Question about 2004 Isuzu Rodeo

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Code number My "check engine light" came on and won't go off. I found it is the P1239 code but can't find out what that is. Can you tell me what it is and if it is safe to drive.,

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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

Posted on Dec 27, 2008


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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?

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.

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I would try another place for the code check. If the check engine light is on there are trouble codes stored in the computer.
It could be a wiring harness problem or any number of electrical components, including injectors.

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I have an 06 Mazda 3 with the 3.2 engine.The engine light keeps coming on and the engine won't idle right after nor while i put gas in it. Any ideas as what could be causing this. My mechanic cant

The engine light is telling you that the cpu has found sensors that are outside the set parameters . Have the fault codes read and replace the faulty units.

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How to reset check engine light?

Go to your local O'Rielly's or Autozone. They will tell you the code and reset it for free. Otherwise take the negative battery cable loose for about 10 min. This will clear the ECM, but you won't know what tripped the light! Best Wishes, TJ

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The warning light with the engine symbol is on. Is this the emission control system and what is the danger of getting stranded? It also seems like my has mileage has jumped.

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1 Answer


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

Car keeps stalling out along with reduced power and check engine

you did not id what year/make/model but it sounds a lot like a typical failure of the MAP

however, depending on your year/make/model the code could also be a sign of an power concern to your PCM, (powertrain control module) aka computer

May 14, 2010 | Cars & Trucks

1 Answer


i have gone on the internet and looked up the code
however there was 3 2 different meanings to this one code
you need to check all oil levels as it is a warning for oil pressure as well as the throttle body
check the transmission motor oil power steering etc
if these are all fine then there is some trouble with the throttle body this is what i would pin it to.
it should be OK to drive home just be very careful keep it slow and try to stick to one speed
if it is the throttle body you will need a new one any way
if you have cruse control use it as it will keep the motor steady
avoid any harsh breaking or execrating as this makes tension KEEP IT STEADY DRIVE SLOW ABD YOU SHOULD BE ABLE TO GET HOME DON'T GO OVER 80KPH SO ABOUT 71MHP.
don't overtake don't apply power and dont use the aircon if you can help it as this all adds presure to the throttle body
if the throttle body breaks it will not damage your motor as i said you need to get it fixed any way so you cna take the chance
the worst that will happen is you will not make it home and your car wont run till a new throttle body is put on
we have a 2005 holden rodeo at work same as isuzu and we have had this problem it was the throttle body it is ine thing that is commen with in these cars
hope this helps
good luck getting home safley

Dec 28, 2008 | 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

2 Answers

Check Engine Light comes on when car is started

it could be a wide number of things, i would suggest going to your nearest auto zone , they will plug into your computer and tell the exact problem for free

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