Question about 1997 Jeep Grand Cherokee

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Code 12 problem solving on jeep grand cherokee

Trying to fix problem code 12 and code 55 what do they mean...what parts are they....where is the problems located...

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Code 12....The upstream sensor is the one in the manifold. That's the one that controls your fuel mix.

If you've not disconnected the battery for four years the power to the PCM has dropped low enough to trigger the code - possibly during cranking if the battery isn't too good or has a bad connection somewhere. You might need to remove the battery wires and clean up the clamps and terminals to stop it recurring and then try and get the code cleared somewhere or drive lots of short journeys till the code clears.

Posted on Jan 22, 2013

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Posted on Jan 02, 2017

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motor1258
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SOURCE: the check engine light came on and i used the

What problems are you having currently/
12 is battery has been disconnected recently
42 is fuel pump relay circuit
45 is turbo boost, but I suspect your is non-turbo.
46 is usually charging system related.

Posted on Sep 27, 2009

  • 41 Answers

SOURCE: engine code 95 jeep grand cherokee lerado

12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle.  Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.

Posted on Dec 16, 2008

motor1258
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SOURCE: The fault code onmy jeep grand cherokee limited

12 is just telling you that battery has been disconnected or dead recently. No worries.
21 is oxygen sensor, which will likely need replacing.

Posted on Feb 15, 2010

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SOURCE: I'm trying to find out

Code 12 on any Chrysler or Jeep vehicle simply indicates the battery has been disconnected. Most of the time this code is induced when someone has disconnected the battery as a means to clear trouble codes. This code will clear itself after several successful starts

Posted on Sep 27, 2010

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I need help with a code 12 for. 95 grand Cherokee orvis 5.2l. In need of some help. I know what the code says, but don't understand what it means.


A code 12 just means that memory to the controller has been cleared within 50-100 engine starts, which can occur whenever the battery terminals are disconnected, battery completely dies, etc. Nothing to worry about really, and it is NOT related to the thread that you found.
http://www.jeepforum.com/forum/f11/jeep-cherokee-help-error-code-12-a-1172243/

The codes you found indicate there are no stored trouble codes: Code 12 means that the battery or the computer power lead was disconnected sometime during the last 50 operating cycles. This is not an indication of a problem. Code 55 means that there are no other stored codes in the computer.
http://answers.edmunds.com/question-95-5-2L-Jeep-Grand-Cherokee-Ltd-code-12-What-should-I-do-93723.aspx

http://www.bing.com/search?q=error+code+12+jeep+grand+Cherokee&qs=n&form=QBRE&pq=error+code+12+jeep+grand+cherokee&sc=0-33&sp=-1&sk=&cvid=F34E2340514C41A7B7139E3671F6D25D

Jun 12, 2016 | Cars & Trucks

1 Answer

Trouble codes 122355


I assume you mean 12 , 23 , & 55 right? If so the 12 means no ignition reference or battery has been disconnected.. (if vehicle not running during test this is OK) 23 mean there is a problem in the IAT circuit (Intake Air Temperature sensor). Could be faulty sensor or poor connection. 55 means end of code string.

Jul 11, 2013 | 1995 Jeep Grand Cherokee

1 Answer

12 51 55 codigo de error


12 just means the system was reset recently 55 mean end of codes so don't worry about them 2 however code 51 is an oxygen sensor error (O2 Sensor) a bad or shorted O2 sensor can cause it to run very bad and get poor gas mileage.

Nov 10, 2010 | 1994 Jeep Grand Cherokee

1 Answer

I'm trying to find out what the code 12 means for a 1994 Jeep Grand Cherokee Limited?


Code 12 on any Chrysler or Jeep vehicle simply indicates the battery has been disconnected. Most of the time this code is induced when someone has disconnected the battery as a means to clear trouble codes. This code will clear itself after several successful starts

Sep 27, 2010 | 1994 Jeep Grand Cherokee

1 Answer

Jeep Grand Cherokee 1997. Getting check engine light signal 12 14 43 55. Car symptoms are stalling rough idle.


Code 12 = Recently disconnected battery

Code 14 = Coolant sensor high resistance or shorted

Code 43 = Knock sensor or Electronic spark control circuit fault

Code 55 End read code.

Hope helps (remember rated this).

Jun 12, 2010 | 1997 Jeep Cherokee

1 Answer

Engine code


12 and 55. The 55 means end of code session, the 12 means no distributor reference. Both of these codes are normal with the engine not running, so do not go out and purchase a dstributor. Is there another problem with the vehicle, or did you just want to know the codes? Comment back to continue,thanks.

May 26, 2010 | 1995 Jeep Grand Cherokee

1 Answer

94 jeep grand cherokee v8 5.2


12 is usually a power disconnect, 14 is usually a map sensor 56 I'm not sure of...likely you mis-read it and it was a 55, indicating that the code sequence has ended (nothing code)...right after which, codes repeat.

Jun 28, 2009 | 1994 Jeep Grand Cherokee

1 Answer

Engine code 95 jeep grand cherokee lerado


12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle.  Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.

Dec 16, 2008 | 1995 Jeep Grand Cherokee

1 Answer

Rough idle, and rough in the 50 - 65 mph


code 12 is start

13** No difference recognized between the engine MAP reading and the barometric (atmosphereic) pressure reading at start-up

Code 55 is end so 13 is all you need , basically your map isnt working
its an easy fix if thats all , take one off , put new one on

Dec 11, 2008 | 1998 Jeep Cherokee Grand 2WD

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