Restore Your GM Truck’s Performance and Reliability
If you’re battling frustrating issues like a persistent check engine light, erratic engine behavior, or transmission shifting problems in your GMC Yukon or other GM truck, the culprit is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can create a cascade of problems that are difficult to diagnose. This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and extra cost out of the repair by programming this module specifically for your vehicle using your VIN. It arrives at your door with the latest GM factory software updates, ensuring optimal performance and communication with all other vehicle systems.
A Technician’s Notebook: The Ghost in the Machine
I remember a 2000 Yukon Denali that came into the shop with a problem that had stumped two other mechanics. The owner complained of random stalling at traffic lights and a harsh 1-2 shift that only happened when the engine was warm. There were no consistent trouble codes, just a history of random sensor faults. After checking all the usual suspects—fuel pressure, ignition system, and wiring harnesses—I focused on the PCM. On these GMT400/800 platform trucks, I’ve seen internal solder joints on the PCM board crack from years of heat cycles and vibration. This creates intermittent connections that are impossible to trace with a simple test. We installed a VIN-programmed PCM, and the truck ran perfectly. The ghost was gone. This is a classic failure mode, and a pre-programmed module is the most effective fix.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Stored diagnostic trouble codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault)
- ✔ Engine stalling, stumbling, or rough idling
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Poor fuel economy and noticeable loss of power
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers can handle in their own driveway. Our VIN-programming service means you won’t need a trip to the dealer. Follow these general steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the PCM: On most compatible trucks and SUVs (like the Yukon, Tahoe, Silverado), the PCM is in the engine bay on the driver’s side, near the firewall or under the battery tray. On Express and Savana vans, it’s typically found in the LH rear of the engine compartment.
- Disconnect the Module: Carefully unplug the electrical connectors. These GM connectors have locking tabs that need to be released. Avoid forcing them. Once unplugged, unbolt the module from its bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely plug in the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Relearn Procedure: After installation, you may need to perform a security relearn (often called Passlock or VATS relearn). This procedure is simple and involves cycling the key in the ignition. Instructions are readily available online for your specific model and can typically be completed in about 30 minutes without special tools.
Verified Vehicle Compatibility List
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. To ensure a perfect match, please provide your VIN upon purchase. This part fits a wide range of GM vehicles, including:
- Cadillac Escalade: 1999-2000
- Chevrolet Trucks: 1500/2500/3500 Pickups (1999-2000), S10 (1998-2000), Blazer (1998-2000), Tahoe (1999-2000), Suburban (1999)
- Chevrolet Vans: Express 1500/2500/3500 (1999-2002), Astro (1999-2001)
- GMC Trucks: 1500/2500/3500 Pickups & Sierra (1999-2000), S15/Sonoma (1998-2000), Jimmy (1998-2000), Yukon & Yukon Denali (1999-2000), Envoy (1998-2000)
- GMC Vans: Savana 1500/2500/3500 (1999-2002), Safari (1999-2001)
- Oldsmobile Bravada: 1998-2000
- Isuzu Hombre: 1998-2000 (4.3L V6)
Note: Please refer to the detailed fitment list in the product data to confirm specific options and engine compatibility. Providing your VIN is the best way to guarantee a correct match.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory calibration file for your specific truck or van. This includes information about the engine, transmission, emissions equipment, and other options. Programming the PCM with this data ensures it works perfectly right out of the box.
Is this a simple plug-and-play installation?
Yes, for the most part. The module is programmed before shipping. However, on many of these GM vehicles, you will need to perform a simple Security Relearn Procedure after installation to sync the new PCM with your vehicle’s anti-theft system. This takes about 30 minutes and does not require any special scan tools.
Will this fix my transmission shifting issues?
In many cases, yes. The PCM controls transmission line pressure and shift points based on input from various sensors. If the PCM is faulty, it can cause harsh shifts, delayed shifting, or hunting for gears. This module, with its updated software, can resolve many electronically-controlled transmission problems.
Do I need to send my old PCM back?
No core charge is required for this part. You can keep your old module or recycle it locally.
What if my part number is slightly different?
This module is a compatible replacement for several part numbers, including 16263494 and 16265035. As long as your vehicle is on the compatibility list, providing your VIN will ensure we send you the correct, programmed hardware for your application.