Restore Peak Performance to Your GM Truck or SUV
Is your 1998-1999 GMC Yukon, Tahoe, or Suburban running rough, stalling unexpectedly, or throwing confusing check engine light codes? As a technician with over two decades of experience, I’ve seen countless cases where the Powertrain Control Module (PCM) is the hidden culprit. This isn’t just a replacement part; it’s a direct solution to restore your vehicle’s drivability, fuel efficiency, and reliability. This module, part number 09355699, arrives at your door programmed with the latest GM software updates, tailored specifically to your vehicle’s VIN. This eliminates the need for an expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I remember a ’99 Suburban that came into my shop with a frustrating intermittent no-start condition. The owner had already replaced the fuel pump and ignition coil. After hooking up my scanner, I noticed communication with the PCM would drop out completely once the engine bay warmed up. These older GMT400 platform PCMs are notorious for failing due to heat cycles and vibration. We installed a correctly programmed PCM, and the truck fired up instantly and ran perfectly. This isn’t just about replacing a part; it’s about correctly diagnosing the root cause and providing a lasting fix.
Common Signs of a Failing PCM
A failing engine computer can cause a wide range of issues that are often misdiagnosed. If you’re experiencing any of the following, your PCM could be the problem. This is especially true if you see diagnostic trouble codes (DTCs) like P0601 or P0606, which point to internal module failure.
- ✔ Check Engine Light is on with communication error codes.
- ✔ Engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Inconsistent or non-functional gauges.
A Straightforward Guide to Installation
Replacing the 1998-1999 Yukon PCM is a job most DIY enthusiasts can handle in their own driveway. Since we program the module before shipping, no special scan tools are required for the installation itself.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. The connectors have locking tabs that need to be released.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you may need it for the new installation.
- Install the New PCM: Mount your new, pre-programmed module onto the bracket and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please ensure your vehicle and original part ID match the list below. This part is compatible with service numbers 16250279, 09366810, and 09355699.
1999 CADILLAC ESCALADE
1998-1999 CHEVROLET/GMC C/K 1500, 2500, 3500 PICKUP (Gasoline)
1998-1999 CHEVROLET/GMC SUBURBAN (Gasoline)
1998-1999 CHEVROLET TAHOE & GMC YUKON
1998-1999 CHEVROLET ASTRO & GMC SAFARI
1998 CHEVROLET S10 / GMC SONOMA (4.3L)
1998 CHEVROLET BLAZER / GMC JIMMY / OLDSMOBILE BRAVADA
1998 CHEVROLET EXPRESS & GMC SAVANA VANS (Gasoline)
1998 ISUZU HOMBRE (4.3L)
…and other models sharing the same part ID. Cross-reference your original part number to confirm fitment.
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the module. Simply provide us with your vehicle’s 17-digit VIN during checkout, and it will arrive ready to install.
What is a VIN and where do I find it?
The VIN is your Vehicle Identification Number. It’s a unique 17-digit code found on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Is this a simple plug-and-play installation?
Yes, for most vehicles. After physically installing the module, you may need to perform a simple security relearn procedure, which does not require any special tools. Instructions are readily available online or in your vehicle’s service manual.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is faulty, it can cause poor shift quality, and replacing it with a properly programmed unit often resolves these issues.
What makes your modules a better choice?
Our modules are meticulously inspected and then programmed with the latest official GM software for your specific VIN. This ensures optimal performance and reliability, solving the problem correctly the first time without a costly trip to a mechanic for programming.