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Old 02-13-2011, 06:28 PM
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06 Ford F350 6.0 KingRanch

Here is all the codes i get.

P0478
P0471
P0299
P0470

Here is the problem. The truck does no have enough power, the RPM's go up to 3,000. But the truck is moving really slow, I drove the truck for about 6 hours, and i got the power back it was getting a lot more then before, now it's the same thing, no power. It only reads up to 23-25psi. Turbo seems to work fine, it's loud like it should be. When i floor it and just goes really slow, and doesn't have that TD BAWR sound. I also cleaned out the EGR, EP sensor. Still the same.
I changed the MAP sensor, still shows the code.

It also starts shaking while going 45mph and 55mph No power just starts shaking>? Any Advice need it fixed. Thanks.
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Old 02-13-2011, 06:46 PM
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Need help!
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Old 02-13-2011, 06:49 PM
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I see you cleaned the EP sensor. Cleaned the tube also?

Found this on another link.

P0470=Exhaust pressure sensor Faulty sensor, open signal return, faulty PCM

P0471=Exhaust pressure sensor range/performance Faulty sensor, restricted supply tube, faulty PCM

P0478=Exhaust pressure control valve high input EP above specified value

All pointing at the tube for EP or PCM

6.0L Diesel
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Old 02-13-2011, 06:58 PM
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I cleaned everything i could almost, i just need to know how to get back my power. which code is causing this.
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Old 02-13-2011, 07:00 PM
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From another thread about EP sensors.

From moebdick:

"Assuming that the EBP (EP) sensor is designed to linearly produce 0-5 volts between 0-54 psi, you should be able to test the sensor by removing it and attaching it to a compressor with a psi guage, then measuring the voltage output with a voltmeter. Each 11 psi increase should result in a 1 volt increase."


Could need a new sensor there.
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Old 02-13-2011, 07:04 PM
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Showed 1 volt
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Old 02-13-2011, 07:09 PM
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1 volt, that means it needs to be changed?
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Old 02-13-2011, 08:55 PM
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Here is a comment by a diesel tech concerning the same issue as yours it looks like.

06 6.0 problems


I had found some testing readings, but it was for a 7.3. Not sure if they would be the same, so I didn't post it.
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Old 02-13-2011, 09:04 PM
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I will try and buy a EP sensor, and see from there.
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Old 02-13-2011, 09:07 PM
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Just read a thread about unplugging the sensor to see how it runs.

I had some EBP sensor problems last year and I was lucky and just needed cleaning.

? on ebp sensor - Ford Truck Enthusiasts Forums
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