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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-28-2005, 07:30 PM   #1 (permalink)
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code p1275 high to low side open

i get this code (p1275 high to low side open cylinder 5) when i do a buzz test

changed the injector harness still no good, changed the injector still no good.


Any one know what i have to do to fix this.

thank you
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Old 07-28-2005, 07:43 PM   #2 (permalink)
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Re: code p1275 high to low side open

First I would check for chaffing in the main engine harness, at the drivers valve cover. Remember, this code is not necessarily an electrical code, but in this case it sounds like it maybe, as you've changed the injector allready. You might want to swap injector 5 for injector 3, Then you have a known good injector in hole 5, and see if the code follows, if not, OHM out the IDM harness all the way to the injector, swap IDM with a friend's IDM. I've got somewhere a Wiring guide for that harness if you need it PM me.

Also make sure you clear the codes completely, My codes would not comback even after a buzz test until the engine was restarted then shut down. Mine were not electrical issues. I just finished this afternoon diagnosing 1272, through 1277 [img]/ubbthreads/images/graemlins/ooo.gif[/img]
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Old 07-28-2005, 07:43 PM   #3 (permalink)
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Re: code p1275 high to low side open

Check and clean the harness at the valvecover and at the 42pin.
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Old 07-28-2005, 07:48 PM   #4 (permalink)
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Re: code p1275 high to low side open

i can't clear the codes for some reasons the autoenginuity says the computer is busy.

i will get right on cleaning the harness and connectors. could you send me that wiring diagram.

thanks
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Old 07-28-2005, 08:03 PM   #5 (permalink)
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Re: code p1275 high to low side open

With AE sometimes if you do a clear 2 or 3 times it will clear mine It works each time if I try 2 times in a row but it will usually give me a busy error. Also do a "refresh" after you do a clear, as sometimes it will say busy but it will have cleared them. then clear one more time for good measure.

those codes are just going to stay there unless they are cleared. I'll check your profile for an e-mail address, if not pm me.
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Old 07-28-2005, 08:09 PM   #6 (permalink)
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Re: code p1275 high to low side open

thanks but i just found my cd manual so i ahve the diagram

i just check the injector reistance 3.5 ohms under 5 is good

the harness and valve cover gasket also passed .6 or .7 ohms on all

if it wasn't so dark out i could do the idm harness
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Old 07-28-2005, 08:11 PM   #7 (permalink)
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Re: code p1275 high to low side open

When did this issue arrise? any changes made to the truck? or did the CEL just pop on?
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Old 07-28-2005, 08:20 PM   #8 (permalink)
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Re: code p1275 high to low side open

i had a balance fault on injectors 2 & 8 so sutpid me decieded to move them to holes 1 & 3 they now contribute why IDK but they work over there and the 1 & 3 work in 2 & 8.

but then 5 stopped working

do you know which holes it is on the main engine harness to test the resistance.

also where is the idm located
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Old 07-28-2005, 08:22 PM   #9 (permalink)
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Re: code p1275 high to low side open

never mind the where is it, it's in the fender drivers side
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Old 07-30-2005, 10:17 AM   #10 (permalink)
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Re: code p1275 high to low side open

It seems to be the engine harness

ford wants 2K for it what is the international part number
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Old 07-30-2005, 10:24 AM   #11 (permalink)
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Re: code p1275 high to low side open

I believe that is a ford only part, as alot of the harness is designed arround the body, an IH IDM isn't located in the same place as ours, Atleast I hope not.

I would check a junk yard. Or even ebay has had a few for about 10% of ford's price.

On second thought which side of the 42 pin connector do you want? passenger side? that probably has an IH partnumber. but the drivers side of the connector is most likely a ford part. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 07-30-2005, 11:07 AM   #12 (permalink)
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Re: code p1275 high to low side open

thought i wanted the passengers side but i just checked it again and it ohms out ok

(light makes it easy to see colors)

so so i put every thing back to gether and same code

might it be the idm it's self and if so how do i test that with out buy an new one.
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Old 07-30-2005, 12:13 PM   #13 (permalink)
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Re: code p1275 high to low side open

best bet is to borrow someone else's IDM and swap it out. no easy way to test it... If you buy one and it isn't the problem you're stuck with it as there is no returns on electronics unless you and the dealer have some special arrangement.

as much as a pain the the butt as it is, I would still try moving the injector to another hole and make sure the code won't follow it. with the right tools it only takes an hour or so.
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Old 07-31-2005, 04:20 PM   #14 (permalink)
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Re: code p1275 high to low side open

i moved it right on to the bench and put a spare in the hole still was no good
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Old 08-18-2010, 11:52 AM   #15 (permalink)
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Posting to this old thread because I had the exact same problem with my truck. Replaced four non-working injectors on the passenger side (1,3,5 and 7) with serviceable ones I had as spares. Service engine soon light on and off intermittently and the KOER Test producing a DTC P1316 (ignition diag codes and the buzz test throwing a P1275 (#5 high to low side open). Swapped the #5 injector solenoid with new, no result. Checked UVC harness OK, VC harness to IDM wiring OK. Followed the Ford Manual Pinpoint tests to it telling me to replace the IDM. I decided to swap the #5 injector for another spare I had on the shelf rather than spend the high dollars on an IDM. Runs great now no more codes or problems. Turns out that a hydro/mechanical fault with an injector can throw a P1271 through P1278 code..
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Last edited by dvjv; 08-18-2010 at 11:53 AM. Reason: typo
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