2001 Jeep Cherokee Error codes for misfireing cylinders

Tiny
RC508ABN
  • MEMBER
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 85,000 MILES
I have a 2001 Cherokee. I decided to try Zmax and put in the fuel addative. About 20 miles later the check engine light came on. The garage said that A couple of cylinders were misfiring. He then told me that the zmax brakes up junk in the fuel and lines and it gets clogged in the injectors and that some injector cleaner would take care of it. It did but I havent used zmax since and every couple of months the check engine lights comes on and its the same problem with cylinders misfiring. Replaced the fuel filter and still have the same problem. I cant tell by listening to it and it seems to run smooth. I am howerver not gettin as good of milage as I was before. I am also now gettin a "Evaporative Emission Control System Pressure Sensor Low Input" code that comes up. Wish I had taken auto shop back in school istead of woodshop LOL
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Wednesday, January 23rd, 2008 AT 11:03 AM

9 Replies

Tiny
JACK42
  • MEMBER
Have you tried a fresh set of spark plugs? Tune up? As far as the evap code, I would need the code # to look it up, dont see what you are describing on the list. Is that a Cherokee Classic, Limited, SE, Sport?
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Thursday, January 24th, 2008 AT 7:56 AM
Tiny
RC508ABN
  • MEMBER
The code number was 452 and no I havnt tried a tune up or fresh plugs
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Saturday, January 26th, 2008 AT 9:28 PM
Tiny
JACK42
  • MEMBER
Dont see a code P0452. All the numbers around it are EVAP codes for leaks large and small. Is the gas cap on it, is the cap in good condition?
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Sunday, January 27th, 2008 AT 8:53 AM
Tiny
RC508ABN
  • MEMBER
P0452 Evaporative Emission Control System Pressure Sensor Low Input (I cut and pasted the code from this website-2carpros

Yes, the gas cap is on and in good condition.
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Sunday, January 27th, 2008 AT 1:02 PM
Tiny
JACK42
  • MEMBER
Cherokee Classic, Limited, SE, Sport or Grand Cherokee? Most likely the pressure sensor is bad, need to know the exact production date and model to look up its location
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Monday, January 28th, 2008 AT 7:27 AM
Tiny
RC508ABN
  • MEMBER
2001 Cherokee sport
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Monday, January 28th, 2008 AT 10:19 AM
Tiny
JACK42
  • MEMBER
Still cant find that code or that component on the locator for your year and 1 year either way. Those are generic codes. Where did you get the original code read from?
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Monday, January 28th, 2008 AT 10:55 AM
Tiny
RC508ABN
  • MEMBER
Hypertech power programmer is what I got the code from. Got it a second time this morning whn the engine lite came on. Its getting a tune up right now as we speak. I will see what the mechs have to say on it.
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Monday, January 28th, 2008 AT 12:20 PM
Tiny
JACK42
  • MEMBER
That might not be a manufacturer specific code, generic. See what their scanner says
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Monday, January 28th, 2008 AT 2:56 PM

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