6NZ, MBN and early-ACERT BXS 70-pin C15 ECMs are our fastest lane: 2 days on the bench. 120-pin ACERT modules (MXS, NXS, SDP) are repaired too, about a week. Programmed back to your engine serial, 2-year warranty.
The 6NZ is the most-searched Cat ECM there is, and it fails the same three ways over and over.
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) | 2 days |
| MBN | ADEM III, 70-pin | 2 days |
| BXS (early ACERT) | ADEM III, 70-pin (256-1159, 10R-4094) | 2 days |
| MXS, NXS, SDP (ACERT) | ADEM 4, 120-pin (255-5287) | about a week |
Self-ship free, or add a prepaid UPS label. Drop-offs in Princeton, MN by appointment. Include your engine serial number.
$350 bench fee, credited toward the repair. 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. 2 days on the bench.
Programmed to your engine, every channel bench-tested, 2-year 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 the same day.
$745 flat with the bench fee included. The $350 bench-test fee you pay at checkout credits 100% toward the repair. If we cannot repair it we tell you first and offer a tested 6NZ exchange unit with the bench fee credited.
6NZ, MBN and BXS 70-pin units are 2 days on the bench plus 1-3 days return shipping. 120-pin ACERT (MXS, NXS, SDP) about a week.
Yes. We program the repaired ECM to your engine serial before it ships so it plugs in and runs.
Repair at $745 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
Verified Google reviews
"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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