms.
Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A sudden, unexplained drop in fuel mileage.
- ✔ The engine cranks but refuses to start.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Intermittent issues that seem to have no logical cause.
Why Choose Our Programmed 1999-2002 Savana PCM?
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. Our service sets this PCM apart. When you purchase from us, you’re not just getting a part; you’re getting a complete, ready-to-install solution. We use your vehicle’s unique Vehicle Identification Number (VIN) to flash the module with the latest, most up-to-date software directly from GM. This critical step ensures that the PCM is perfectly matched to your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. This 1999-2002 Savana PCM arrives at your door ready for a straightforward installation, saving you time, money, and the headache of coordinating with a programming service.
Installation and Setup
Physically installing the module is typically a simple process. First, disconnect the negative battery terminal. Locate your old PCM (often in the engine bay, on the driver’s side fender, or near the battery), carefully disconnect the wiring harnesses, and unbolt it. Install the new module in its place, reconnect the harnesses, and then reconnect the battery. While the vehicle will start and run with our programming, for optimal performance and to clear certain codes (like P1336), a Crankshaft Variation Relearn (CASE relearn) procedure is recommended. This requires a bi-directional scan tool and can be performed by most professional repair shops.
This module is a direct replacement for multiple part numbers, including: 16263494, 16265035, 8162634940, 218-11787, and 21811787. Restore the heart of your vehicle’s electronics with a reliable, professionally programmed PCM. Get your truck or van back to peak operating condition and order yours today.
Frequently Asked Questions
Do I need to program this module?
No. We handle the programming for you before shipment. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your vehicle.
Where is the PCM located on my vehicle?
The location varies by model. On many GM trucks and vans from this era, it’s found in the engine compartment, either on the driver’s side inner fender, near the battery, or on the firewall.
What is a CASE relearn and is it required?
A CASE (Crankshaft Angle Sensor Error) relearn synchronizes the PCM with the crankshaft position sensor. While your vehicle will run without it, performing this procedure with a capable scan tool is highly recommended to ensure optimal engine timing, prevent false misfire codes, and turn off the Check Engine Light for code P1336.
How do I provide my VIN?
You can add your 17-digit VIN in the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship your part until we have the VIN.
What part numbers does this module replace?
This PCM is a direct replacement for several part numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify one of these numbers matches your original part.