P0231 problems

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Mar 23, 2019 | 03:05 PM

Collision

Thread Starter

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Joined: Feb 2016

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From: Royersford Pennsylvania

P0231 problems

This should be a simple problem but the more I read online the more confused I get. The truck died twice today randomly and then restarted promptly. I ran the codes when I got home (oem enhanced) and it was throwing a code for a knock sensor and p0231 which means a bad fuel pump relay. Where is the relay? Under the hood? Behind the radio? I already replaced the fuel pump and the knock sensor awhile ago, but the p0231 is new. Any help is greatly appreciated about where it's located or if it's even serviceable

Mar 24, 2019 | 06:03 AM

JWA

Fleet Owner

Joined: Aug 2010

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From: Reynoldsburg, Ohio

Am I missing where the year, make & model is listed?

Mar 24, 2019 | 06:47 AM

Collision

Thread Starter

Senior User

Joined: Feb 2016

Posts: 493

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From: Royersford Pennsylvania

Quote:

Originally Posted by JWA

Am I missing where the year, make & model is listed?

My mistake. 2003 f250 crew cab long bed 4x4 5.4 2v

Mar 24, 2019 | 09:01 AM

Collision

Thread Starter

Senior User

Joined: Feb 2016

Posts: 493

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From: Royersford Pennsylvania

i took out the radio and that's the only relay block I found, am I missing something? I know that relay is only for the turn signals and hazards

Mar 24, 2019 | 10:54 AM

alloro

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From: 0,0,1

Quote:

Originally Posted by Collision

p0231 which means a bad fuel pump relay. Where is the relay? Under the hood?

It's built into the central junction box and is considered non-serviceable. However, many have replaced it with a little soldering know-how and skill. A search here should find you many threads on the subject.