Question about 1998 Jeep Cherokee

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I have a 98 jeep XJ

I have a 98 jeep cherokee sport and i cant erase the codes. i get in the ecm i tried with the scan tool and all i get is error, the i tried resetting the ecm by unplugging the + terminal and grounding it for 30 sec and nothing...the light? still comes on...i did manage to erase just holding the erase button on my scan tool but as soon as i turn the key off then on again it comes up again.... the code was p0700, po100 and p0143...i have fixed all the problems with it replaced the nss and everything works fine except when the light it's on the tranny wont shift into od(or 4th gear) but when the light its off the tranny works just fine i want to erase it so can get my trany to shift into 4th thanks

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  • Jeep Master
  • 20,706 Answers

What country are you in, USA/? we are
what engine is there, ? we have like 2, but more outside USE
must we guess both facts?
so the engine runs great that it, all things ok but the trans fails to shift due to obvious , limphome (limp-in) mode ! that it?
You just want shifting to work, right>?


what is the nss, ( that is not an SAE.org legit term)(VSS???)
(sure tranny bad , VSS swapped, but was not it)
sure.... as is the case most times here. not scanned correctly

first off learn rule one on EFI cars
you can NOT ERASE problems, or you can't erase REALITY.
problems are cured then , you push reset and see if they return
if they DO? THEY ARE REAL and must be corrected.

p-700 means do a full scan of the Tranny TCM to see all errors there
you scan tool is weak. my guess and can not do jeep factory codes
that transmission TCM is in limphome mode.
by light you meant CEL, check engine Lamp that is its name
and comes on for smog fail and other things, (gross errors DRIVE LINE all)
p0700 means (TCM has errors stored, only)
p0100?? that must be a wrong code, written down. says export only.
143 = O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
the oxy sensor B1S3 reads, 0volts all the time, so is bad.
did you replace S3 or the wrong sensor.
on calif 4L it has a split exh, man with 3 sensors, is that your engine? if yes, its the extereme rear o2, (smog only sensor)
S3 is CAT check sensors.

XJ jeeps
we have 2 engines, only in USA< (EPA regs)
2.5L and 4.0L GAS only.
and rule 2, is the transmissions match engines, power. rating!
so there is no one transmission fits all engines.
I owned a 99XJ so know it well.
the export car had a 2.5L diesel , a total different setup end to end.
i have the USA service manual open
there is no p0100 code on any Gas engine , usa.
type or is this DIESEL, post?> why not post engine and fuel first.
that tells me drive line (a/t)

lets change your post
HOW TO GET MY TRANSMISSION (UNSTATED) OUT OF LIMP-IN MODE.?
A: GET IT SERVICED
b: scan it with a real scan tool, not a toy reader.

here are the jeep works on P0700
This SBEC III or JTEC DTC indicates that the EATX or
Aisin controller has an active fault and has illuminated the
MIL via a CCD (EATX) or SCI (Aisin) message. The
specific fault must be acquired from the EATX via CCD or
from the Aisin via ISO-9141.

takes a matching scan tool to scan this box
ISO-9141. is such a tool, spec.
and needs to read P17xx codes (jeeps) too, or you fail.

our 2.5L gas uses the 30RL trans.
the 4.0L gas (petrol) use the AW4 ,tranny "aisin warner box" with TCM brain
what the diesel uses, is not in my book (USA SM)

now my recommendation
drive to any shop
ask for the transmission to be scanned
do not pull your battery cable.
do not push reset. on your cheap or tool old tool.
leave the codes stored in the TCM so the man can scan it
and win.
oddly my jeep book does not explain, oxy sensor 1/3 at all. just that it reads 0v all the time 143 code, odd that.
but no engine or trans stated by you or country

Posted on Mar 29, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

  • 6982 Answers

SOURCE: 1993 jeep grand cherokee..trans wont shift into 4th gear if electrical any help?

By 4th gear, you mean O/D? Did you change the converter? Also, check the brake light switch: the circut there disengages the od...if it's always open od won't work!

Posted on Jan 28, 2009

  • 1 Answer

SOURCE: 1998 Jeep Cherokee Sport Ignition Lights Come on but wont crank

Try putting the car in neutral and starting. If its a manual trans it might be the clutch pedal safety switch or it may be something as simple as a loose battery connection.

Posted on Feb 03, 2009

Clay88
  • 10 Answers

SOURCE: 98 Jeep grand cherokee limited 4.0 auto gearbox shift down

Throttle position sensor

Posted on Nov 20, 2009

ratsack33
  • 91 Answers

SOURCE: I have a 1998 Jeep

both of those codes are related to the shift solenoid on it,more than likely you can feel a difference in the way it shifts, don't keep on driving it like that have a transmission shop test drive it and get a price on the repair,right now they can probably repair it for a decent price, good luck.

Posted on Jan 10, 2011

  • 103 Answers

SOURCE: I have a 2004 jeep grand Cherokee, I have 1st gear

sounds like low transmission fluid, a dirty filter or both, to check the fluid level, open the hood leave the engine running put the transmission in neutral with the parking break on then pull out the dip-stick labled trans, wipe it off with a rag plug it back in then pull it our and look at the level. To see if there is a dirty filter look at the fluid if it is darkbrown or black and it smells burnt then you need to get your transmission flushed and the filter changed.

Posted on Jun 29, 2011

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25499888-tk5pw0guzkbs2wb12fwiwrb2-5-0.jpg

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