FREE SHIPPING
Free shipping on every order — no minimum purchase required.DESCRIPTION
Mack ECM ECU Diesel Engine Computer Module (P/N 20977021 P03) — This core engine control unit is designed for Mack heavy-duty diesel trucks and fits various models equipped with compatible powertrains. This is a non-working core unit suitable for core exchanges or rebuilding projects.
Key Specifications:
- Part Number: 20977021 P03
- OEM Mack ECM/ECU component
- Diesel engine application
- Core exchange eligible
Ideal for fleet operators and repair shops performing ECM rebuilds or core exchanges at a significant cost savings compared to new units.
SHIPPING & RETURNS
SHIPPING
- Free Shipping on all orders — no minimum purchase required.
- Orders are dispatched within 24 hours of purchase (business days).
- Estimated delivery: 2–5 business days within the contiguous United States.
- Tracking information emailed as soon as your order ships.
RETURNS
- Exchanges accepted — we want you to be completely satisfied.
- If a part does not fit or is not as described, contact us within 7 days for an exchange.
- Items must be in original, unused condition and in original packaging.
WARRANTY
- 1-Year extended warranty available at additional cost — ask us for details.
FITMENT & COMPATIBILITY
Please verify that this part is compatible with your vehicle's year, make, model, and trim level before ordering. Part numbers and fitment details are listed in the product description. If you have any questions about compatibility, our team is happy to help — contact us by phone or email before purchasing.
Phone: (803) 723-7074
Email: sales@findmypart.shop
Hours: Mon–Fri, 9am–5pm EST
Recently Viewed Parts
Why Shop with Find My Part?
- SHIPS IN 24 HOURSOrders dispatched within one business day, delivered in 2–5 business days.
- EASY EXCHANGESHassle-free exchanges. Not happy? We'll make it right.
- LIVE SUPPORT
Get lightning-fast service. Start an instant chat, Mon–Fri 9am–5pm EST.