Slow Shifting, High RPM, & CEL - Ford Powerstroke Diesel Forum
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Old 11-26-2012, 05:48 PM
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Slow Shifting, High RPM, & CEL

Hi everyone,

I'm new to the site and a new diesel owner. I appreciate all the valuable information I have read on this site and hope to continue learning from everyone here.

I have a 2003 F250 XLT 6.0 w/163,000 miles that I have been having a little trouble with lately. A week ago I replaced the oil cooler, deleted the EGR cooler, oil and filter change, internal and external transmission filters and transmission fluid change.

RPM raises to about 3500 before the gear shifts and the last time I was driving it the CEL came on. I took it to O'reilly's and they pulled DTC p0238. I have also noticed a significant loss of fuel mileage.

I apologize for the long thread and would appreciate any response that can help me with these issues.
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Old 11-26-2012, 06:40 PM
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This would help......Write Up: Monitoring the 6.0L PSD.

Sent from my phone that somebody didn't help me get.
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Old 12-05-2012, 10:10 AM
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Originally Posted by southend View Post
This would help......Write Up: Monitoring the 6.0L PSD. - Ford Powerstroke Diesel Forum

Sent from my phone that somebody didn't help me get.
Good read, I'll get some sort of monitoring device installed once I get some $ together. Unfortunately the problem still persists Still trying to figure out what it could be.
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Old 12-05-2012, 11:25 AM
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Check your map sensor hose for a restriction that is connected on the right side of your intake, and goes up to a sensor by your accumulator box.

Sent from my phone that somebody didn't help me get.
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Old 12-05-2012, 11:51 AM
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I have taken it off and blew compressed air through it. It appeared to be unobstructed. I have gotten the P0238 DTC three times now but the CEL turns off on its own after a day or so.
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