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Old 12-25-2009, 07:16 PM
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p1248

What are all the possible causes for trouble code p1248. I read that it is for no boost detected but what causes this - bad turbo, bad connections or what. Any help would be appreciated.
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Old 12-26-2009, 05:37 AM
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P1248
Turbo Boost Pressure Not Detected

Yep bad turbo, blown boot on the turbo/IC plumbing, not sure if a bad map sensor would cause the 1248 or not. I loaned my shop manual out to another member and haven't gotten it back!! So if you read this SEND ME BACK MY MANUAL!!!
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Old 12-26-2009, 05:45 AM
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Found this using Google in 10 sec. looks like I was right on.

P1248 possible fix MAP hose, sensor, EBP sys, intake leaks, turbo

I would pull the EBPS and check the tube for carbon deposits and clean with brake cleaner.

Why don't you tell us what the symptoms are???
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Old 12-26-2009, 07:18 AM
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Truck seems to run fine - keep in mind this truck is new to me so I have very little seat time. Now, when I get up to say 1500 - 2000 rpm and try to stand on it I have nothing. Seems to be running strictly off the motor with no boost. I don't have my gauges yet so no way at this point in telling if I have low boost or none at all. Feels real bad if trying to pull a trailer. Compared to my pickup this truck has no power at all. The hissing is very loud when cold - which it has been but goes away like it should when the truck warms up. I looked over all the boots from the intercooler and didn't see any rips or tears so I guess maybe I have a bad turbo. Keeps throwing the same three codes (p1391, p1393 and p1248) I replaced the GPR with a Ford replacement part and it made no difference. I now have new valve cover gaskets and new glow plugs to install this weekend. I hope that will take care of the first two codes. This is starting to suck!
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Old 12-26-2009, 02:32 PM
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Quote:
Originally Posted by gmaredd View Post
Now, when I get up to say 1500 - 2000 rpm and try to stand on it I have nothing. Seems to be running strictly off the motor with no boost. Feels real bad if trying to pull a trailer. Compared to my pickup this truck has no power at all. !
Sounds like a turbo.
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Old 12-26-2009, 03:28 PM
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Update

Found a wire that has been disconnected from the GPR for what looked to be a long time from the previous owner. Re-connected it in the correct place, cleared the codes and it seems to be much better now and actually can hear the turbo whistle a little. I really believe that with the SES light on the PCM was controlling the fuel and making it so no boost could happen (some sort of limp mode). I also checked the MAP sensor and line from the MAP (which was very clean) and all seems to be much better. Now after sitting overnight in the cold I am sure the p1391 and p1393 codes will come back - these should be corrected with the new valve cover gaskets and glow plugs we will install tomorrow. Man I hope I am making some progress and don't need a new turbo.
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Old 12-26-2009, 07:21 PM
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Good to hear! sounds like someonee was just goofy enough to leave something unplugged!
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