Get Your GM Truck Running Right Again
Is your 1999 Cadillac Escalade, Chevy Tahoe, or GMC Yukon giving you headaches? If you’re dealing with frustrating no-start conditions, random stalling, a persistent check engine light, or erratic engine performance, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, when the PCM goes down, it takes the whole system with it. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.
This is a dependable, tested, and pre-programmed replacement PCM, part number 09355699. We take the guesswork and high cost out of the repair. Instead of towing your truck to a dealership for an expensive new part and programming fees, we handle the critical software flashing for you. Simply provide your vehicle’s VIN during checkout, and we’ll program this module with the latest GM factory updates specific to your truck. It arrives at your door ready for a straightforward installation.
From the Diagnostic Bay
I remember a 1998 Chevy K1500 that came into my shop on a tow truck. The owner was at his wit’s end. It would crank but never start, and he’d already replaced the fuel pump and ignition coil. His scanner was throwing a P0601 ‘Internal Control Module Memory Check Sum Error.’ This code is a dead giveaway. After confirming power and ground to the PCM connectors were good, we knew the computer itself was the culprit. We sourced a quality used module like this one, programmed it to his VIN, and had him back on the road in under an hour after it arrived. It’s a classic failure on these GMT400 trucks, and a pre-programmed module is the fastest, most effective fix.
Is Your GM Truck or SUV Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- ✔ Complete no-start or intermittent starting issues.
- ✔ Engine stalling unexpectedly while driving or at idle.
- ✔ A steady or flashing Check Engine Light with specific DTCs.
- ✔ Common diagnostic trouble codes like P0601, P0605, or P0606 (Internal Processor Faults).
- ✔ Poor fuel mileage and decreased engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with scan tools.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle with basic tools. Follow these steps for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery. Vans like the Express and Savana may have it in the LH rear engine compartment.
- Disconnect the Wiring: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts or nuts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): While we program the module to your VIN, some GM vehicles of this era require a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your vehicle’s specific procedure if it doesn’t start immediately.
Verified Vehicle Compatibility
This module, identified by service number 09355699, is a direct replacement for a wide range of GM vehicles. It is interchangeable with part numbers 16266645, 16250279, 16258815, and 09366810. Please verify your original part number or consult the list below to ensure proper fitment for your truck, van, or SUV.
Cadillac:
- Escalade: 1999
Chevrolet Trucks & SUVs:
- 1500/2500/3500 Pickup: 1998-1999
- Suburban 1500/2500: 1998-1999
- Tahoe: 1998-1999
- Blazer S10: 1998
- S10 Pickup: 1998
GMC Trucks & SUVs:
- 1500/2500/3500 Pickup (Sierra): 1998-1999
- Yukon & Yukon XL: 1998-1999
- Jimmy S15: 1998
- Sonoma S15: 1998
- Envoy: 1998
Chevrolet & GMC Vans:
- Express 1500/2500/3500: 1998-1999
- Savana 1500/2500/3500: 1998-1999
- Astro / Safari: 1998
Oldsmobile / Isuzu:
- Bravada: 1998
- Isuzu Hombre: 1998
Note: This is a comprehensive list. Always match the ID number 09355699 for guaranteed compatibility.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, such as fuel injection, ignition timing, and shift points, to ensure optimal performance, fuel economy, and emissions.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your specific vehicle, including engine size, transmission type, and other options. This ensures it works correctly right out of the box.
Is this part difficult to install?
For most DIYers with basic hand tools, this is a straightforward job. It involves disconnecting the battery, unplugging the old module, swapping it with the new one, and reconnecting everything. Please see our installation guide above for more details.
Is this a used part?
Yes, this is a fully functional, tested computer sourced from a salvaged vehicle. We inspect and program each unit to ensure it meets or exceeds original factory performance, providing a reliable and cost-effective repair.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0606), then yes, this module will resolve the issue. However, if the light is on for another reason (e.g., a bad oxygen sensor), that separate issue will still need to be addressed.