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Old 06-01-2011, 02:51 PM
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Bad ECM? - P1605

Well I finally broke down and took my truck to a shop to have it diagnosed. I was unable to diagnose it myself and could no longer put up with it not running. I had another thread attempting to find the problem.

My symptoms included an extremely rough start followed by a terrible idle, a huge loss of power, and randomly stalling at idle. While the problems seemed to get better after miles driven they never went away.

The shop told me I had a bad ECM. They said the code they retrieved was caused by a severe internal ecm failure. (P1605)

I found this strange as i have never heard of vehicles still running with a bad ecm. The mechanic told me he checked it multiple times. I do have a very large amount of trust with this mechanic as he is a relative of mine.

I am very interested in what you all have to say. Should i just go ahead and assume they are right and replace it?

Last edited by 02PowerStrokeFord; 06-03-2011 at 01:15 PM.
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Old 06-02-2011, 10:12 AM
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Where are you? Maybe someone on here is close to you and can pull the codes for you, that is what we need to help diagnose your problems? Also what are the numbers on your ECM, it is under the dash beside the emergency brake pedal?
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Old 06-02-2011, 10:49 AM
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What was the actual code?
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Old 06-02-2011, 12:09 PM
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I just realized this is posted in the wrong forum. I have a 2002. I reposted in the correct forum.

I am unsure of the exact code it threw just that it was quoted as "internal pcm failure". I called the mechanic and asked and he said he didn't remember the code and has to charge me to have it scanned again to get it.

My ECM code is 2C3F-DC.
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Old 06-02-2011, 12:10 PM
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And I am in Farmers Branch Tx a couple miles north of Dallas.
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Old 06-03-2011, 11:39 AM
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Are there any members close to this guy that can pull codes for him????
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Old 06-03-2011, 01:11 PM
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I had it rescanned and he told me the code was P1605.
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Old 06-03-2011, 04:44 PM
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I have a 2C3F-DF DPC-462 that I got as a spare to test with, its for a 03 automatic, if you promise to send it back I could send it to you to test with?
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Old 06-03-2011, 08:24 PM
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Quote:
Originally Posted by pablito View Post
I have a 2C3F-DF DPC-462 that I got as a spare to test with, its for a 03 automatic, if you promise to send it back I could send it to you to test with?
Hey that would be perfect. Thank you for the offer. I sent you a PM
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Old 06-04-2011, 02:19 AM
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Your problem almost sounds like a bad IPR. I've had a 1605 code before and that was from a corrupted tune on the computer. I also just fried my computer so trust me if that suckers fried it ain't gonna run. I had to spend 300 to get one shipped out next day but I had another member on here pm me about a pcm for 150. If you end up needing one let me know and I will get you his info.

But just something to try out, unplug your icp sensor and start the truck, see if it will idle and run alright. DONT go full throttle with it unplugged though, around the block will be ok.

Also, check the nut on the back of your ipr, if its loose and the solenoid is moving around it will cause your idle/drivability issues.
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