Fuel Injector Failure When it Rains - Dodge Cummins Diesel Forum
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post #1 of 15 (permalink) Old 06-07-2019, 01:19 PM Thread Starter
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Fuel Injector Failure When it Rains

It was raining the other day and the truck is driving on the freeway fine. I took an exit and my check engine light came on and the truck got shaky like it was misfiring(just describing the shake not the cause), and I pulled over into the nearest parking lot. I waited 30 min, cleared the CEL, and everything was fine and drove away.. it had also stopped raining when I left.

The CEL codes were Fuel Injector 2 and 3 Open(two different codes).

I've had some weird rain issues in the past, so I assume there is some sort of connector loose somewhere or exposed and water gets in when it rains because if it's not raining, I NEVER have any issues with the truck and it's always some weird engine error. I think last time it was Cyl 2 and 3 misfire.

Does anyone know somewhere I can start looking to see if there are any exposed connectors that specifically may be causing similar issues when they get wet?

P.S. The first time this happened, I think I was behind a semi(also in the rain) and it was shooting water all over the front end so maybe there's a connector or something behind the grill?

Thanks in advance!

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post #2 of 15 (permalink) Old 06-08-2019, 09:02 PM Thread Starter
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Any ideas?

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post #3 of 15 (permalink) Old 06-08-2019, 10:06 PM
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Start by checking the injector harness.
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post #4 of 15 (permalink) Old 06-09-2019, 05:25 AM
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There is a large body electrical harness on the drivers side. I believe it’s in the are on the drivers side, behind the wheel well plastic near where where the metal wheel arch runs into the quarter panel. I have seen trucks show symptoms like yours when the harness is not completely connected or tight enough to resist water.

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post #5 of 15 (permalink) Old 06-09-2019, 05:37 AM
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I believe if I remember last time I saw it, it’s behind the plastic wheel well liner
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post #6 of 15 (permalink) Old 06-09-2019, 09:13 AM Thread Starter
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Quote:
Originally Posted by K9Kodi View Post
I believe if I remember last time I saw it, itís behind the plastic wheel well liner
Awesome, and that's which harness?

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post #7 of 15 (permalink) Old 06-09-2019, 12:34 PM
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Quote:
Originally Posted by K9Kodi View Post
There is a large body electrical harness on the drivers side. I believe itís in the are on the drivers side, behind the wheel well plastic near where where the metal wheel arch runs into the quarter panel. I have seen trucks show symptoms like yours when the harness is not completely connected or tight enough to resist water.
yeah, isnt that a dumb place for a connection.
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post #8 of 15 (permalink) Old 06-09-2019, 03:14 PM
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Quote:
Originally Posted by jgruberman View Post
Quote:
Originally Posted by K9Kodi View Post
I believe if I remember last time I saw it, it’s behind the plastic wheel well liner
Awesome, and that's which harness?

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I don’t know what harness it is specifically but I do know people in the past have had sporadic issues like you described in wet weather. You can’t miss it. It’s a prettt big connector

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post #9 of 15 (permalink) Old 06-09-2019, 11:49 PM
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The Powertrain Control C1 that runs up to the engine has injector(s) control.



Took a look at the 3 connectors I have behind the driver wheel well.
I'd also read about water splash causing problems for the connectors back there, especially the transmission one.
Lowest one to the ground is the Transmission I-255 connector.
Then above it is I220 Body > Chassis 34 Pin. It has Fuel Pump, Fuel Level, Rear Lights, Locks, Trailer Tow, Park Assist, etc. And I221 Body > Chassis 4 Pin Trailer Tow Park Lamp & 12V


I220 pinout:

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post #10 of 15 (permalink) Old 06-10-2019, 01:22 PM Thread Starter
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Would it help to put some dielectric grease in the connector plug to keep water out?

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post #11 of 15 (permalink) Old 06-10-2019, 02:13 PM
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This happened to me today!

I have been having intermittent drivability issues with the exact description. Mis-fires and skips. Dealer found no issues as of course it worked fine for them.
Today in the rain, it did it again, I drove to the dealer and they were finally able to plug in while it was acting up. NO CEL but it did have stored codes for all but one injector. They tell me there is a bulletin which requires that the injectors be replaced.

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post #12 of 15 (permalink) Old 06-10-2019, 03:40 PM
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Well, I looked at a TSB for 2017.
TSB 09-003-17 for 2017s made from 11-23-2016 thru 3-17-2017 for Fuel Injector metal wiskers.




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