20 Most Recent 2003 Jeep Wrangler Questions & Answers

Check the battery or try jumping it. You can also cross starter connections to turn it over(make sure it is in neutral if stick and wheels are chocked). May have burnt up a relay or the starter selonoid.

2003 Jeep... | Answered on Aug 24, 2017

2.4L so did you first idle it to get over heat,220f so it can kickon,
scanning the ECT s,proving it hit too hot,, per SM>??
the key here is what, a real schematic,
and a simple voltmeter
some jeeps also have a modulated fan.(and driver for it)
fuse 4, PDC good. tested?
it goes to fan relay , contacts and then to fan motor circuit breaker
no air pocket on top of engine,making, ECT lie?
i the pcm sees ECT overheat
it puts 12vdc across the fan relay coils
if not the wire there bad,cut or pcm bad.
the PCM pin C2-p17 LG wire goes to relay pin 4
he PCM grounds this pin (using a transistor)
the relay closes, fan turns on.


2003 Jeep... | Answered on Feb 11, 2017

stick shift is not standard
a/t is 90% now and is the standard. sure old skool jargon,.
ive done this for over 50 years.
on modern cars have a hidden well fuel pump power switch.
better only matters in the HIDE word(and safety)
they can steal any car, wenched up to any tilt flat bad.
on distrib cars,id go on a very long job field trips
and pull the distributor rotor'

the ways are
  1. fuel pump sw
  2. spark sw
  3. battery disconnect switch and hood locks.
  4. sure starter kill but I can push start mine and hill gravity start it.

the pump kill wins,,because no flooding and fires,
if you kill spark the bad guys then flood engine, can be horrid flood of raw fuel. dripping from exhaust ports.
pump is
win win.

i have super super hidden switch,magnetic,
no man can find ,short of total car take down;l!!
its a key with magnet inside, and hidden hole in carpet/body,
if only needed for long trips in parking lot
even more hidden, is ok.
just pretend you bad guy and he will find a more easy car.
and give up.
even a lashing led in car scares them.
and an extra hood lock so horns can not be silenced or battery cables jerked.
keep in mind, step 1 of thieves is to break the side window
and pop hood.
key to cure is hood locks real.
one car of mine the A$$, ripped whole dash off car in minutes

2003 Jeep... | Answered on Feb 01, 2017

what does it do.
flare or slip
fail to up or down shift correct
shift to wrong gear say 2 to 4, or 2 to 1.?
are you just cruising when this happens
or only accelerating.
did you scan to the PCM for DTC errors yet?
check fluid levels.
is engine overheating,?

2003 Jeep... | Answered on Jul 05, 2016

which engine? 4.0L? which trans, stick or a/t?
can you show the location of the fuse exactly.
each fuse has number and the schematics show only the F number.
is the fuse in the front PDC box, under hood>?
PDC fuse F9 blows, 30amp fuse???? no lower.

need exact fuse to wax smart, i do not have the oper guide that shows, names.
1: wires to it or to PCM shorted that line.
2:PCM bad.
3: OR SOME THING CONNECTted to PCM is shorted.
finding intermittent can be hard, i use, tools that allow me monitor those lines, an ammeter (clamps on wires) id check for wire damage first.
things that can overload the PCM are:
the Alternator Field source pin,
the ISC motor.
both 0xy sensors the heater can not be shorted.
the speed control servo,
in all cases wires too not shorted.
its not the injectors it has its own fuse f28
all comments usa car and guess 4L
now my wild guess, the 02 wires are melted and touching hot exhaust, seen vast times.



2003 Jeep... | Answered on May 26, 2016

cranks ok> / not stated, and is 100% #1 key fact.
ill guess (daft) it cranks OK.
so check fluid levels(oil tops list )
then fuses.we test them.
then scan it.
all modern cars same. deal.

if it dont crank, "my starter is silent or just clicks)
then that be a horse of a different color.
dead battery ? charge system failure,
starter bad?
PRNDL (p/n switches bad )try cranking in neutral yet
my wrangler is 6 speed stick with a clutch switch
that too, is different.
even green battery lugs,.got those?

will not crank
or cranks perfect but will not start
which is it??????????????????????????/

2003 Jeep... | Answered on Jan 14, 2016

Long shot: Bad master cylinder - Typically the brake pedal will slowly sink to the floor. On early 2000 vintage Chrysler products you need to check brake lines as they have been known to rust (and fail catastrophically)

2003 Jeep... | Answered on Apr 12, 2015

I know i have the same problem, and i also noticed than when i open the Hood the whistle just stops, so i figure out it must be some air cycling in or out osmewhere, I found out my air intake connected to throttle body was misplaced a weird gap was left open allowing air to whistle. u might wanna check there

2003 Jeep... | Answered on Mar 19, 2015

it should be in the fuse box under the dash driver side by the brake pedal

2003 Jeep... | Answered on Mar 16, 2015

what country?
what state ?
what city?

new , used or rebuilt.?
there is no fixed costs in usa, not yet, (cept medicare and not part d)
so you can find any price, google, that , see?
why do you think it's bad this. (can advise,)
looks like this


what box, nV what ?
most jeeps come with choices of 4wd option
the tag on rear of box clearly states what is there.

2003 Jeep... | Answered on Mar 07, 2015

A code P0123 may mean that one or more of the following has happened:
  • TPS not mounted securely
  • TPS circuit short to ground or another wire
  • Faulty TPS
  • Damaged computer (PCM)
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.
A code P0121 may mean that one or more of the following has happened:
  • TPS has intermittent open or short internally
  • Harness is rubbing and causing an open or short in the wiring
  • Bad connection at the TPS
  • Bad PCM (less likely)
  • Water or corrosion in connector or sensor
Possible Solutions 1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.
P0152 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 1)

2003 Jeep... | Answered on Feb 27, 2015

great question, why not use a real scan tool and scan it
the tools is like $10 (ask)
when cold and damp all bad high voltage ignition system fail.
from the tin lizzy 1920s to 2015, (for the same REASON)
but today the scan tool helps you with that.
my guess the car has never been turned up this decade.? like most here?

FAIL EMISSIONS, sure, if the CEL glows running you FAIL.
in every state in USA, you fail; (this is a USA forum)

2003 wrangler with the 2.5L or what engine? 4.0L I-6 (inline 6 banger)
not posting engine and the talking smog is a hopeless to all but
i can wax , physics and laws or Otto Cycle , generic.

the engine will fail smog for many reasons, Ill ;list some.
top fails.
  1. Engine misfires, (50 causes ) top cause bad spark. not ever tuned up. with spark plugs and wires, (P03xx codes)
  2. EVAP , failure, more DTC error codes, scan it.?
  3. Transmission errors (P07xx codes)
  4. Lazy CAT P042x codes.
  5. dead O2 sensors (any) for any reasons.
  6. lots more, but why must i list them if you can just scan it.

post back with facts and we can go as deep down the rabbit hole
and take the red pill (complexity path)

if engine has COPS get new boots,.with spark plugs
if engine has a 4 wire coil pack, get new wires, and dont mix them.
remove 1 by 1. not mixed.
cops are engines with DIS that use, COIL OVER PLUGS>

the boots are cheap the cops not.
so boots we do, (savvy) first.

2003 Jeep... | Answered on Feb 11, 2015

A loose gas cap or bad gas cap can cause this ,or filling gas tank while it running .or it could be a small leak in the evap system

2003 Jeep... | Answered on Jan 12, 2015

Unless this happens in the rain as well, I would not worry about it. Likely in the car wash, far more water is coming in than the normal drain system can handle, therefore causing it to overflow. If you do have a drain obstruction, find the drain hose (small right angle hose on firewall passenger side) and roll it in your fingers to clear it.

2003 Jeep... | Answered on Aug 04, 2014

nice facts, all, but no engine size options stated.
after all it's an ENGINE question.
you dont know whats there, and doing DIY> really?

one fact missing, and is key
does WOT power CATCH up
that is you move right foot fast and it bogs, we get that but what happens after the bog> ? more bog or it catches up.
if it dont catch up;, on hills, maybe fuel pressure low.
at WOT there is no 02 sensors. nor TPS (enrich)
at WOT only you , then engine sucking air like mad the MAF at max voltage and if fuel pressure is low the car has endless bog.

wot, = wide open throttle, use a hill to test, flat is useless .
max fuel is at max HP (max torque + max RPM both same time)

i own an 08 wrangler, 3.8L stick.
i just sold my 02,. with 2.4L I4, it was a bogging engine day one out of factory its a gut less I4. (only tubo can fix it)
2.4 or 4.0 L.
ive own all of them 4 and 6cyl.

2003 Jeep... | Answered on Jul 23, 2014

I don't think it's your fuel pump have you tried changing your plugs or doing a full tune up had someone that had similar problem changed plugs wires and cap and rotor and it runs great now even these newer cars need maintenance. Oh and the cleaners you are putting in your gas are just alcohol same thing that's 10% of your gas don't waste your money many studies have been done and have found them useless.

2003 Jeep... | Answered on Jul 22, 2014

Check stering fluid or pump is going out.maby gear box

2003 Jeep... | Answered on Jun 16, 2014

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