The 3406E is the engine we see most. The 70-pin ADEM III module on 2WS engines is our fastest lane: 2 days on the bench, programmed back to your engine serial. 40-pin ADEM II units (5EK, 1LW, 6TS) and the older PEEC 3406B/C modules (4CK, 8TC) are repaired too, about a week.
The 3406E has been on the road since 1994 and its ECMs fail in predictable ways. Almost all of it is repairable.
What you see: A dead hole, a cylinder cutout test that shows one injector doing nothing, or a derate that stays after you swapped the injector.
What's happening: The injector driver stage inside the ECM has failed. On 3406E modules this is the single most common fault.
What we do: We rebuild the driver circuit and bench-fire every injector channel before it ships back.
What you see: The engine may run, but ET (or any J1939/ATA tool) will not connect. You cannot read codes or program it.
What's happening: The data-link side of the module has failed while the engine-control side still works, or the module is dead entirely.
What we do: We restore the data link on the bench so the ECM can be read and programmed again.
What you see: Key on, nothing. No ECM power, no injector pulse, sometimes intermittent after heat or vibration.
What's happening: Internal power supply or ground-path failure, often corrosion or a cracked joint on the connector side of the board.
What we do: We repair the supply and connector-side faults at the component level and load-test the module.
What you see: A string of 5-volt sensor codes at once (throttle, boost, oil pressure) that survives sensor swaps.
What's happening: The regulated 5-volt sensor supply inside the ECM is shorted or sagging.
What we do: We repair the sensor supply regulator and verify every sensor channel 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 |
|---|---|---|
| 2WS | ADEM III, 70-pin (157-3705) | 2 days |
| 1LW, 6TS, 5DS | ADEM II, 40-pin (117-4017, 145-7806) | about a week |
| 5EK (1994-95) | ADEM II, 40-pin | about a week |
| 4CK, 8TC (3406B/C) | PEEC, pre-ADEM (9X8085) | 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, bench fee included. The $350 bench-test fee you pay at checkout credits 100% toward the repair, so the diagnostic costs nothing if we fix it. If it is not repairable we tell you first and offer a tested exchange unit with the bench fee credited.
The 70-pin 2WS module is 2 days on the bench, plus 1-3 days return shipping. 40-pin 1LW, 6TS and 5EK modules and the PEEC 4CK/8TC run about a week.
Yes. Send your engine serial number with the unit and it ships back programmed and bench-tested, ready to plug in.
Usually. A dealer "no communication" or "failed" verdict is where most of our 3406E work starts. Send it in; the bench fee credits to the repair.
Related: Cat 70-pin ECM problems & symptoms · C15 ECM repair · C12 ECM repair · C10 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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