6NZ, MBN and early-ACERT BXS 70-pin C15 ECMs are our fastest lane: 3 to 5 days on the bench. 120-pin ACERT modules (MXS, NXS, SDP) are repaired too, 15 to 30 days. Programmed back to your engine serial, 2-year warranty.
Failed flash recovery available.
On every Cat 70-pin ECM we repair, we upgrade the injector drivers for durability and replace the internal battery.
Sale through October 31: $525 on every Cat 70-pin repair (regularly $745). 40-pin and 120-pin repairs stay $745.
The 6NZ is the most-searched Cat ECM there is, and it fails the same three ways over and over.
What you see: the battery went dead on the truck or machine, or it got jump started, and now it cranks and won't fire, or it won't do anything at all. It ran fine before the battery died. This is the classic ECM failure.
The quick check: turn the key on and watch the dash. The check engine light should come on for a few seconds. If it never lights up, there's a good chance your ECM is not waking up.
What we do: check the ECM fuses and battery cables first. If those are good, send the ECM in. We get it powering up again, test it on the bench, and send it back programmed to your engine.
What you see: One hole down on the cutout test, a miss under load, a derate. You replaced the injector and it is still there.
What's happening: The injector driver inside the ECM has failed. On 6NZ and MBN modules this is the number-one fault.
What we do: We rebuild the driver stage and bench-fire all six channels before it ships.
What you see: The truck runs and drives but no diagnostic tool will talk to the ECM. You cannot read or program it.
What's happening: The J1939/ATA data-link circuit in the module has failed.
What we do: We restore communication on the bench so the module can be read and programmed again.
What you see: Dead ECM after a jump, a battery swap, or welding on the frame. Sometimes intermittent first.
What's happening: Overvoltage took out the internal supply or protection components.
What we do: We repair the supply section at the component level and load-test the module before it goes back.
What you see: MXS/NXS/SDP units with codes that come and go with heat, or a derate nobody can pin to a sensor.
What's happening: Cracked solder joints or a failing regulator in the 120-pin ADEM 4 module.
What we do: We reflow and repair the failed section and thermal-cycle it on the bench.
Don't see your exact symptom? Send it in anyway. We bench-test every unit before we tell you what's going on, and if we fix it the diagnostic cost you nothing.
Give us your engine serial prefix and we know which module you have.
| Arrangement | ECM generation / connector | Our bench |
|---|---|---|
| 6NZ | ADEM III, 70-pin (206-2700, 10R-4090) | 3-5 days |
| MBN | ADEM III, 70-pin | 3-5 days |
| BXS (early ACERT) | ADEM III, 70-pin (256-1159, 10R-4094) | 3-5 days |
| MXS, NXS, SDP (ACERT) | ADEM 4, 120-pin (255-5287) | 15 to 30 days |
Self-ship free, or add a prepaid UPS label. Drop-offs in Princeton, MN by appointment. Include your engine serial number.
70-pin units: you pay the repair price at checkout, and if we can't fix it you get a full refund. 120-pin ACERT (MXS, NXS, SDP) units: $350 bench fee, credited the same way. We tell you exactly what failed, usually within a day of receipt.
Injector driver repair, communication restoration, power-supply and 5-volt sensor supply repair, parameter recovery, whatever it needs. 3 to 5 days on the bench.
Programmed to your engine, every channel bench-tested, lifetime warranty. Status email at receipt, at diagnosis, and at ship.
If yours is beyond repair, or the truck can't wait: remanufactured, bench-tested, programmed to your engine serial, 2-year warranty. Usually ships within 10 business days, often sooner.
On a 70-pin unit, you get a full refund when it is a normal failure we could not fix. We fix the large majority of the 70-pin ECMs that come in. The exceptions are when the ECM itself is the reason: a board that is cracked, burned, or eaten by water and corrosion, a proprietary chip that is no longer made, or damage from an earlier repair attempt. In those cases, and if your ECM tests good with nothing wrong, $150 covers the bench test, the written report and the return shipping, and we refund the rest. You can also put what you paid toward a tested exchange unit.
The 70-pin repair is $525 flat (sale through October 31, regularly $745) with the bench fee included, and 40-pin and 120-pin repairs are $745 flat. On 70-pin units you pay the repair price at checkout, before you ship it. If we can't fix a 70-pin, you get a full refund, unless the board itself is damaged beyond repair, a part is no longer made, or it tests good. Then $150 covers the bench test, the report and return shipping, and we refund the rest. 120-pin ACERT (MXS, NXS, SDP) units start with a $350 bench fee that credits the same way. If we cannot repair it we tell you first and offer a tested 6NZ exchange unit with the bench fee credited.
We fix Cat C15 ECMs every day. 6NZ, MBN and BXS 70-pin units are 3 to 5 days on the bench right now, plus 1-3 days return shipping. 120-pin ACERT (MXS, NXS, SDP) run 15 to 30 days.
Yes. We program the repaired ECM to your engine serial before it ships so it plugs in and runs.
Repair at $525 is almost always the better deal on a working truck, and it keeps your own parameters. If yours is beyond repair, or the truck cannot wait, we stock tested 6NZ and MBN exchange units.
Related: Cat 70-pin ECM problems & symptoms · 3406E ECM repair · C12 ECM repair · C10 ECM repair · C13 ECM repair · C16 ECM repair · C7 ECM repair · 3126 ECM repair
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"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."
"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."
"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."
"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."
"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."
"Mike is a very professional and skilled mechanic. I highly recommend him for any of your needs."
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