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IZUZO AXIOM 2004 CODE P1239 - 2004 Isuzu Axiom

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Posted on Jan 02, 2017

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clifford224
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SOURCE: where is the port to

There is no port to check the fuel pressure on your engine. The way Isuzu has you check it is to disconnect the line a the fuel filter and you jump the terminals at the fuel pump relay (see picture below). You run the pump collecting the fuel that comes out of the line for 15 seconds. You should have at least .38 liters (don't know the conversion to pints or whatever). Now for some bad news. In most cases on your engine with the trouble code of P1239 it is the high pressure fuel pump. You have a secondary gear driven pump located/mounted on the back of the right (passenger side) cylinder head. That is what pumps high pressure to you fuel rail which in turn goes to the fuel injectors. Through my experience on many of these engines this is your problem. Now are you ready for some even better news ? That pump cost around $1,000 at the dealer and if you want a new one that's the only place to get it. I just did one a few weeks ago and did find a used one off of a wreck but it still cost me about $500.00 and it took me 3 weeks to locate one. It can be driven this way but it is hard. I am guess the reduced power light has come on and it is hardly moving. In most cases if you kind of give it a little extra gas it will build up the pressure enough to go out of limp mode but I did not recommend that because it is very unsafe in traffic. Below is a picture of that pump for you. I hate to be the guy to give you the bad news and I hope I am wrong but own a shop and this is a common thing for the 3.5 liter engines in both the Axiom and the Rodeo but they are different pumps so you have to get the one for the Rodeo only. If you have any questions feel free to email me at csautomotivecars@att.net and I can help you the best that I can including giving you an idea where to get a used one if you want. Hope this helps a little and good luck.


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Posted on Sep 17, 2011

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I have a 2004 isuzu axiom. The check engine light, reduced power light, and abs light is on. The code reads p1239. i replaced the fuel pump and fuel pressure switch. It will not go over 25 mph. What could...


wow no engine stated, but the last car made is limited so you win this missing fact.
its a Rodeo , renamed for kicks.
and the last USA isuzu,,, after plant closed in Indiana.

p1239 from a real scan tool
autozone yelled one code over shoulder.a real shop did said thisyour $10 scan tool of fleabay showed only one code and lied?or a real scan tool, name it?
the first rule 1 of scanning is have the right tool, so you can see all codes, all federal codes P0xxx and all factory codes P1 p2. p3. and more......
missing codes is like being blind in one eye or worse.
no symptoms posted, just lights, my guess this is your 2nd anon post, and engine does lack power, but for got to say that. this post.

is the transmission slipping or is trans a manual stick?
1239

ill assume one code and use google to find it.
and usa car seem it is... or Costa Rica. 3.5 L 6VE1 V6 (gasoline)

ok engine nailed down. due to last car, and one engine there.

this code is an ISUZU only code , do not read other cars codes using this code or fail, (rule 2)


in fact P1 means just that, factory extended codes. as are P2,3.
car has a unique fuel pump controller box.
and 2 sensors. even more odd, that, for fuel pressure, not level.

so that means, what?
1: the pressure is wrong, (measure it? yet)
2: the sensor is failing (fibbing) if above passes test.
guess how you tell which. on my scan tool i can read all sensor live data. so this helps vastly

my book on the 3.5L sucks , it skips pressure spec.
i could not tell which sensor is upset, low or high, but low is a good guess. id prove that out first.

Mar 04, 2015 | Isuzu Cars & Trucks

1 Answer

Problem with the condenser of a chevi venture 1999


yes now next problem 2004 isuzu rodeo 3.5l direct injection
p1239 p1246 code

Jun 01, 2014 | 1999 Chevrolet Venture

1 Answer

Where is the port to check fuel pressure on a 2004 isuzu rodeo with a 3.5 litre v6 have a computer code of p1239


There is no port to check the fuel pressure on your engine. The way Isuzu has you check it is to disconnect the line a the fuel filter and you jump the terminals at the fuel pump relay (see picture below). You run the pump collecting the fuel that comes out of the line for 15 seconds. You should have at least .38 liters (don't know the conversion to pints or whatever). Now for some bad news. In most cases on your engine with the trouble code of P1239 it is the high pressure fuel pump. You have a secondary gear driven pump located/mounted on the back of the right (passenger side) cylinder head. That is what pumps high pressure to you fuel rail which in turn goes to the fuel injectors. Through my experience on many of these engines this is your problem. Now are you ready for some even better news ? That pump cost around $1,000 at the dealer and if you want a new one that's the only place to get it. I just did one a few weeks ago and did find a used one off of a wreck but it still cost me about $500.00 and it took me 3 weeks to locate one. It can be driven this way but it is hard. I am guess the reduced power light has come on and it is hardly moving. In most cases if you kind of give it a little extra gas it will build up the pressure enough to go out of limp mode but I did not recommend that because it is very unsafe in traffic. Below is a picture of that pump for you. I hate to be the guy to give you the bad news and I hope I am wrong but own a shop and this is a common thing for the 3.5 liter engines in both the Axiom and the Rodeo but they are different pumps so you have to get the one for the Rodeo only. If you have any questions feel free to email me at csautomotivecars@att.net and I can help you the best that I can including giving you an idea where to get a used one if you want. Hope this helps a little and good luck.


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clifford224_521.jpg

Sep 17, 2011 | Isuzu Rodeo Cars & Trucks

2 Answers

I have a 2004 Isuzu Axiom, my check engine light came on as i was on the interstate with my cruise control on. The cruise control stop working exactly the same time the engine light came on. I took it to...


You may have actually had a faulty MAP that needed replace. Thing is that any time you get a "check engine", the cruise will be disabled. you must clear the code, by either a trouble code diagnostic tool, or disconnect the battery for about five minutes. Codes will clear, and cruise will start working again.

Nov 19, 2010 | 2004 Isuzu Axiom

1 Answer

I AM HAVING A PROBLEM DIAGNOSING DTC CODE P1239 ON MY 2004 ISUZU PASSPORT. IT RUNS FINE FOR A FEW MINUTES< THEN THE CHECK ENGINE LIGHT AND REDUCED POWE RLIGHT COMES ON AND IT WONT GO OVER 30 MPH. IF I...


This would be
High fuel pressure system fault - Pressure high or low
1. check fuel quantity and quality
2. check for restriction
3. Open or short circuit condition
4. check repair resource for diagnostic procedure

May need a new fuel pump

Sep 29, 2010 | 2004 Isuzu Rodeo

1 Answer

Code number P1239


says your fuel pump is the problem.. i looked up the code for you.

Dec 28, 2008 | 2004 Isuzu Rodeo

1 Answer

Code number


This code appears when there is a fuel related issue with the vehicle. This can be fuel pressue cause by a clogged fuel filter of a failing fuel pump. In some cases it can also be a clogged return line or failing fuel pressure regulator. In most vehicles that have a secondary fuel delivery system, the second or high pressure pump has failed and will need to be replaced

Dec 27, 2008 | 2004 Isuzu Rodeo

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