Jeep Grand Cherokee - Recent Questions, Troubleshooting & Support


Jeep Grand... | Answered 6 hours ago

These conditions MUST be ruled out entirely.
Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector.

Unfortunatly, a scan tool will be required to monitor o2 sensor voltages while the engine is running in closed loop. This code you are displaying is NOT an easy solution to trace down. I expect you had an exhaust leak and is why the cats were replaced? Anyway, if so, the PCM can reset the light after a few GOOD trip readings occur that will satisfy the PCM's no fault signal, otherwise the JEEP dealer is going to be your only solution and a pressure test should be performed.

1994 Jeep Grand... | Answered on Oct 13, 2019

when you check fuses you must use a continuity tester or a volt meter to verify they are indeed not blown also clean the contacts in the sockets and your turn signal switch may be finished and needs replacement your vehicle is now 17-18 years old by manufacturer date sticker so things fail after almost 20 years there could also be a broken wire on that socket but verify fuses so you can eliminate that cause sometimes they look good but are blown out in the corner at the top ok

Jeep Grand... | Answered on Oct 10, 2019

I suggtes check in the Service Manual, in this link... Secc-7-Cooling-System


If the hoses are news, then its possible that your problem may be in the metallic coupling (lower radiator).

Tell us news.

1997 Jeep Grand... | Answered on Oct 06, 2019

This could be a loose fuse or a bad connector or the fan switch bad wire also but check this out if it's a lever or twist knob switch see if it has looseness in it does the lever move side to side or its not locking in position EX. LOW-MED-HIGH if so then when your hitting bumps the contacts in that switch disconnect and the fan stops working the air bag warning light is on the same circuit probably so there's a loss off either power or the ground and that makes the light come on next there is also a blower motor control module resistor that controls the heater/ac fan under the hood at the fan motor case check that connector and wires try wiggling it and see if you hear the fan stop these are a common problem for 3 reasons (1) mechanics trying to axcess the area can put pressure on this unit trying to get there arms in deep causing the plug to break or a solder joint to break on the circuit board inside it (2) this also can happen from pulling on it to unplug it or reconnecting it to much force on it (3) a wire on it was punctured to test or get power and not sealed causing corrosion to eat part of the wire so intermittent voltage is getting through and as the wire heats up it can't arc and the power break open circuit happens if you can take out the blower motor resistor and if it's abe to be taken apart (release tabs) only don't try to open a completely sealed unit water will get in it and more problems will come anyway if you can open it inspect the circuit board for solder joint breaks where the connector pins are on the board this is a very common problem and a quick resoldering will fix it but also check the whole board a bad soldering joint will show a circle on it in a ripple kind of appearance or just not enough solder on the pins on the connector part or a resistor capacitor inside okay so if you can check it out inside also if the plug connector looks burnt on the face that plugs into the module then there is definitely a problem there with the module or the inside of the plug is broken and wire separation from each other is lost causing wires that shouldn't make contact with each other to arc grounding out but this would most likely blow a fuse but is possible if only a tiny bit of contact happens so what I've explained to you here is definitely your problem you have to investigate and go through the process of eliminating possible causes okay but I would lean more towards the blower motor resistor/plug or a loose fuse in the fuse box obviously I'm not there to check myself and if your truck was worked on recently and this started go to that resistor ok and so you know where this info is coming from I'm a taxi mechanic in nyc.with 50 + years of experience and I've seen a ton of blower motor resistors that have broken solder/plugs causing this problem on/off/on/off from bumpy streets good luck stephen

2014 Jeep Grand... | Answered on Sep 29, 2019

Wheel sensors are usually for ABS and traction control systems. Speedo is usually connected to transmission

2001 Jeep Grand... | Answered on Sep 27, 2019

Check the wires that run through the door pillar they do break in time as door opened repeatedly .

2001 Jeep Grand... | Answered on Sep 21, 2019

Does the vehicle stall? Is this code intermittent (goes away)?
If so, a cheap test, possible fix is the MAP sensor. To be sure, look at the freeze frame data and look at the manifold pressure itself. If manifold pressure suddenly jumps to near atmospheric pressure (i.e. zero vacuum while under part throttle load) replace the sensor.

Jeep Grand... | Answered on Sep 17, 2019

2003 jeep GC, or WJ jeep, it is..?
there are no 50a fuses in any JB,
there are just 4 in the PDC. engine bay.
so, JB is wrong, input to me.
ill assume F15 is correct, and not F3/7/12 in PDC
F15 feeds JB via a pink wire. (pk-wt)
this main F15 feed JB , F5,7,8,9 fuse in cab.

so pull fuse 5 to 9 there and the one that ends the drain
is the load that is leaking, (phantom drains)
easy, huh, just 4 fuse to pull.
Cab box, only. called JB on all jeeps.
jb fuse 5 is radio.
jb fuse 7 is HVAC zone control (heat?) skim mod. & auto head lamp sensor & BCM memory, (yes lots)
jb fuse 8 is (12 courtesy lamps , intrusion module(export) and VICS, vehicle info center(memory)
jb fuse 9, front12vdc power outlets (cig ports modern) Cell Phone arked there?

or login at and see all that, in the wiring pages.

2003 Jeep Grand... | Answered on Sep 16, 2019

If the line is bad, pull bad one and go to local parts store and get needed length. Actually, whenever I've had to go that deep, I replace all vacuum lines as they tend to get brittle and crack with age. Replacing all avoids failure down the line. And bulk vacuum line doesn't cost that much. You might consider replacing that T as well.

Jeep Grand... | Answered on Sep 16, 2019

it can cause it to run rich because the oxygen sensor may be getting a false reading as to how much oxygen is there....this in turn causes the pcm to add more fuel

1993 Jeep Grand... | Answered on Sep 12, 2019

Check the battery, it sounds like it's flat. Try charging the battery to see if it recovers, but if the battery is about 3 years old or more it is likely to have failed and replacement is the only viable solution.

1996 Jeep Grand... | Answered on Aug 19, 2019

possible that the ball size is wrong for the tow hitches
they do come in two sizes and there is just enough difference to allow movement at the ball

Jeep Grand... | Answered on Aug 14, 2019

How old is the battery? Older ones can get weaker over the years when they are under strain. Especially on a big V8. Go to a battery specialist and they can test it 'under load' to see if it's strong enough.
When you turn the key does it catch, miss and die or does it just wind? Does it idle roughly once started? Please use the 'Comment' button below with the answers if you can
Try putting a dose of good quality injector cleaner through it. Put the cleaner in and just let the vehicle idle for 10 minutes. That way you get a stronger cleaning mixture going through the injectors.

1995 Jeep Grand... | Answered on Aug 11, 2019

When it don't want to start have a friend hit the gas tank while you try to start it, if it starts then it's your fuel pump

2005 Jeep Grand... | Answered on Jul 14, 2019

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