Description
Part Description
This Engine Control Module (ECM), also known as the engine brain box, was removed from a 2002 GM Trucks Sierra 2500 with gasoline engine. Located under the hood on the left front side under the battery, this electronic control unit has been professionally inspected and is currently on our shelf ready to ship immediately.
The Engine Control Module is the central computer that manages your truck’s engine performance, fuel injection, ignition timing, and emissions systems. When ECMs fail, symptoms include poor fuel economy, rough idling, stalling, check engine lights, or complete no-start conditions. Common causes of ECM failure include electrical surges, water damage, or internal component degradation over time.
At 603 Auto Salvage, we maintain over 50,000 used auto parts in stock from more than 1,100 vehicles in our Plaistow, NH facility. Our experienced team can help you find the right ECM for your GM truck. Browse our online inventory or call us to verify compatibility and availability for your specific vehicle. 50,000+ parts in stock from over 1,100 vehicles. Contact us or call (603) 392-7313 for anything you need.
Part Specifications
| Part | Engine Control Module (ECM) – Electronic Brain Box |
| Interchange # | 5917 |
| OEM Part Number | 12200411 |
| Side | N/A |
| Part Grade | X — Grade X – Inspected electronic control module, ready to ship |
| Warranty | 90-Day Warranty (Standard warranty for electronic control modules) |
| Type | Used OEM |
Vehicle Information (Donor)
| Year / Make / Model | 2002 GM TRUCKS SIER25 |
| VIN | N/A |
| Vehicle Stock # | PCM1636 |
Our Testing & Inspection Process
Every part at 603 Auto Salvage is inspected before listing. Here is what was verified on this Engine Control Module (ECM) – Electronic Brain Box:
| ✅ Connector Pins | All pins intact and free of corrosion |
| ✅ Housing Integrity | No cracks or damage to ECM case |
| ✅ Internal Components | No visible damage to circuit board |
| ✅ Mounting Points | All mounting tabs and brackets intact |
Compatibility — What Vehicles Does This Part Fit?
Based on interchange #5917, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2002 | GM Trucks | Sierra 2500 | Gasoline engine – Contact us for full compatibility list |
Questions? Need a shipping quote? Call us now:
603 Auto Salvage | 233 Main St, Plaistow, NH 03865
Mon–Fri 8am–4:30pm | Sat 8am–2pm | Sun Closed
Warranty & Shipping
Frequently Asked Questions
Will this ECM need to be programmed for my 2002 Sierra 2500?
Yes, most ECMs require programming to match your vehicle’s VIN and specific configuration. We recommend having this done by a qualified technician or dealership after installation.
How do I know if my ECM is failing?
Common symptoms include check engine lights, poor fuel economy, rough idling, stalling, or no-start conditions. A diagnostic scan can help confirm ECM-related trouble codes.
What’s the difference between ECM, PCM, and ECU?
ECM (Engine Control Module) specifically controls engine functions, while PCM (Powertrain Control Module) controls both engine and transmission. ECU is a general term for Electronic Control Unit.
Is this ECM compatible with other GM truck models?
This ECM is specifically for 2002 Sierra 2500 with gasoline engine. Contact us with your VIN to verify compatibility with other GM truck models from similar years.
What causes ECM failure in GM trucks?
Common causes include electrical surges from jump-starting or alternator issues, water damage from flooding, vibration damage, and normal wear of internal components over time.
Related Parts & Resources
OEM Part Numbers & Cross-Reference
Looking for this part by number? Here are the reference numbers:
| GM Part Number | 12200411 |
| Service Number | 09386530 |
| Internal Code | 80 0191 L216361 |
Price Comparison — Why Used OEM Makes Sense
| Source | Price Range | Warranty | Notes |
|---|---|---|---|
| Dealer (New OEM) | $400-600 | 1 year | Brand new, longest wait time |
| Aftermarket | $250-400 | Varies | Non-OEM fitment, quality varies |
| Other Salvage Yards | $150-250 | 30–60 days | Varies in quality and testing |
| 603 Auto Salvage | $100 | 90-Day Warranty | Tested, Grade X, ships in 24hrs |
Installation Notes
- Disconnect battery before removing old ECM to prevent electrical damage
- Take photos of connector positions before disconnecting wiring harnesses
- Handle ECM carefully – avoid static electricity by grounding yourself first
- Ensure all connectors are fully seated and locked in place during installation
🔍 Free Fitment Check
Call us with your VIN and we will verify compatibility for free. No obligation, no pressure — just answers.
Our parts specialists check interchange data in real-time
Estimated Shipping Costs by Region
This part ships via FedEx Ground. Prices are estimates — call for an exact quote to your zip code.
| Region | Estimated Cost | Transit Time |
|---|---|---|
| New England (NH, MA, ME, VT, CT, RI) | $15 – $30 | 1–3 business days |
| Northeast (NY, NJ, PA, MD, VA) | $20 – $40 | 2–4 business days |
| Southeast (FL, GA, NC, SC, TN) | $25 – $45 | 3–5 business days |
| Midwest (OH, MI, IL, IN, WI, MN) | $30 – $50 | 3–5 business days |
| Southwest (TX, AZ, NM, OK) | $35 – $55 | 4–6 business days |
| West Coast (CA, OR, WA) | $40 – $65 | 5–7 business days |
Local pickup is always free. Free delivery within 30 miles of Plaistow, NH.
Why Buy From 603 Auto Salvage?
- 50,000+ parts in stock from over 1,100 vehicles on-site in Plaistow, NH
- Every part inspected before listing — no guesswork
- Family-owned salvage yard — real people, not a call center
- 90-Day Warranty on this part
- Fast shipping — most orders ship within 24 hours
- Competitive pricing — save 50–70% vs dealer prices
- Serving New Hampshire, Massachusetts & all 50 states
Ready to order? Call (603) 392-7313 or add to cart above. We are here to help.




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