Restore Your GM Truck’s Performance and Reliability
Is your 1999 Cadillac Escalade, Chevy Tahoe, or GMC Yukon acting up? If you’re dealing with frustrating issues like a no-start condition, a persistent Check Engine Light, rough idling, or erratic transmission shifting, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, when the PCM fails, it can cause a cascade of problems that can leave you stranded. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.
This is a dependable, tested, used OEM engine computer, part number 16258815, that serves as a direct replacement for a wide range of 1998-1999 GM trucks, vans, and SUVs. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives ready for installation, loaded with the latest GM software updates to ensure optimal engine performance and efficiency. You get a cost-effective solution without the high price tag or programming headaches of a dealership visit.
Case Study: A Tricky Diagnosis
I remember a ’99 GMC Suburban that came into my shop with a complaint that stumped two other mechanics. The owner said it would randomly refuse to start, but only when the engine was warm. There were no consistent trouble codes, just an occasional communication error (U-series code) that would disappear. We checked fuel pressure, spark, and all the usual suspects—everything seemed fine. On a hunch, I monitored the PCM’s live data during a hot restart. I noticed the 5-volt reference signal to the sensors would drop out intermittently. After ruling out a wiring short, we pinpointed the PCM’s internal voltage regulator as the culprit. It was failing under heat soak. We installed one of these VIN-programmed PCMs, and the problem was solved instantly. It’s a classic example of how a failing computer can create ghost-like symptoms that are maddening to diagnose.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Vehicle will not start or is difficult to start
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stored diagnostic trouble codes (DTCs) for internal module failure, such as P0601, P0602, or P0605
- ✔ Poor or erratic automatic transmission shifting
- ✔ Reduced fuel economy and engine performance
- ✔ Intermittent stalling or rough idling
- ✔ Communication issues with diagnostic scan tools
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in their own driveway with basic hand tools. Our pre-programming service makes it a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these vehicles, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old PCM. There are usually several color-coded connectors.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new PCM. Reconnect the negative battery terminal.
- Security Relearn Procedure: In many cases, you will need to perform 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. This allows the vehicle’s anti-theft system to recognize the new PCM. After this, your vehicle should start and run correctly.
Verified Vehicle Compatibility
This module is a direct replacement for service ID 9355699 and part number 16258815. It is also interchangeable with part numbers 09355699, 16266645, 16250279, and 09366810. It fits a wide variety of popular GM models, including:
- Cadillac Escalade: 1999
- Chevy/GMC C/K 1500, 2500, 3500 Pickups: 1998-1999
- Chevy/GMC Suburban 1500, 2500: 1998-1999
- Chevy Tahoe / GMC Yukon: 1998-1999
- Chevy Express / GMC Savana 1500, 2500, 3500 Vans: 1998-1999
- Chevy Astro / GMC Safari: 1998
- Chevy S10 / GMC Sonoma: 1998
- Chevy Blazer / GMC Jimmy / Oldsmobile Bravada: 1998
- GMC Envoy: 1998
- Isuzu Hombre: 1998
Please ensure your original module has one of the compatible part numbers listed above for guaranteed fitment.