Restore Peak Performance to Your GM Truck or Van
If you’re wrestling with frustrating issues like a persistent check engine light, rough idling, stalling, or a no-start condition in your 1998-1999 Suburban 1500, the Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen how a failing engine computer can mimic a dozen other problems, leading to wasted time and money on incorrect repairs. This reliable, tested PCM is your direct-fit, cost-effective solution to get your vehicle running smoothly again.
This isn’t just a part in a box. We take this genuine, used OEM module and professionally program it with the latest GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This critical step ensures that the fuel maps, transmission shift points, and emissions parameters are perfectly matched to your truck’s original specifications, making installation as simple as possible.
Is Your Truck’s Brain on the Fritz?
A failing PCM can cause a wide range of confusing symptoms. Here are some of the most common signs I’ve diagnosed in my shop that point to a faulty engine computer:
- ✔ Unexplained Check Engine Light (CEL), sometimes with codes like P0601 or P0606.
- ✔ Engine cranks but refuses to start.
- ✔ Rough or erratic idling.
- ✔ Stalling for no apparent reason, either while driving or at a stop.
- ✔ Poor fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions test.
A Technician’s Notebook: The Intermittent Stall
I once had a ’99 Tahoe in the bay that was driving its owner crazy. It would run perfectly for days, then suddenly stall at a red light and refuse to restart for 10-15 minutes. No consistent codes were stored, just a history of random sensor faults. After checking all the usual suspects—fuel pressure, ignition system, grounds—we hooked up a scope to the PCM outputs. We found that the injector driver circuit inside the module would intermittently drop out when it got hot. Swapping in a correctly programmed PCM like this one solved the problem instantly. It’s a classic case where the central computer was the ghost in the machine.
The Reliable Fix with a Programmed 1998-1999 Suburban 1500 PCM
Choosing this module means you’re getting a part that is not only guaranteed to fit but is also prepared to work with your vehicle right out of the box. We handle the complex programming so you don’t have to pay for expensive dealer services or specialized tools. This is the most efficient path to resolving complex electronic issues and restoring the dependability you expect from your GM vehicle.
Plug-and-Play Installation: Get Back on the Road Fast
Installing your new PCM is a straightforward job for a DIYer with basic tools. Follow these steps for a successful replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released before pulling.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for the specific procedure for your vehicle.
Verified Vehicle Compatibility
This module is a direct replacement for service number 9355699 and is compatible with a wide range of GM vehicles. Please verify your part number and vehicle from the list below to ensure proper fitment.
SUBURBAN (1500/2500) 1998-1999 (Gasoline)
TAHOE/YUKON 1998-1999 (Gasoline)
ESCALADE 1999
EXPRESS/SAVANA VANS (1500/2500/3500) 1998-1999 (Gasoline)
ASTRO/SAFARI 1998
BLAZER S10/JIMMY S15 1998 (4.3L)
S10/S15/SONOMA 1998 (4.3L)
BRAVADA 1998 (4.3L)
ENVOY 1998 (4.3L)
ISUZU HOMBRE 1998 (4.3L)
Note: Some 4.3L models have specific build date options (w/o ZN4). Please match your service ID.
Frequently Asked Questions
Do I need to do anything after I buy this PCM?
Yes. After your purchase, you must provide us with your vehicle’s 17-digit VIN. We need this to program the module with the correct software and calibrations for your specific truck or van before we can ship it.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This allows us to offer a reliable and affordable solution. Each unit is inspected and programmed to ensure full functionality.
Will I need a mechanic to install this?
While professional installation is always an option, this part is designed for straightforward DIY installation. Because it comes pre-programmed to your VIN, no special scan tools are needed for programming. You may need to perform a simple security relearn procedure, which can be done without tools.
What is a security relearn or CASE relearn?
The security relearn (or Passlock relearn) syncs the new PCM with your vehicle’s anti-theft system. The CASE (Crankshaft Angle Sensor Error) relearn calibrates the crankshaft position sensor to the new PCM. While the security relearn is often a simple key-on procedure, a CASE relearn may require a capable scan tool. In many cases, the vehicle will run fine without an immediate CASE relearn, but it is recommended for optimal performance.
How do I find my PCM’s part number?
The part number (or service number) is printed on a sticker on the PCM itself. You will need to locate the module in your engine bay to read the label. Matching this number to our compatibility list ensures you’re ordering the correct part.