Programmed 2003 Savana 2500 PCM | Replaces 12578127 | VIN Matched

End Your Van’s Engine Troubles

Stop struggling with a poorly running 2003 Savana 2500. This Powertrain Control Module (PCM) is the solution for check engine lights, stalling, and bad fuel economy. It arrives pre-programmed to your van’s VIN with the latest GM software, making installation a breeze and saving you a trip to the dealer. Get your workhorse back on the road performing like it should. Order today for a fast, reliable fix!

$98.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06724-105 Categories: ,
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Restore Your Van’s Core Performance and Reliability

Is your 2003 GMC Savana 2500 Van giving you headaches? If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel mileage, or even a no-start condition, the problem often lies with a failing Powertrain Control Module (PCM). As the central computer for your vehicle’s engine and transmission, a faulty PCM can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; for a work van, it means lost time and money.

This replacement PCM, part number 12578127, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module specifically for your vehicle using your VIN. This means it arrives at your door loaded with the latest GM factory software updates, ensuring optimal communication between all your vehicle’s systems. You get a reliable, plug-and-play component that restores the performance and efficiency you depend on, without the expensive trip to a dealership for programming.

A Technician’s Notebook: The Intermittent Stall

I once had a 2003 Express 2500—the Savana’s twin—in my bay that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for an hour. No consistent codes were stored, just a history of random communication faults. After checking all the usual suspects like fuel pressure and grounds, we focused on the PCM. On these vans, the PCM is tucked in the rear of the engine bay, where it’s exposed to immense heat cycles. Over 20 years, those cycles can cause microscopic cracks in the circuit board. We swapped in a VIN-programmed module, and the van never had the issue again. It’s a classic case of heat-related internal failure that a new, solid-state unit solves for good.

Is Your Vehicle Showing These Telltale Signs?

  • ✔ Unexplained Check Engine Light illumination.
  • ✔ Engine stalling, stumbling, or misfiring.
  • ✔ Harsh or erratic automatic transmission shifting.
  • ✔ The vehicle won’t start, even with a good battery and starter.
  • ✔ A noticeable drop in fuel economy.
  • ✔ Failure to pass an emissions test.
  • ✔ Diagnostic codes such as P0601 (Internal Control Module Memory Check Sum Error) or U0100 (Lost Communication With ECM/PCM).

Your Straightforward Installation Guide

Installing your new 2003 Savana 2500 PCM is a manageable job for a DIYer with basic tools. Following these steps will get you back on the road quickly.

  1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
  2. Locate the PCM: On the 2003 Savana and Express vans, the PCM (or engine computer) is located in the rear of the engine compartment on the driver’s side.
  3. Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses connected to the old module. There are typically multiple connectors. Pull them straight out to avoid damaging the pins.
  4. Remove the Old Module: Unbolt the mounting bracket holding the PCM in place. Once the bolts are removed, the old module can be taken out of the vehicle.
  5. Install the New PCM: Mount your new, pre-programmed PCM into the bracket and secure the bolts. Reconnect the wiring harnesses, making sure they click securely into place.
  6. Reconnect the Battery: Reattach the negative battery terminal.
  7. Perform Security Relearn (If Needed): 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 usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual for the specific procedure.

Verified Compatibility for Your GM Vehicle

This module is a direct replacement for service number 12578127 and is compatible with a wide range of GM vehicles. Please verify your model and options below. After purchase, we require your VIN to ensure perfect programming.

Compatible with Part Numbers: 12581565, IS 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 8125781270, 88864822, 89017733

Vehicle Fitment:
AVALANCHE 2500 03 (LH front under battery)
ASTRO 03 (LH front by battery)
BLAZER S10/JIMMY S15 03 (RH front engine compartment)
CTS 04 (Base, ID 12581565, RH engine compartment)
CORVETTE 04 (ID 12581565, RH engine compartment)
EXPRESS/SAVANA 1500 VAN 03 (LH rear engine compartment)
EXPRESS/SAVANA 2500 VAN 03 (LH rear engine compartment)
EXPRESS/SAVANA 3500 VAN 03 (LH rear engine compartment)
S10/S15/SONOMA 03 (4.3L, RH front engine compartment)
SAFARI (GMC) 03 (LH front by battery)
SIERRA 1500 PICKUP 03 (4.3L, LH front under battery)
SIERRA/SILVERADO 2500 PICKUP 03 (8.1L Gasoline, LH front under battery)
SIERRA/SILVERADO 3500 PICKUP 03 (8.1L Gasoline, LH front under battery)
SUBURBAN 2500 03 (8.1L, LH front under battery)
YUKON XL 2500 03 (8.1L, LH front under battery)

Frequently Asked Questions

Why do you need my VIN number?

Your Vehicle Identification Number (VIN) is essential because it allows us to program the PCM with the exact software and calibrations for your vehicle’s specific engine, transmission, and options. This ensures seamless integration and proper function right out of the box, eliminating the need for a costly dealership visit.

Is this a simple plug-and-play installation?

Yes, for the most part. Because we pre-program the module, the physical installation is a direct swap. However, on most GM vehicles of this era, you will need to perform a security relearn procedure, which syncs the new PCM to your keys. This is a simple process you can do yourself in about 30 minutes with no special tools.

Will this fix my transmission shifting problems?

In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If your shifting issues are caused by faulty electronic signals from a failing module, this new 2003 Savana 2500 PCM will resolve them. If the problem is mechanical within the transmission itself, this will not correct it.

What if my original part number isn’t 12578127?

GM often uses multiple service numbers for the same physical part over its production life. This module replaces a long list of compatible service numbers, including 12581565, 12570557, and others listed in the compatibility section. As long as your vehicle is on the fitment list, this module will work perfectly.

Do I need to return my old PCM?

This listing does not require a core return. You can keep your old part, which saves you the time and expense of shipping it back.

Conditions & Options

Programmed to your VIN GM: 12576106

Year
Genuine OEM

Yes

MPN

12578127

Interchange part number

Condition

Refurbished

Model

SAVANA 2500 VAN

Year

2003

Brand

GM

Manufacturer Part Number

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GTIN

Does not apply

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