20 Most Recent 2003 Jeep Grand Cherokee Questions & Answers

Here's the link and I'm sure you will get the solution of your problem.
Jeep Grand Cherokee Service Repair Manual 1999 2000 2001 2002 2003 2004

2003 Jeep Grand... | Answered on Aug 06, 2016

Dear sir

I think there is something too much tight the cap of coolant box that's why inside the box pressure build.
Kindly use open air type cap to remove moisture inside

Hope answer the question

2003 Jeep Grand... | Answered on Jul 20, 2016

this is a USA forum, and your car is not HERE! a fact !
we dont have 2003 Cherokees here.
Grands yes, not , non grands.
so your car is our.(kinda near) our Liberty
is it gas or diesel.? even saying engine size wins 10 points.
GAS (petrol) answers (wild guessing on my part)
all ways to lose power, in unstated engine,

bogging or misfiring
ever try fresh spark plugs on this puppy.

2003 Jeep Grand... | Answered on Jun 14, 2016

possibly a broken or cracked vacuum hose that is altering the mixture when stopping
could be a brake booster failure

2003 Jeep Grand... | Answered on May 28, 2016

It could be the crankshaft position sensor, but instead of replacing parts on guesswork have vehicle scanned with diagnostic code reader, it will be cheaper in the long run,
let me know how it goes

2003 Jeep Grand... | Answered on May 19, 2016

You need to consult the dealer for special testing. There may be a Technical Service letter on this problem.

2003 Jeep Grand... | Answered on Apr 08, 2016

Likely a bare spot in the wiring somewhere. Not always easy to find. You can try visually inspecting as much of it as you can. There are any number of short finder tools you can buy to help find it. Plenty of videos on youtube showing you how to use them.

2003 Jeep Grand... | Answered on Mar 27, 2016

It's the transfer case position switch. Try unplugging it, if the code clears then replace the switch.

2003 Jeep Grand... | Answered on Feb 13, 2016

Bad grounds. Ground point is on the drivers side, near the rear lights, mounted to the frame.

2003 Jeep Grand... | Answered on Jan 01, 2016

Could be connected, but could also be two different problems.
It could be something in the key switch, or a wiring problem. Or it could be a wiring problem with the temp gauge and something else causing the engine not to start.
Do you have spark and fuel pressure at the injectors ? And does the gas gauge work ?

2003 Jeep Grand... | Answered on Nov 13, 2015

all windows dead? not just drivers? (not stated)
all park lamps dead, all 9 outside lamps dead??????? 3 rear
2 front and sides.? dead, with HL switch to park position?

correct step 1 are fuses
step 2 scan it, the BCM will tell you why it can do its job.
it will.. in most cases.

there are 2 ways (and more) to check fuses.
1: test them all, works every time and takes no knowledge of system complexity. (using ohm meter or voltmeter)
2: read he operator guide and read fuse page. its there. lost that.?
3: read the FSM book or at alldata.com and it there. for sure.

can i assume all else works?, and drive car at night)???????
03 WJ jeep, it is , I have WK 10

so windows can go down so cant test up. on all doors.
Tail lamps. 03.
so front parking lamp work but not rear tail nor rear license plate lamps? that it? the parking lamps is the better name
other wise the front tail lamps out sounds funny.
JB box Fuse 6 runs all park lamps front rear sides and license
so did you miss those lamps?
the relay that runs the run all lamps. all park lamps. lots.
the BCM controls (computer body) controls that relay.
so if main battery is weak the BCM will go nuts. does car drive ok at night
headlights bright?
there is no common demoninator for park and windows.
besides the BCM. it controls 31 major things in the body.
ill check that next. but not windows.
window motors
fuse 12 runs this. PDC fuse box under hood. 50 amps (huge)

ok there is a link from dead parks to windows
that is because the BCM sees you operate the switches
then sends serial commands on the CAN/PCI buss to the door window controllers.
so if you had scanned the pcm , and say gross can buss errors.
then bingo
why not get the car scanned first and show DTC error you have

do the 31 other things work like wipers.
door locks dead.

drive to any shop and say scan my car and get all DTC errors , not just 1 of many.

2003 Jeep Grand... | Answered on Nov 07, 2015

The gauge is showing your temperature not coolant level. Open the hood and remove the coolant cap and top up. Burp the systems by squeezing the hoses. Top up again and replace the radiator cap. Now remove the cap on the water reservoir and fill that to the line. Use antifreeze not water.

Or take it to a garage.

2003 Jeep Grand... | Answered on Oct 09, 2015

it is not necessary to re-program the PCM after injector replacement.

2003 Jeep Grand... | Answered on Sep 10, 2015


2003 Jeep Grand... | Answered on Aug 30, 2015

wonder if the rotors are too slim. If this happens the brakes get too hot as the rotor radiates away the heat. If too hot the brakes could wear out faster.

2003 Jeep Grand... | Answered on Aug 21, 2015

ABS light is the Anti-lock Brakes. the most common cause for the light is wheel speed sensor. These are fairly inexpensive and easy to change, but the only way to know what the error is, is to have the computer scanned by a tool that is able to talk to the ABS module. This will tell you what the issue is, and if it is just a speed sensor...it will tell you which one.

2003 Jeep Grand... | Answered on Aug 19, 2015

relay, way assume there is one?
did you SCAN it yet ? got PCI comm errors. or door module errors?
why not post symptoms and ask for help.
that works not guessing... in 99% of all cases.

WJ jeep covers all this in the FSM book, or at alldata.com
ending the guessing game. fast.
chapter 8 is wiring in the jeep book.
next is power window . 8N- page 33 is there. theory of ops.

are all windows dead, or just one, must I ask>?
FSM chapter 8w-60 -2 shows,

it has 2 modules
the driver module DDM and passenger module, fuses and motors.
now the bad news.
the BCM brain, sees what buttons you press, then the BCM
sends a digital message stream to the MODULES
the modules then do as they are told. via the PCI network.

(that is how it all works with min words)
so what does the shop do.
well he scans first. (after checking all fuse)
PDC fuse 12 , 50 amps. (first if all windows are dead)

now on page 4 they show RHD and export models with no brain
that is , just door switches that go to motor direct, and again
not one relay, in this system..
BCM top left
PCI bus below it.
driver door module getting commands. (serial)
look ma' no switches or relays. (usa cars)

24778773-ylqjikjamog5a0is5ho2uz3h-1-0.jpg what is inside the module is a jeep secret.

the BCM does the magic where by you command driver window down and it does so automatically. this is software doing that in the BCM. a big clue if your jeep has this BCM system. show above.

ill now quote the FSM book
The most reliable, efficient, and accurate means to
diagnose the power window system requires the use
of a DRB scan tool and the proper Diagnostic Procedures
manual. The DRB scan tool can provide confirmation
that the PCI data bus is functional, that all
of the electronic modules are sending and receiving
the proper messages on the PCI data bus
, and that
the power window motors are being sent the proper
hard wired outputs by the door modules for them to
perform their power window system functions.

if you dont have this option DDM ?
then the fuse is blown
or the switches are bad, super easy to diagnose, ask. how.

2003 Jeep Grand... | Answered on Jul 22, 2015

nice anon double post.
so there is no camshaft sensor light on,! (typo?)
why not post a photo of that so we can all laugh.
my guess is its a typo, you meant my check engine light is on.
that? RUNNING? and does it run, ok, (other shoe drops)

yes, that means to scan the pCM
the CAT is bad if the PCM tells you its bad. (p042x) means its bad.
(the smog station will fail it for that. or CEL on running)

or if the engine wont start and CAT melted closed, and the back pressure to it is over 2psi. (easy test)
or the vacuum test fails, cranking or idling if it starts at all.
if the vacuum is near zero cranking ,ONE cause is melted cat.
easy tests all, but is guessing....(BAD THAT)
why not post The full symptoms, not just easter egg hunts...and such.
AND NOT post anon, so we can see you do many posts and form full ideas of all problems posted, (continuity of facts)

WJ 03 jeep
what light , again, here is your cluster, what lamp again?????
that lamp is CEL, not Cam. (apples and oranges diffr)
(aka, MIL & SES) See icon is engine shaped?

24779117-3nbgxbjf1gfdcgdbrzqtqovq-5-0.jpg or did you scan the PCM (good idea for sure)
did you get P03xx errors (called DTC's) and the book says
please say what object showed you CAM?
we cant guess that. say it please.....

2003 Jeep Grand... | Answered on Jul 03, 2015

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