DD15 Motor Control Module (ECM) don't pressure wash

I got a Check Engine light this week, my scan gauge said spn 677 fmi 5. Which is open circuit to starter magnetic switch. So I checked around the starter and followed the wire back to the ECM. Did find some wear through the plastic loom, but nothing shorting. Truck started fine, after the third restart the code cleared itself. But I was suspicious.
The next day I got to thinking, as just two days before I had the truck washed at a new place in town and they washed my engine really clean. Which I know they are not supposed to do to these electronic engines. I remember seeing the following picture on the internet before.

So today I pulled the 21 pin connector off the ECM. As I released the clamp some water dripped out. I did see some minor surface corrosion just starting on some of the pins, but nothing serious. So I dried things out with a heat gun and compressed air and cleaned things up. Put it back together and things fired up fine.
So just a friendly reminder to keep high pressure water away from the ECM. That connector also carries the power for the ECM and contains the J1939 data bus connections. If things had of progressed further, either the truck would not start, the ECM may lose power, or the data bus could get really crazy.

 

Good thing I found it early then.
A local guy said his cost $8,000 after water caused the ECM to short out.

 

It's a new place in my town, I think they wanted to make a good impression and hosed it extra well. I'm not blaming them, just after that and remember seeing that photo before made me look there.
The last time I paid to have it done was in September and did it myself since. The corrosion was pretty minor so I know it hadn't been in there too long. Since it's a new place their pressure may have been pretty good.