2004 Ford Mustang Service engine light

JAYYISAMUSTANGMAN

MEMBER
2004 FORD MUSTANG
3.9L
V6
RWD
AUTOMATIC
150,000 MILES

Hi my name is jay and my service engine light just came on and I took it up to auto zone and they said it's reading a code P1233 but they said they don't know to much about it and asked me if my car ever misfired or stopped but I told them no could you tell me what this code mean or what should I do any advice would be most appreciated.

5 Replies

HOMER1967

MECHANIC
875 POSTS

Does the vehicle ever crank over but not start? The code p1233 is referring to a fuel system issue typically the fpdm (fuel pump driver module) which just means the whole fuel pump assembly. But could also be anything from the inertia switch, which dis-able the fuel pump in an accident or collision, to the fuel pump wiring harness. In the majority of cases I've seen this it has been a fuel pump assembly issue. But I can not say for sure if that is the case wth your car.

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Saturday, February 15th, 2014 AT 6:49 PM

JAYYISAMUSTANGMAN

MEMBER
3 POSTS

Thanks homer for responding but No it starts every time I crank it how can I know for sure if it's my fuel pump assembly or inertia switch and also I forgot to mention my theft light blinks when the car is not cranked. Could this also be part of the problem to.

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Saturday, February 15th, 2014 AT 10:18 PM

HOMER1967

MECHANIC
875 POSTS

Your welcome jay, unfortunatly diagnosing your vehicle is going to require several very specific tools, wiring diagrams, and an extensive knowledge of these systems. And I think that the security light is a separate issue.I would suggest that you take it to a professional to have these issues diagnosed.

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Sunday, February 16th, 2014 AT 5:18 AM

JAYYISAMUSTANGMAN

MEMBER
3 POSTS

Ok thanks and could you tell me weres the inertia switch and do you think auto zone can check it out for me or do you think it's best if I just go to the ford dealership because my regular mechanic acts like he dosent have a clue wats wrong with my car. He says I should just get my system reset so the light can turn off but I really don't want to do that if there's really something wrong with it

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Sunday, February 16th, 2014 AT 2:29 PM

HOMER1967

MECHANIC
875 POSTS

There's no need to take it to a ford dealer. Any competent technician should be able to handle this issue, you may want to re-think your regular mechanic. The inertia switch is in the trunk very close to the drivers side rear tail light.