20 Most Recent 2008 Jeep Wrangler Rubicon Questions & Answers


Switch is faulty is the first thing comes to my mind. Your spot on tho in your diagnosis, although you may have two pumps and tanks, one for front, one for rear. I would check all my fuses just to be sure, and I would look at all my waster tubes and make sure they are not clogged, check your nozzles too, as sometimes wax can clog them up.

2008 Jeep... | Answered on Apr 21, 2015


New PCM plugs and wires? hun?
new harness ,why? in a fire or wreck? running off road?
or did you mean, new PCM, new spark wires, and all new 02s sensors' It wont be a bad PCM , sorry, 99% are good.
P0132
the PCM never lies. it measure this and does a test and if it fails there is a circuit fault.
the why to understand, DTCs (have a FSM factory serv. manual)
and read how the test works. or do the tests it tells you do to
to discover true cause)
i have this car v6 3.8L: and 6speed and the FSM, book.
verbatim.
O2 SENSOR 1/1 CIRCUIT HIGH
1/1 means bank 1 , front sensor (upsteam)
bank one means right bank, cylinder 1 side.
what does HIGH mean?

what is not clear is which side is failing, heater or CELL
this test is the CELL pin (oxy out)
pin 4.
the test (called a monitor) finds that pin 4 is stuck at 5v.
the o2 must be 0 to 1volt at all times.
if stuck at 5vdc then the ground is open to CELL pin 3 (wire cut)
or the 02 sensors is bad. (open)
do you know how to back probe? a skill that is must for all modern cars. use needles with your meter. (DMM) (leather needles work in a pinch sold at walfart for 1buck) needle probes are 10x better
key on and back probe pin 4, if at 5vdc or more(or near) it's wrong.
btw page 2891 shows what to do in the FSM. yah 7000 pages.
I think this pin floats to 5v if the wire is cut.

fail 2 is that pin 4 is shorted to voltage ,well , the heater runs off
of 12v and all cars (bad service) the 2 wires melt and short.

here ill list all 4 pins (key on)
1- 12v heater.
2- ground
3 - ecu quite ground to 02 (cell minus)
4- CELL + out (this is the oxy signal)

pin 4 must not be at 5v or 12v, but 0 to 1 volts.
at key on or running.


one more FSM quote
Measure the voltage in reference to ground, not the (K902) O2 Return Upstream circuit.

that means pin 3 to 4, is measured for best accuracy
but 5vdc or 12vdc is gross wrong .

if the o2 is new (is)
then this quote covers most fails on most cars
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact
in the Oxygen Sensor and Powertrain Control Module connectors.

here is the wiring.
if you need more photos full size or more tests.
or have questions, ask, i'm a retired ET, (controls systems , PLCs +)





25289545-dxcrgkivymo2usvas4x3llk1-1-0.jpg

see FSM here
on CD (best of best)

https://www.techauthority.com/en-US/Pages/FacetSearchResults.aspx?make=Jeep&year=2008&model=WRANGLER+UNLIMITED+RUBICON+4X4&engine=3.8L+V6+%28SMPI%29&producttype=Service+Manuals&ptCatId=3083

2008 Jeep... | Answered on Nov 23, 2014


with a socket + universal and an extension?
you dont have full tools set?
which engine,? gas or diesel? 3.8L
my 2008 6speed, is yours 5 m.t or slush pump.>? a/t
on mine, its easy.
but cant answer with no engine stated or trans.
or car bodies are same ,for sure. 2door.? right>?

mine is 3.8L v6
i own a full FSM. too.
7400 pages.
the books shows removing battery neg lug, or boom.acid bath

then shield
then says remove starter. see the bolts there?
then as it drops down take of the solenoid wires.
its you hands.
it assumes you have full set of tools.
extensions, universals., and sockets.

but no engine options stated.or transmission.

2008 Jeep... | Answered on Sep 01, 2014


why not say what is wrong or what NSS means.
ok google says, its
neutral safety switch (NSS)
aka, as PRNDL for slush pump tranny (this name make it clear what it fits ,no?)
aka, the clutch switch for sticks.

on my 08 the clutch switchs is on top of the clutch pedal, in plain view.
on a A/T slush pump its on the side of the tranny.

when you move the A/t gear selector the cable
then moves the tranny shift arm.
on said arm on all a/T is the PRNDL.
the PCM/TCM watches this switch at all times.
and sets codes if fails.
the REV part, runs the reverse lights too.


2008 Jeep... | Answered on Aug 01, 2014


Side of transmission at linkages

2008 Jeep... | Answered on Jul 29, 2014


LIGHT INDICATOR AND WIPER ALL PART OF YOU SWITCH ON THE STEERING COLUMN .BUT FIRST READ YOU MANUAL AND CHECK ALL THE FUSES.INSIDE AND OUTSIDE THE JEEP.NEXT FOLLOW THE GROUND WIRE FROM THE BATTERY AND MAKE SURE THE WIRE IS CLEAN AND TIGHT TO THE BODY.MORE GROUND WIRE WILL FIND UNDER THE DASH BOARD CLOSE TO THE DOOR HINCH.
GOOD LUCK

2008 Jeep... | Answered on Mar 28, 2014



reverse is a whole different circuit. via the transmission reverse switch..
my guess is you have burned out lamps.
im looking at alldata.com now. (so can you)
and i will pick the Reverse page, its boy scout simple
battery, fuse 39, wires a switch and 2 lamps.

i bet fuse 39 is blow,
replace, it. some that look good, are in fact not (micro cracks)
or use an ohm meter (dmm set to ohm low)
0 ohms good
infinity bad.

there is a fuse box in engine bay and cab.




2008 Jeep... | Answered on Dec 13, 2013


google search images.


2008 Jeep Wrangler Rubicon diagrams



you will see many different diagrams.

2008 Jeep... | Answered on Feb 07, 2013


A check engine light means the computer found a problem. If the light is steady on, the problem may not be too bad, like a loose gas cap. If the check engine light is blinking, that's a major issue and you need to stop driving and have it fixed or major engine damage could occur.

Jeep Wrangler... | Answered on Sep 21, 2019


Could be an exposed wire in the steering column part of the switch

Jeep Wrangler... | Answered on Jun 29, 2019


Hi, it is on the bell houseing near where the bolts connect bell houseing to engine on the driver passenger side, all the best.

Jeep Wrangler... | Answered on Jun 22, 2019

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