Frequently Asked Questions
Shipping & Delivery
Where do your parts ship from? The majority of our physical inventory ships directly from our primary facility in Alberta. To ensure the fastest possible delivery across North America and broader availability, we also utilize a network of US partner warehouses for certain components.
What are your expected ship times? Most in-stock physical orders are processed and leave our facility within 1 to 2 business days. If a specific part requires sourcing from one of our US partner warehouses, order processing may take an additional 1 to 2 business days before shipping.
Do you ship to PO Boxes? Because we frequently ship oversized automotive parts and heavy freight, we strongly recommend providing a physical shipping address. Certain large exhaust components and heavy items cannot be delivered to PO Boxes.
Products & Services
What types of ECM calibrations do you provide? We specialize in custom ECM calibrations for many platforms, including Cummins, Duramax, and Powerstroke engines. Our tuning files support major aftermarket platforms such as EFILive, EZ LYNK, and HP.
How do I receive my custom tune files? Digital tuning files and ECM calibrations are tied to your specific vehicle’s VIN and modifications. Once your order is processed and your vehicle details are confirmed, the files are typically delivered via email or pushed directly to your cloud-based tuning device within 24 hours or quicker (during business hours).
Orders & Support
How can I track my order? As soon as your package leaves our facility or a partner warehouse, you will receive an automated email containing your courier tracking information.
What if I receive a damaged part? Please inspect all shipments immediately upon delivery. If a product arrives damaged in transit, contact our support team within 48 hours with photos of the packaging and the damaged part so we can initiate a claim with the courier and arrange a replacement.
Are ECM calibrations and digital files refundable? No. All digital files, custom ECM calibrations, and VIN-locked tuning software are final sale and non-refundable once generated or delivered. Double-check your VIN, vehicle details, and modification list prior to submitting your order.
What is your return policy? Returns are accepted on new, unopened, and uninstalled physical products within 30 days of delivery.
- Items must be in original packaging with all included hardware and documentation.
- Customers are responsible for return shipping costs unless the return stems from a shipping error or defective product.
- Returned items may be subject to a restocking fee of up to 25%.
Contact Us
How do I contact customer support? Our support team is available Monday through Friday, 8:00 AM to 5:00 PM MST.
- Email: sales@gwndiesel.com or support@gwndiesel.com
- Contact Form: Submit an inquiry directly through our Contact Us page. Please include your order number for faster service.
- Phone: is available once logged in to your account.