Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Express, GMC Savana, S10, or Silverado suffering from erratic engine behavior, poor fuel economy, or a persistent Check Engine Light? These are classic symptoms of a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can cause a wide range of frustrating and potentially damaging issues. This replacement PCM, part number 16265035, is the definitive solution to get your vehicle running reliably again.
The Brain of Your Engine: Why a Healthy PCM is Crucial
Think of the PCM as the conductor of an orchestra. It takes in data from dozens of sensors throughout your engine and drivetrain, processes it in real-time, and sends out precise commands to actuators like fuel injectors and ignition coils. A faulty module can misinterpret sensor data or send incorrect commands, leading to a cascade of problems. Ignoring these symptoms can lead to more severe issues, including catalytic converter damage or complete engine shutdown. Replacing a faulty module is not just about fixing a problem; it’s about restoring the vehicle’s original efficiency, power, and reliability.
From the Diagnostic Bay
We had a 2001 GMC Savana 3500 work van towed in with a no-start condition. The owner had already replaced the battery, starter, and fuel pump, but it would only crank. After checking for spark and fuel pressure, which were present, we hooked up our diagnostic scanner. Communication with the PCM was intermittent at best. We noticed some corrosion on the PCM connectors, but even after cleaning them, the issue persisted. We connected a test module, and the van fired right up. The original PCM had an internal failure that prevented it from commanding the injectors to fire correctly. A new, programmed module had the van back on the road and earning money for its owner the same day.
Symptoms of a Failing 1999-2002 Savana 3500 PCM
If your vehicle is experiencing any of the following issues, a faulty PCM could be the culprit. A proper diagnosis is always recommended, but these symptoms are strongly indicative of a control module problem.
- ✔ Check Engine Light: The light is on, and you may have codes related to sensors, emissions, or internal module failure.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially under load.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with good fuel pressure and spark.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in MPG is a common sign of incorrect fuel management.
- ✔ Harsh or Failed Shifting: The transmission may shift erratically, slam into gear, or fail to shift at all.
- ✔ Failed Emissions Test: Inability to pass a smog check is often linked directly to PCM faults.
- ✔ Intermittent Electrical Issues: Gauges acting strangely or other electronic systems behaving unpredictably.
A True Plug-and-Play Solution
What sets this module apart is our professional programming service. We don’t just send you a generic part. When you purchase from us, you provide your vehicle’s 17-digit Vehicle Identification Number (VIN). We then flash the module with the latest, most up-to-date software directly from GM for your specific vehicle. This critical step ensures that the PCM operates exactly as the manufacturer intended, accounting for all your vehicle’s specific options and calibrations. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money. Once you receive the module, installation is straightforward, and in most cases, you will only need to perform a simple security relearn procedure which can be done without special tools.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787, ensuring wide compatibility across a range of GM trucks and vans from the late 90s to the early 2000s. Please verify your part number and consult the fitment list to ensure this is the correct component for your vehicle.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. You can typically add it as a note during checkout or reply to your order confirmation email. We cannot ship the module until we receive your VIN.
Is this a difficult part to install?
Installation is generally simple. It involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in reverse order. The most important step after installation is performing the security relearn procedure, which allows the module to communicate with your vehicle’s anti-theft system. Instructions for this procedure are widely available online or in service manuals.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission solenoids and shift points. If your shifting problems are electronic in nature and caused by a faulty module, this part will resolve them. However, it will not fix mechanical issues within the transmission itself.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM is a more advanced type of ECM that controls both the engine and the transmission functions, which is standard on most vehicles this module fits.
Do I need to send my old module back?
This listing does not require a core return. You can keep your old module, though we always recommend recycling old electronics responsibly.