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Find your diesel ECM

We rebuild, exchange, and program diesel ECMs. Cummins, Cat, Paccar, Volvo/Mack, and Detroit are our core lines; Allison, International, and John Deere by request. Same-day shipping, two-year warranty, out of Princeton, MN.

Buy an ECM

Cummins · Cat · Paccar · Volvo · Tested + warrantied

Programmed to your specs Shop ECMs

Repair My ECM

Diesel ECM repair · $350 bench fee · 3-5 day turn

Diagnostic report included Start a repair

Shop Tools

TimingBuddy · ECM parts · Lab gear

Built by Northland See the tools

Sell a Core

Posted buy list · Cash for cores

Old, dead, or working See our buy list
2-Year WarrantyOn every exchange unit
Same-Day ShipOrder by 2 PM CT
Data PreservationYour tune stays intact
USA ShopPrinceton, MN

How ECM Repair Works at Northland

Here's how a repair goes once it's on our bench.

  1. 1

    You ship it in

    Self-ship free, or add a prepaid UPS label ($45). Drop-offs in Princeton by appointment.

  2. 2

    We test it ($350 bench fee)

    Full diagnostic on the bench. Written report in 1-2 business days.

  3. 3

    Repair or exchange

    If fixable, the $350 credits toward repair. If not, we quote an exchange — usually same-day ship.

  4. 4

    Back to you

    Standard repair 3-5 days on the bench plus 1-3 days return shipping. Rush 24-48hr (+$245).

Start a repair → Read the FAQ

Featured ECMs

View all ECMs →

Shop by engine

Cummins ISX Cummins ISM Cummins ISB Cummins ISC Cummins Celect Cummins Celect Plus Cummins ISX15 Cat C15 Cat 3406E Cat C13 Cat C12 Cat 3126 Cat C7 Detroit DD15 Detroit DD13 Detroit Series 60 Paccar MX-13 / MX-11 Volvo D11 / D13 / D16 Mack MP7 / MP8

Services

ECM Exchange

Every exchange unit gets tested on the bench and programmed to your truck before it ships. Send your core back within 90 days to recover your deposit.

Shop Exchange

ECM Repair

Send us your ECM for diagnosis and repair. $350 bench fee includes the diagnostic report — and credits toward the fix. Most jobs done in 3-5 days.

Request Repair

ECM Cloning & Data Recovery

Save your tune. We can clone your ECM's program to a known-good unit, or recover the flash from a damaged ECM when the chip will still talk. Most cases — not all. Ask first.

Request a quote

Why Northland

We Keep Your Tune

We clone ECMs and preserve what we can of your existing tune through repair or exchange. Tell us up front you want it saved and we'll do our best to keep it intact.

Independent USA Shop

Not a dealer, not a remanufacturer chain. One Minnesota shop with deep bench experience and the freedom to take the oddball jobs the chains won't touch.

In diesel since 2012

ECM-focused as an independent shop since 2018. Cummins, Cat, Paccar, Volvo/Mack, and Detroit are our core lines; International, Allison, and John Deere by request.

Verified Google reviews

What truck owners & shops say

★★★★★
"Mike does great work and sent my repaired ECM back to me right away. Saved me thousands of dollars vs. using the dealer. Would recommend to anyone that needs prompt repair."
Michael B. via Google
★★★★★
"From ECMs and harnesses to straight-out cutting counter bores in-frame for us. Great shop — and a great person to have in your pocket."
Mega24v via Google
★★★★★
"Highly recommend these guys! Fast turnaround — I had my ECM back and repaired by the next day. Will definitely do more business in the near future."
Javon Z. via Google
★★★★★
"Michael is a diesel guru. He made my rig scream and had it done when he said, for the price we agreed to. I'd highly recommend him."
Glenn S. via Google
★★★★★
"Mike is highly knowledgeable in all areas of diesel repair — from mechanical work to advanced electrical diagnostics. You can count on him to get the job done right."
David F. via Google
★★★★★
"Mike is a very professional and skilled mechanic. I highly recommend him for any of your needs."
Justin N. via Google

Read more reviews & leave your own →

Who works on your ECM

I'm Michael — I own Northland ECM and I'm the one in front of every unit that comes through this shop. I came up in diesel out of school in 2012, and in 2018 I went out on my own focused on ECMs because the parts-counter answer ("we'll order you a new one for $4,500 and you'll wait three weeks") wasn't an answer for the truck owners and small fleets I knew. So I learned the units, built the test gear, and started saving people that money. We're small on purpose — every ECM that comes in goes in front of a real expert.

  • In diesel since 2012, ECM-focused since 2018 — Cummins, Cat, Paccar, Volvo/Mack, and Detroit are our core lines; International, Allison, and John Deere by request
  • Tools built in-house — bench testers, programming rigs, our own diagnostic software
  • Independent shop, not a rebuild chain — one owner, one bench, your ECM on it
Send us your ECM See what's in stock

Email us about a problem unit.

It comes straight to our inbox. A diesel tech reads it and answers, usually the same business day. Tell us the engine and what it's doing, and we'll let you know whether we can help.

Email us [email protected]

Send a quick question

Two fields. Goes to our inbox; we reply by email.