Restore Your Truck’s Core Performance and Reliability
Is your Silverado, Sierra, or Express van suddenly running rough, stalling, or refusing to start? A persistent Check Engine Light and confusing diagnostic codes can be frustrating, especially when they point to the vehicle’s central computer. As a technician with over two decades of experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can mimic a dozen other problems, leading to wasted time and money on unnecessary parts. This isn’t just a component; it’s the brain of your engine, and when it falters, your entire vehicle suffers.
This is your direct, reliable solution. We offer a high-quality Powertrain Control Module, service number 89017749, that arrives at your door programmed specifically for your vehicle. Simply provide us with your VIN during checkout, and our experts will flash the unit with the latest, most stable software updates directly from GM. This critical step ensures your engine, transmission, and emissions systems all communicate flawlessly, restoring the smooth operation and efficiency you depend on. Forget about costly dealership visits for programming—this module is ready for installation right out of the box.
A Technician’s Notebook
I remember a 2006 Sierra 2500 with the 8.1L that came into the shop with a maddeningly intermittent no-start condition. The owner had already replaced the battery and alternator. It would run fine for days, then suddenly refuse to crank. We checked fuel pressure, starter, and grounds—all perfect. The scanner showed intermittent communication loss with the PCM (U0100). After hooking up a lab scope, we saw the 5-volt reference signal from the PCM intermittently dropping out. It was a classic case of an internal PCM failure caused by heat cycles and vibration over the years. We installed a VIN-programmed module just like this one, and the truck has been starting reliably ever since. This single part solved a problem that had stumped others for weeks.
Is Your GM Truck or Van Acting Up?
A failing PCM can cause a wide array of symptoms. If you’re experiencing any of the following, a faulty module could be the culprit:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drop in fuel economy.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or delayed transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ No communication with the module when using a scan tool.
A Straightforward Guide to Installation
Installing your new Silverado 1500 Powertrain Control Module is a manageable job for a DIYer with basic hand tools. Follow these steps to get your truck back in top shape.
- 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 Old PCM: On most Silverado/Sierra trucks, the PCM is located in the engine bay on the driver’s side, typically under or near the battery tray. On Express/Savana vans, it’s often in the LH rear of the engine compartment.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old module. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New PCM: Mount your new, pre-programmed module in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In many cases, you may need to perform a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. 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 part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following GM models and engine configurations:
ASTRO 05 (LH front by battery)
BLAZER S10/JIMMY S15 05 (RH front engine compartment)
CTS 04-05 V-Series (RH engine compartment)
EXPRESS/SAVANA 1500 VAN 05-07 (LH rear engine compartment)
EXPRESS/SAVANA 2500 VAN 05-07 Gasoline (LH rear engine compartment)
EXPRESS/SAVANA 3500 VAN 05-07 Gasoline (LH rear engine compartment)
SAFARI (GMC) 05 (LH front by battery)
SIERRA/SILVERADO 1500 PICKUP 05-06 4.3L, w/o hybrid (LH front under battery)
SIERRA/SILVERADO 1500 PICKUP 07 Classic Style, 4.3L, w/o hybrid (LH front under battery)
SIERRA/SILVERADO 2500 PICKUP 05-06 8.1L Gasoline (LH front under battery)
SIERRA/SILVERADO 2500 PICKUP 07 Classic Style, 8.1L Gasoline (LH front under battery)
SIERRA/SILVERADO 3500 PICKUP 05-06 8.1L Gasoline (LH front under battery)
SIERRA/SILVERADO 3500 PICKUP 07 Classic Style, 8.1L Gasoline (LH front under battery)
SUBURBAN 2500 05-06 8.1L (LH front under battery)
YUKON XL 2500 05-06 8.1L (LH front under battery)
Frequently Asked Questions
How do I provide my VIN for programming?
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email with instructions. Simply reply to that email with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive your VIN.
Is any additional programming required after installation?
No, this module comes fully programmed to your VIN with the latest GM software. In some cases, a simple ‘Security Relearn’ or ‘CASE Relearn’ procedure may be needed, which can be done without special tools. Instructions are widely available online or in service manuals.
Is this a used part?
This is a professionally inspected and tested recycled OEM part. Each unit is verified for full functionality before being programmed and shipped, ensuring you receive a reliable, high-quality component.
Will this fix my truck’s specific problem?
This module will correct issues directly caused by a faulty PCM. While the symptoms listed are common indicators, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the point of failure before ordering.