Description
Part Description
This Engine Control Module (ECM) was removed from a 2005 Pontiac Bonneville equipped with a 3.8L engine. The electronic brain box has been professionally inspected and tested to ensure proper functionality. It is currently on our shelf and ready for immediate shipment to get your vehicle back on the road.
The Engine Control Module is the central computer that manages your engine’s performance, controlling fuel injection, ignition timing, emissions systems, and other critical functions. When an ECM fails, your vehicle may experience poor performance, stalling, rough idle, or fail to start entirely. A faulty ECM can also trigger check engine lights and cause your vehicle to fail emissions testing.
At 603 Auto Salvage, we maintain an inventory of over 50,000 quality used auto parts from more than 1,100 vehicles. Our experienced team carefully inspects each component to ensure reliability and performance. Browse our extensive online catalog or contact us to find the exact part you need for your repair. 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 # | 5555 |
| OEM Part Number | 12583827 |
| Side | N/A |
| Part Grade | X — Inspected and tested, ready to ship from shelf |
| Warranty | 90-Day Warranty (Standard warranty for electronic control modules) |
| Type | Used OEM |
Vehicle Information (Donor)
| Year / Make / Model | 2005 PONTIAC BONNEV |
| VIN | N/A |
| Vehicle Stock # | PCM4019 |
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:
| ✅ Circuit Board Inspection | No visible damage, corrosion, or burnt components |
| ✅ Connector Pins | All pins straight and free of corrosion |
| ✅ Housing Integrity | Case intact with no cracks or damage |
| ✅ Internal Components | All internal circuits and components appear functional |
Compatibility — What Vehicles Does This Part Fit?
Based on interchange #5555, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2005 | Pontiac | Bonneville | 3.8L 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 2005 Pontiac Bonneville?
Yes, most ECMs require programming to match your vehicle’s VIN and specific configuration. This should be done by a qualified technician with the proper diagnostic equipment.
How do I know if my Engine Control Module is failing?
Common symptoms include check engine lights, poor fuel economy, rough idle, stalling, or the vehicle not starting. A diagnostic scan can help confirm ECM-related fault codes.
Is this ECM compatible with all 2005 Pontiac Bonneville models?
This ECM is specifically for 3.8L engines. Contact us with your VIN to verify exact compatibility with your specific vehicle configuration.
What causes Engine Control Modules to fail?
ECMs can fail due to electrical surges, water damage, overheating, or simply age-related component degradation. Proper installation and electrical system maintenance help prevent premature failure.
Can I install this ECM myself?
While physically installing an ECM is straightforward, programming requires specialized diagnostic equipment. We recommend professional installation to ensure proper programming and functionality.
Related Parts & Resources
OEM Part Numbers & Cross-Reference
Looking for this part by number? Here are the reference numbers:
| GM Part Number | 12583827 |
| Service Code | YKBM |
| Engine Application | 3.8L V6 |
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 | $100-150 | 30–60 days | Varies in quality and testing |
| 603 Auto Salvage | $75 | 90-Day Warranty | Tested, Grade X, ships in 24hrs |
Installation Notes
- Disconnect battery before removing or installing ECM to prevent electrical damage
- Handle the ECM carefully and avoid touching circuit board components
- Ensure all electrical connections are clean and properly seated
- Have the ECM professionally programmed to your vehicle’s VIN after 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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