Restore Your Van’s Core Performance and Reliability
Is your 2005-2007 Chevy Express 1500 van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen these symptoms countless times, and they often point directly to a failing Powertrain Control Module (PCM). The PCM is the brain of your vehicle, managing everything from fuel mixture and ignition timing to transmission shift points. When it falters, your van’s performance and dependability suffer, which can be a major problem for a workhorse vehicle you rely on daily.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and high cost out of the equation by pre-programming this module with the latest official GM software updates, specifically matched to your van’s unique Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. Simply provide us with your VIN after purchase, and we’ll handle the critical software flashing before it even ships. This ensures seamless communication between the new module and your vehicle’s systems, restoring its original performance and efficiency.
Case Study: A Tricky Diagnosis
I remember a 2006 Express 2500 work van that came into my bay with a complaint of intermittent stalling at stoplights and a random P0606 (PCM Processor Fault) code. The owner had already replaced the spark plugs and a coil pack with no success. After verifying the power and ground circuits to the PCM were solid, we suspected an internal module failure. The intermittent nature of the problem was frustrating for the owner, who was losing work time. We installed a VIN-programmed PCM just like this one. The key was ensuring the software was correct for his specific van. After the install and a quick CASE relearn, the van ran perfectly. The stalling vanished, and the owner was back on the road the same day, avoiding a costly, multi-day stay at the dealer. This highlights how a correctly programmed module is the definitive fix for these specific electronic issues.
Is Your Express Van Showing These Signs?
A failing PCM can cause a wide range of frustrating issues. If you’re experiencing any of the following, this module is the likely solution your vehicle needs:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or U0100
- ✔ Engine stalling or shutting off while driving
- ✔ Rough or erratic idling
- ✔ Harsh or incorrect transmission shifting
- ✔ A complete no-start condition where the engine cranks but won’t fire
- ✔ Reduced fuel economy
A Straightforward Guide to Installation
Replacing the 2005-2007 Express 1500 PCM is a manageable job for a DIYer with basic tools. Follow these steps for a successful installation. On these vans, the PCM is typically located in the engine compartment on the left-hand (driver’s) side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow the system capacitors to discharge.
- Locate the PCM: Find the module in the LH rear of the engine compartment. It’s a metal box with several large electrical connectors.
- Disconnect Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. These connectors have release tabs; do not force them.
- Remove the Old Module: Unbolt the old 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 electrical connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Step (Important): While the module is programmed to your VIN, you may need to perform a Crankshaft Variation Relearn procedure (often called a CASE relearn) with a capable scan tool to prevent a P1336 trouble code. Many local repair shops can perform this service for a minimal fee if you don’t have the tool.
Verified Fitment Across the GM Lineup
This Powertrain Control Module (Part No. 89017749) is a direct replacement for service numbers 12589462 and 12602801. It is guaranteed to fit a wide range of GM vehicles. Please verify your model and year below:
AVALANCHE 2500 05-06 (LH front under battery)
BLAZER S10/JIMMY S15 05 (RH front engine compartment)
CTS 04-05 V-Series (RH engine compartment, ID 12589462 or 12602801)
EXPRESS 1500 VAN 05-07 (LH rear engine compartment)
EXPRESS 2500 VAN 05-07 (LH rear engine compartment)
EXPRESS 3500 VAN 05-07 (LH rear engine compartment)
SAFARI (GMC) 05 (LH front by battery)
SAVANA 1500 VAN 05-07 (LH rear engine compartment)
SAVANA 2500 VAN 05-07 (LH rear engine compartment)
SAVANA 3500 VAN 05-07 (LH rear engine compartment)
SIERRA 1500 PICKUP 05-07 Classic (LH front under battery, 4.3L)
SIERRA 2500 PICKUP 05-07 Classic (LH front under battery, 8.1L Gasoline)
SIERRA 3500 PICKUP 05-07 Classic (LH front under battery, 8.1L Gasoline)
SILVERADO 1500 PICKUP 05-07 Classic (LH front under battery, 4.3L)
SILVERADO 2500 PICKUP 05-07 Classic (LH front under battery, 8.1L Gasoline)
SILVERADO 3500 PICKUP 05-07 Classic (LH front under battery, 8.1L Gasoline)
SUBURBAN 2500 05-06 (LH front under battery, 8.1L)
YUKON XL 2500 05-06 (LH front under battery, 8.1L)
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software calibration from GM for your van’s specific engine, transmission, and options. This ensures perfect compatibility and performance, just like a new module from the dealer.
Is this a simple plug-and-play installation?
Mostly, yes. Because we program it to your VIN, it eliminates the most difficult step. However, for many GM vehicles, a Crankshaft Variation (CASE) relearn is required after installation to prevent a trouble code. This procedure requires a bi-directional scan tool, and most local shops can perform it quickly.
Will this fix my transmission shifting problems?
If the shifting issues are caused by the PCM, then yes. The PCM controls transmission line pressure and shift points. A failing module can cause harsh or erratic shifting. If the problem is mechanical within the transmission, this part will not fix it.
How do I find my original part number to check compatibility?
Your original part number is printed on a sticker on the PCM itself. You can compare it to the compatible numbers listed: 89017749, 12589462, or 12602801. However, our VIN programming guarantees compatibility even if your number isn’t an exact match.