Description
Part Description
This engine control module (PCM) was removed from a 2001 Mercury Grand Marquis and serves as the electronic brain that manages engine operations. The unit has been inspected by our technicians and is currently on the shelf ready for immediate shipment. This OEM Mercury part ensures proper engine management and performance.
The engine control module is a critical component that controls fuel injection, ignition timing, emissions systems, and other vital engine functions. PCMs commonly fail due to electrical surges, water damage, or internal component degradation over time. When your PCM fails, you may experience no-start conditions, rough idle, poor fuel economy, or check engine lights that won’t clear.
At 603 Auto Salvage, we maintain over 50,000 used auto parts in stock from more than 1,100 vehicles. Our experienced team can help you find the right PCM for your Mercury Grand Marquis. Call us today or browse our online inventory to find quality used parts at affordable prices. 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 (PCM) – Electronic Brain Box |
| Interchange # | 5987B |
| OEM Part Number | 1W7F-12A650-CF |
| Side | N/A |
| Part Grade | X — Inspected and ready to ship – stored on shelf |
| Warranty | 90-Day Warranty (Standard warranty for electronic control modules) |
| Type | Used OEM |
Vehicle Information (Donor)
| Year / Make / Model | 2001 MERCURY GRANDM |
| VIN | N/A |
| Vehicle Stock # | PCM5639 |
Our Testing & Inspection Process
Every part at 603 Auto Salvage is inspected before listing. Here is what was verified on this Engine Control Module (PCM) – Electronic Brain Box:
| ✅ Connector Pins | All pins intact and free of corrosion |
| ✅ Housing Integrity | No cracks or damage to plastic housing |
| ✅ Circuit Board | Visually inspected for burn marks or component damage |
| ✅ Mounting Tabs | Secure and undamaged for proper installation |
Compatibility — What Vehicles Does This Part Fit?
Based on interchange #5987B, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2001 | Mercury | Grand Marquis | Verify part number 1W7F-12A650-CF matches your vehicle – 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
How do I know if my Mercury Grand Marquis PCM is bad?
Common symptoms include no-start conditions, rough idle, stalling, poor fuel economy, transmission shifting issues, and check engine lights that return after clearing. A diagnostic scan can confirm PCM-related trouble codes.
Does this PCM need to be programmed for my 2001 Grand Marquis?
Yes, this PCM will likely need to be programmed or flashed with your vehicle’s specific calibration data. Most automotive locksmiths or dealerships can perform this service.
What causes PCM failure in Mercury vehicles?
PCMs commonly fail due to electrical surges from jump-starting or alternator issues, water damage from flooding, overheating, or simply age-related component degradation after years of use.
Is this the same PCM used in Ford Crown Victoria?
Many Ford and Mercury models from this era shared similar PCMs, but exact compatibility depends on engine size and options. Contact us with your VIN to verify fitment.
Can I install this PCM myself?
While physically installing the PCM is straightforward, it requires programming to match your vehicle’s VIN and calibration. Professional installation and programming is recommended for proper operation.
Related Parts & Resources
OEM Part Numbers & Cross-Reference
Looking for this part by number? Here are the reference numbers:
| Ford Part Number | 1W7F-12A650-CF |
| Interchange Number | 5987B |
| Stock Number | PCM5639 |
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 old PCM to prevent electrical damage
- Take photos of connector locations before disconnecting wiring harnesses
- Handle the PCM carefully and avoid touching circuit board components
- Have the PCM programmed immediately after installation for proper operation
🔍 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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