Welcome to 603 Auto Salvage, We Sell Quality Used Auto Parts at Affordable prices.
Welcome to 603 Auto Salvage, We Sell Quality Used Auto Parts at Affordable prices.
$75.00
Used engine control module (ECM/PCM) for 2000 Mercury Grand Marquis. This electronic control unit manages engine functions and has been inspected and is ready to ship. Interchange 5657C, Stock PCM719951.
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This engine control module (ECM/PCM) was removed from a 2000 Mercury Grand Marquis donor vehicle. The electronic control unit is located on the left side of the firewall in the engine compartment and carries ID YW7F-GD. Our technicians have inspected this module and it is currently on the shelf ready to ship.
The engine control module is the computer brain that manages critical engine functions including fuel injection, ignition timing, emissions control, and transmission shifting. These units commonly fail due to electrical surges, moisture intrusion, or internal component degradation over time. When your ECM fails, you may experience no-start conditions, rough idle, poor fuel economy, or transmission shifting problems.
At 603 Auto Salvage, we maintain over 50,000 parts in stock from more than 1,100 vehicles. Our experienced team can help you find the right ECM for your Mercury Grand Marquis. Browse our online inventory or contact 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 | Engine Control Module (ECM/PCM) – Electronic Control Unit |
| Interchange # | 5657C |
| OEM Part Number | Contact for OEM# |
| Side | N/A |
| Part Grade | X — Grade X – Inspected and ready to ship, ID YW7F-GD |
| Warranty | 90-Day Warranty (Standard warranty for electronic control modules) |
| Type | Used OEM |
| Year / Make / Model | 2000 MERCURY GRANDM |
| VIN | N/A |
| Vehicle Stock # | PCM719951 |
Every part at 603 Auto Salvage is inspected before listing. Here is what was verified on this Engine Control Module (ECM/PCM) – Electronic Control Unit:
| ✅ Connector Pins | All pins intact and free of corrosion |
| ✅ Housing Condition | No cracks or damage to module casing |
| ✅ Mounting Tabs | Secure mounting points verified |
| ✅ Internal Components | No signs of moisture damage or burning |
Based on interchange #5657C, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2000 | Mercury | Grand Marquis | Contact us for full compatibility list and programming requirements |
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
Yes, most engine control modules require programming to match your vehicle’s VIN and options. Contact your dealer or qualified technician for programming services after installation.
Common symptoms include no-start conditions, rough idle, stalling, poor fuel economy, transmission shifting problems, and illuminated check engine lights. Professional diagnosis is recommended to confirm ECM failure.
This module is specific to 2000 Mercury Grand Marquis. While some Ford products may share similar modules, compatibility depends on engine size, transmission type, and other factors. Contact us to verify fitment.
ECM replacement involves disconnecting the battery, removing the old module from the firewall mounting location, and installing the replacement. Professional installation and programming is strongly recommended for proper operation.
ECMs commonly fail due to electrical voltage spikes, moisture intrusion, extreme temperatures, vibration damage, or normal wear of internal components over time. Proper electrical system maintenance can help prevent premature failure.
Looking for this part by number? Here are the reference numbers:
| Module ID | YW7F-GD |
| Part Number | 590 |
| Location | LH Firewall, Engine Compartment |
| Source | Price Range | Warranty | Notes |
|---|---|---|---|
| Dealer (New OEM) | $350-500 | 1 year | Brand new, longest wait time |
| Aftermarket | $200-350 | 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 |
🔍 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
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.
Ready to order? Call (603) 392-7313 or add to cart above. We are here to help.
| Weight | 3 lbs |
|---|
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Drove from new york, Julie was a sweetheart asked questions to make sure that my ECU was the proper part number and was compatible with my manual Accord, price was phenomenal I highly recommend them for any parts your car may need. Definitely the best salvage yard around
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I had a great experience with 603 Auto Salvage Inc. The team was very helpful and quickly found the exact part I needed. They kept me informed and made the pickup process easy. The price was very fair, and the service was excellent. I would definitely recommend them and will use them again if I need parts in the future.
Excellent support, she helped me with my order service was fast and exactly what I needed.Very Professional.
The customer service at 603 was great. They found the part I needed very quickly and promptly notified me when it was ready to be picked up. There wasn’t any other place in the area that had what I needed. The price was very good also. I will be using them again for sure.
I had a great experience. They didn’t just look up the part I needed they took the time to explain how to install it and made sure I understood everything. I even received a call back, which I really appreciated. Everyone I spoke with was friendly and patient, and I never felt brushed off. I truly felt taken care of. Highly recommend if you want knowledgeable people who actually care about helping you. Kristy Thanks Guys!
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If you’re not getting your car parts here then what are you doing?!! The best reliable car place in New Hampshire❤️ 100000% recommended
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Purchased a wheel they had it ready the next day , not damaged, and ready for pickup. Julie was helpful at the front desk giving a specific time frame and held to it.
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Great place, have a wide selection of cars. They definitely will have what you need if not they will help a ton!
Great customer service and great prices!!! I purchased an engine that was in excellent condition and could not beat the price. The woman at the desk, Julie, was very helpful and knowledgeable. They put the engine on the back of the truck for me And secured it as well. I highly recommend this place. I will be coming here for any parts I need.
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