The engine runs fine but nothing will talk to it. Before you buy another module, rule out the adapter, the cable and the data link wiring.
Sale through October 31: $525 on every Cat 70-pin repair (regularly $745). Paid at checkout, full refund if we can't fix it. Failed flash recovery available.
Connect the same adapter and laptop to a known-good Cat engine. If it will not connect there either, the problem is your adapter, driver, or cable.
Confirm the software and adapter combination is supported for that engine. A mismatched driver looks like a dead ECM.
Check the diagnostic connector for power and ground, then the data link wires back to the ECM for corrosion, chafing or a pushed-out pin.
A bad connector or a broken data link wire is cheaper than a module. Rule it out.
Adapter and wiring check out, the engine may even run normally, and the module still will not connect. That points at the ECM itself.
The engine can run like this for a long time, until you need to read codes, change parameters or get past an emissions or update requirement.
Rule of thumb: power, grounds, and harness first, module second. We bench-test every unit, so if the ECM isn't your problem, we'll tell you that too.
Component-level repair, bench test, and your original programming stays with your module. About 3 to 5 days on the bench. You pay the repair price at checkout, before you ship it. Any normal failure we can't fix, you get a full refund. 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.
Not necessarily a new one. Rule out the adapter and data link first. If those are good and the module still will not answer, the ECM can be repaired.
Yes. Your original programming stays with your module through the repair.
About 3 to 5 days on the bench for a Cat 70-pin ECM, plus shipping both ways.
More Cat ECM symptoms: Cat 70-pin ECM problems & symptoms · Cat Won't Start After the Battery Died · Corroded Pins on a Cat ECM Connector · Cat Dead Cylinder With Good Injectors · Cat Throws Many Sensor Codes at Once
Repair pages by engine: 3406E · C15 · C12 · C10 · C16 · C13 · C7 · 3126 · Equipment
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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."
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"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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