Check engine light
Thread Starter
JK Enthusiast
Joined: Jun 2011
Posts: 214
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From: Westchester County, NY
Check engine light
Did a trip upstate this weekend got into my JK this A.M. & check engine light was on all fluids are ok any ideas hate to go to the dealership if I don't have to!
Thread Starter
JK Enthusiast
Joined: Jun 2011
Posts: 214
Likes: 0
From: Westchester County, NY
Originally Posted by TomOH
Did a trip upstate this weekend got into my JK this A.M. & check engine light was on all fluids are ok any ideas hate to go to the dealership if I don't have to!
JK Junkie
Joined: Apr 2011
Posts: 2,284
Likes: 2
From: Scotchdale AZ
Turn key to on position (but don't start)
push the key into the ignition cylinder and while holding it in, and while holding it in turn to off and back to on 3 times, ending in the on position
If you did it right, all the dash lights will light up and the odometer will be a series of dashes. After the dashes, it will then display any codes (be ready to write them down since you may have more than one).
Once you have the code, that will help out a ton. It could be so many different things to something little like gas cap not on tight to you name it.
Let us know.
push the key into the ignition cylinder and while holding it in, and while holding it in turn to off and back to on 3 times, ending in the on position
If you did it right, all the dash lights will light up and the odometer will be a series of dashes. After the dashes, it will then display any codes (be ready to write them down since you may have more than one).
Once you have the code, that will help out a ton. It could be so many different things to something little like gas cap not on tight to you name it.
Let us know.
JK Newbie
Joined: Dec 2007
Posts: 23
Likes: 0
From: Pine Bush, NY
I have a problem with the check engine light also so I tried what was suggested. It did work and a code came up. Unfortunately, I didn't have a pen with me and I forgot the last 2 numbers. In addition, although I can get the dashes to display, the code won't come up again. Any ideas?
I know the code was P 04 and then I think 96, but I'm not sure about the 96.
Any help will be appreciated.
jvs
I know the code was P 04 and then I think 96, but I'm not sure about the 96.
Any help will be appreciated.
jvs
JK Enthusiast
Joined: Jan 2009
Posts: 199
Likes: 0
From: Elgin, SC
There are only two codes in the p04 series:
p0406-Egr Position Sensor Circuit High
or
p0456-Evap Purge System Small Leak
also the codes should still come up because they havent been cleared from the system, but if it doesnt come back up again then it may have cleared itself...so you may not have the check engine light coming on when you get back in, although sadly that is highly unlikely.
for a complete list of DTC's you can refer to this page:
http://www.quadratec.com/jeep_knowle...rticle-139.htm
p0406-Egr Position Sensor Circuit High
or
p0456-Evap Purge System Small Leak
also the codes should still come up because they havent been cleared from the system, but if it doesnt come back up again then it may have cleared itself...so you may not have the check engine light coming on when you get back in, although sadly that is highly unlikely.
for a complete list of DTC's you can refer to this page:
http://www.quadratec.com/jeep_knowle...rticle-139.htm
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
There are only two codes in the p04 series:
p0406-Egr Position Sensor Circuit High
or
p0456-Evap Purge System Small Leak
also the codes should still come up because they havent been cleared from the system, but if it doesnt come back up again then it may have cleared itself...so you may not have the check engine light coming on when you get back in, although sadly that is highly unlikely.
for a complete list of DTC's you can refer to this page:
http://www.quadratec.com/jeep_knowle...rticle-139.htm
p0406-Egr Position Sensor Circuit High
or
p0456-Evap Purge System Small Leak
also the codes should still come up because they havent been cleared from the system, but if it doesnt come back up again then it may have cleared itself...so you may not have the check engine light coming on when you get back in, although sadly that is highly unlikely.
for a complete list of DTC's you can refer to this page:
http://www.quadratec.com/jeep_knowle...rticle-139.htm
P0401 - Egr System Performance
P0403 - Egr Solenoid Circuit
P0404 - Egr Position Sensor Rationality Open
P0405 - Egr Position Sensor Circuit Low
P0406 - Egr Position Sensor Circuit High
P0420 - Catalyst Efficiency (bank 1)
P0430 - Catalyst Efficiency (bank 2)
P0440 - General Evap System Failure
P0441 - Evap Purge System Performance
P0443 - Evap Purge Solenoid Circuit
P0452 - Evap Pressure Switch Stuck Closed
P0455 - Evap Purge System Large Leak
P0456 - Evap Purge System Small Leak
P0457 - Loose Fuel Cap
P0461 - Fuel Level Sensor 1 Performance
P0462 - Fuel Level Sensor 1 Circuit Low
P0463 - Fuel Level Sensor 1 Circuit High
P0480 - Cooling Fan 1 Control Circuit
P0481 - Cooling Fan 2 Control Circuit
Last edited by ronjenx; Jul 18, 2011 at 06:52 AM.
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JK Enthusiast
Joined: Apr 2009
Posts: 368
Likes: 0
From: Pawcatuck, CT
http://www.obd-codes.com/trouble_codes/
Great site with all (I think) obd codes.
A P0306 code means that the vehicles computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6.
^ from http://www.obd-codes.com/p0306
You can also pull codes by holding the trip odometer stalk while off then turning your Jeep on while still depressing the stalk.
Great site with all (I think) obd codes.
A P0306 code means that the vehicles computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6.
^ from http://www.obd-codes.com/p0306
You can also pull codes by holding the trip odometer stalk while off then turning your Jeep on while still depressing the stalk.
Last edited by zking1776; Jul 18, 2011 at 08:49 AM.