Paccar Mail In Electronic Repair Services
At The ECU Pro, we are your trusted partner for mail-in repair services specializing in PACCAR engine electronics. Our expertise extends to the PCI (Powertrain Control Interface), a critical component responsible for the smooth operation and performance of your PACCAR-powered vehicles. Recognizing the cost of downtime, we’ve tailored our services to prioritize speed, quality, and convenience through our seamless mail-in repair program.
Our experienced technicians handle each PCI repair with precision, utilizing advanced diagnostics and real-world testing on PACCAR trucks to ensure your engine control module is fully repaired before shipping it out. Additionally, our ECU testing service verifies whether your PCI is actually faulty, helping you avoid unnecessary and costly repairs.
When you choose The ECU Pro, you’re selecting a service designed to keep your PACCAR engines running smoothly with minimal disruption to your operations. Let us help you save time, reduce costs, and get your vehicles back on the road faster.

Dedicated Support Team

ECU Repairs Tested In Actual Trucks
Justin Blankenship




Very solid process and service. I like the website, too! I was getting loud clicking from the footwell and that evolved into a no-start condition. I was getting the A0A9 code. I removed the CAS and ... read more
33 minutes ago
4.86 average rating from 5104 reviews

Paccar MX ECU / ECM / MCM Repairs
At The ECU Pro, we provide trusted mail-in repair services for PACCAR Powertrain Control Interface (PCI) modules, ensuring your heavy-duty vehicles perform at their best. Our convenient mail-in program allows you to send in your malfunctioning PCI units for professional repair and testing by our skilled technicians, helping you minimize costly downtime.
Symptoms of a failed MX13 PCI include:
- Communication faults
- Engine intermittently cutting out
- Blowing fuses
- Engine no start
- No communication with ECM
Contact us
Shipping and refunds
In short: Free standard return shipping within the USA is included in all services. Optional express shipping is available at checkout. Shipping your parts to us is your responsibility.
Last updated July 01, 2022
This Shipping & Delivery Policy is part of our Terms of Service ("Terms") and should be therefore read alongside our main Terms: https://the-ecu-pro.com/policy/terms-of-service.
Please carefully review our Shipping & Delivery Policy when purchasing our products. This policy will apply to any order you place with us.
What are the shipping and delivery options
Free Shipping
We offer free Standard 2-3 day shipping on US orders only.
Expedited Shipping Fees
We also offer expedited shipping at the following rates:
US LOCAL FedEx 1-2 days $75
If you select an expedited shipping option, we will follow up after you have placed the order with any additional shipping information.
All times and dates given for delivery of the products are given in good faith but are estimates only.
For EU and UK consumers: This does not affect your statutory rights. Unless specifically noted, estimated delivery times reflect the earliest available delivery, and deliveries will be made within 30 days after the day we accept your order. For more information please refer to our Terms.
Do you deliver internationally?
We offer worldwide shipping for a set fee of $150. Free Standard 2-3 day shipping is not valid on international orders.
Please note, that we may be subject to various rules and restrictions in relation to some international deliveries and you may be subject to additional taxes and duties over which we have no control. If such cases apply, you are responsible for complying with the laws applicable to the country where you live and will be responsible for any such additional costs or taxes.
What happens if my order is delayed?
If delivery is delayed for any reason we will let you know as soon as possible and will advise you of a revised estimated date for delivery.
For EU and UK consumers: This does not affect your statutory rights. For more information please refer to our Terms.
Questions about returns?
If you have questions about returns, please review our Return Policy: https://the-ecu-pro.com/policy/refunds.
How can you contact us about this policy?
If you have any further questions or comments, you may contact us by:
- Email: info@the-ecu-pro.com
Return policy
Last updated January 2020
Thank you for your purchase. We hope you are happy with your purchase. However, if you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund only. Please see below for more information on our return policy.
Returns
All returns must be postmarked within fourteen (14) days of the purchase date. All returned items must be in new and unused condition, with all original tags and labels attached.
Return Process
Step One: Contact info@the-ecu-pro.com for returns.
You must return the items in their original package.
You must include all accessories and user manuals that came in the same package.
Where an item has been purchased as part of a bundle of multiple items, all items within that bundle must be returned.
Please treat the items with care and return them in the condition that they were delivered to you.
Replacement or refund can only be processed once we have received all the items to be returned.
If you return items 1) that you are not entitled to return, 2) that are not in their original condition, 3) that are without proper or missing packaging, 4) with items missing from the return delivery, 5) without following our return instructions, or 6) have otherwise failed to exercise reasonable care when taking care of and returning items, we reserve the right either to reject your return and decline to refund or to deduct from those payments to be refunded to you reasonable repair or other similar direct costs that we have incurred, subject to applicable law.
If your return has been accepted, we will refund you the price you have actually paid for the items less any applicable shipping costs (as per the above) by crediting your payment card thirty (30) calendar days after the date of receipt of the delivery.
Please note that The ECU PRO LLC will only process returns and refunds for items bought in this Online Shop.
Please place the item securely in its original packaging, and mail your return to the following address:
The ECU Pro
Attn: Returns
Order number issued at checkout
181 Hills Creek Road
Wellsboro, PA 16901
United States
Please note that you will be responsible for all return shipping charges. We strongly recommend that you use a trackable method to mail your return.
Refunds
After receiving your return and inspecting the condition of your item, we will process your return. Please allow at least ten (10) days from the receipt of your item to process your return. Refunds may take 1–2 billing cycles to appear on your credit card statement, depending on your credit card company.
Exceptions
The following items cannot be returned:
-
All items related to the testing or repair of products which is deemed a service provided
For defective or damaged products, please contact us at the contact details below to arrange a refund or exchange.
Please Note
-
A 25% restocking fee will be charged for all returns.
-
All returns must contain detailed fault codes of the product in the vehicle.
Questions
If you have any questions concerning our return policy, please contact us at:
(888) 723-2080
info@the-ecu-pro.com
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