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post #1 of 7 Old 02-13-2009, 05:23 AM Thread Starter
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code po1277?

what code is this

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post #2 of 7 Old 02-13-2009, 07:47 AM
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Trouble Codes - Powerstroke Nation hope this helps you out

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post #3 of 7 Old 02-13-2009, 07:48 AM
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P1277 - High to Low Side Open - Cylinder 7 Sounds like an injector circuit failure. Bad UVC harness or pigtail.

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post #4 of 7 Old 02-13-2009, 08:11 AM
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agreed , pull the passenger valve cover off and reconnect the injector harness , youll see where its loose

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post #5 of 7 Old 07-22-2009, 11:15 AM
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I have the same code coming up and the truck is running kinda rough, has a bit of a shake even once it's warmed up.
We are having a heat wave here and it still doesn't run well until it's at normal temp. So I buzz tested the injectors yesterday and got this code.
While the buzz test was running I heard all the injectors fire, does that rule out a stuck or bad injector and pretty much narrow is down to the harness or pigtail?
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post #6 of 7 Old 07-22-2009, 11:16 AM
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Quote:
Originally Posted by J-ROCK View Post
I have the same code coming up and the truck is running kinda rough, has a bit of a shake even once it's warmed up.
We are having a heat wave here and it still doesn't run well until it's at normal temp. So I buzz tested the injectors yesterday and got this code.
While the buzz test was running I heard all the injectors fire, does that rule out a stuck or bad injector and pretty much narrow is down to the harness or pigtail?
pull the passenger valve cover first and look at your short harness under there , more than likely its unplugged

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post #7 of 7 Old 07-22-2009, 11:20 AM
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Not running well until warm tells me it's the injector. Do a contrib/balance test and buzz test with the engine hot and see what codes comes up. Double check the harness, and check the OHM resistance of the injectors. I think the specs are 2.9-3.2 or somewhere in that range....

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