Jeep Cars & Trucks - Recent Questions, Troubleshooting & Support


https://www.obd-codes.com/p013a

https://www.obd-codes.com/p0420

Above are two reasonable descriptions of the codes, how they are possibly caused and possible checks and fixes.

The importance of a thorough visual inspection and ensuring the engine is running at optimum efficiency as part of the code repair process is stressed.
One thing that isn't mentioned is how when the fuel injector spray patterns go bad or they start dribbling the larger fuel droplets don't burn very well and tend to pass into the exhaust unburned, partially burned or still burning. This confuses the heck out of the closed loop system as it tends to see the situation as a lean mixture and not always successfully tries to richen it, meanwhile an excess of unburned fuel, etc.can quickly destroy the CAT.

When investigating a persistent problem it is important to begin at the beginning and ensure what is going into the engine is right and worrying about the other end last.

Jeep Cars &... | Answered 2 days ago


its a jeep..see your dealer because its under warranty

Jeep Cars &... | Answered on Jun 28, 2020


The starter is situatted between the engine and the two transmission cooler lines, so you'll need some extensions to pull it out.

2006 Jeep Grand... | Answered on Jun 28, 2020


IF it is updateable, that can only be done by the dealership. It is unlikely that it is.

You can reset it by disconnecting the battery overnight. Make sure the key is in the ignition when you reconnect, and you will also need the radio code.

https://www.google.com/search?q=update+the+computer+on+jeep+liberty+2004

Jeep Cars &... | Answered on Jun 27, 2020


The key fob will need to be reprogrammed to the vehicle since when the battery was replaced in the key fob, the key was reset. This is why nothing is working with the key fob. After replacing the battery in the key fob remote, you will need to reprogram the remote to the vehicle

Jeep Cars &... | Answered on Jun 26, 2020


I don't know the answer though the door switch is traditionally fitted into the A pillar and due to the amount of moisture that finds a way in there, the switches do tend to become unreliable.

The Japanese often fitted the switches in a more sensible place - on the B pillar.

With a fully computerised vehicle and the brain often needing reliable assurance the doors are closed, ordinary door switches are considered inferior and so in some instances a microswitch is buried in the door catch. there is no reason why the brain should not use this information to switch on the courtesy light in addition. A wiring diagram would provide more information.

The main problem with this latter type of switch - when there is a moderate amount of wear in the door catch and striker, the striker often doesn't enter the catch far enough to operate the switch, which can cause all manner of problems.

Jeep Cars &... | Answered on Jun 19, 2020


Hi, In answer to your question, yes it does.

As you have a 1995 model the OBD2 port it is located in the passenger compartment, under the driver side dashboard.

Jeep Cars &... | Answered on Jun 18, 2020


A simple test is to feel around the carpet in that footwell. See how far up under the dash the carpet is wet. Does it only happen after rain? Do you have a sun roof fitted?
If the carpet is only wet low down on the floor the most likely reason is either a perished or damaged door seal rubber, a faulty sun roof seal or the drain channels for the sun roof are clogged up. Check the footwell in the back as water always flows and settles at the lowest point in the vehicle.
If it is high up and nearest the middle of the dash you issue could be the heater matrix under the dash but as it seems to be only on one side this might not be the issue.
Door seals are a simple case of pull the old one off and push the new one on and they don't cost silly money to buy. Heater matrix issues, unfortunately, usually involve taking the whole dashboard out to get to it.
Hope this helps.

Jeep Cars &... | Answered on Jun 12, 2020


You obviously refer to a noise but vehicles can make a wide variety of noises.

It would be of invaluable help if you could accurately describe the noise, the type, the pitch, is it relative to road speed or engine speed, does it vary through the gears, change pitch or volume on corners and so forth?

Jeep Cars &... | Answered on Jun 11, 2020


Without running any tests, it is pretty much impossible to tell you why it would not start.
What I can tell you is that if the engine turns when you turn the key, the starter is good. Only exception there is if it turns much slower than normal and battery is fully charged.(verified again by testing). The starters only job is to turn the engine. Your ignition and fuel system is what makes it start and run. A thermostat has nothing to do with starting. If the engine temp is normal when running and you have not overheated it is fine.
Shops use a scanner attached to the vehicles computer system in order to begin diagnosis. The vehicle computer stores fault codes. Most larger parts stores will do a basic scan for free. have that done and see if there are any faults stored...that will give you some idea what may actually be going on. One item that won't show up on a scan is your fuel pump. If the vehicle stalls and you cannot hear the pump when you turn the key back on, that should be looked at.
Often when a pump begins to fail, it gets hot and binds. Once cooled down it will resume operation 'till it heats up again.
As i said though...Without testing I'm only giving you test options and a good guess.

1995 Jeep Grand... | Answered on Jun 05, 2020


Replace the crankshaft position sensor and you should be up and running like normal. Verify that there is no power or ground problem to the crankshaft sensor, the Yellow/Black wire should have battery voltage any time the key is on and the main relay is energized.Verify that the Brown/Yellow wire has a good ground. If all is good then replace.


P0335 - Crankshaft Position Sensor A Circuit Malfunction
The crankshaft position sensor (CKP) measures crankshaft location and relays this information to the PCM (Powertrain Control Module). Depending on the vehicle, the PCM uses this crankshaft position information to time the spark properly or on some systems it is only for misfire detection and does not control spark timing. The CKP sensor is stationary and works in harmony with a reluctor ring (or toothed ring) that is attached to the crankshaft. As this reluctor ring passes in front of the CKP sensor, the magnetic field created by the CKP sensor is interrupted and this creates a square wave voltage signal that the PCM interprets as crankshaft position. If the PCM detects that there are no crankshaft pulses or if it sees a problem with the pulses on the output circuit, P0335 will set.

Symptoms:
NOTE: If the crank sensor is used only for misfire detection and NOT spark timing (this varies with the vehicle), the vehicle should start and run with MIL (Malfunction indicator lamp) illumination. Also, some vehicles require several key cycles to illuminate the MIL. If this is the case, there may be no MIL illumination until the problem often enough over time. If the crank sensor is used for BOTH misfire detection and spark timing, the vehicle may or may not start. Symptoms may include:
Vehicle may not start (see above)
Vehicle may run rough or misfire
MIL illumination


A P0335 "check engine light" code could be caused by:
Damaged CKP sensor connector
Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway)
Sensor output open
Sensor output shorted to ground
Sensor output shorted to voltage
Failed crank sensor
Broken timing belt
Failed PCM

Possible Solutions:
Using a scan tool, check if, when engine is running or cranking, that there is an RPM signal.
If there is no RPM reading, then visually inspect the crank sensor and connector for any damage and repair as necessary. If there is no visible damage, and you have access to a scope, you could check the CKP 5 Volt square wave pattern. If you do not, then, obtain a resistance reading of your crank sensor from a repair manual. (There are so many different types of crank sensors that there's no way to put here which resistance reading is correct). Then check the resistance of the CKP sensor by disconnecting the sensor and measuring resistance of the sensor. (It is best to check resistance readings from the PCM connector. This rules out any wiring problems from the start. But it does require some mechanical skill and shouldn't be performed if you\'re not familiar with automobile electrical systems). Is the sensor within resistance specs?
If not, replace the CKP sensor. If so, recheck resistance reading from the PCM connector. Is the reading still okay?
If not, repair open or short in the wiring to the crank sensor and re-check. If the reading is okay, the problem is intermittent or the PCM may be at fault. Try reconnecting and checking for RPM signal again. If there is now an RPM signal, wiggle test the wiring harness to try and induce the fault.

This code is basically identical to P0385. This code P0335 refers to Crankshaft Posistion Sensor "A", whereas P0385 refers to Crankshaft Position Sensor "B". Other crank sensor codes include P0016, P0017, P0018, P0019, P0335, P0336, P0337, P0338, P0339, P0385, P0386, P0387, P0388, and P0389.


Hope helps.

2006 Jeep... | Answered on Jun 02, 2020


I have a 06 Grand. None of the keyless entry's would work. My son had some kind of Bluetooth for his phone plugged into the right power outlet. Unplugged the Bluetooth and all remotes work just fine. Plugged it back in just to verify and none of the remotes work. It must have some type of security built into it prevent to doors from being locked and draining the battery.

2006 Jeep Grand... | Answered on Jun 02, 2020


First make sure that the shifter cable is properly adjusted and not binding up or broken.

Jeep Cars &... | Answered on Jun 01, 2020

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