What do this code means.
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.
SOURCE: Jeep Grand Cherokee Limited P0700 diagnostic problem
P0700 means there is a transmission fault code in the transmission controller. Since the transmission controller doesn't have a light attached, it tells the engine controller to turn the light on using this code. You'll have to access the transmission controller to further diagnose the problem.
SOURCE: my 93 jeep grand cherokee service 4wd switch is
Hey there, The driver info center in the 93 grand cherokee's is notorious for this message. This switch is on the transfer case and its only purpose is to tell that display what 4 wheel drive mode you are in (eg. 2 wheel, 4 wheel high, 4 wheel low, etc.) This can mean the switch bad but is USUALLY cause by a short in the display module itself. This will not affect anything on your Jeep. It is merely for driver information only. This is a very common problem and if you have a 93 in which the display is working at all your are lucky. They are very bad about going completely out over time.
SOURCE: What does the code P1494 means on my 99 jeep grand
LEAK DETECTION PUMP SYSTEMS (P1494, P0442, P0455, P0456),
SOURCE: i have code p0137 coming up on my 2003 jeep grand
P0137 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
Essentially the same as P0136, P0137 refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.
Symptoms: There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.
Causes: A code P0137 may mean that one or more of the following has happened:
* Faulty o2 sensor Exhaust leak near the rear sensor
* Plugged catalyst
* Short to voltage on O2 signal circuit
* High resistance or open on O2 signal circuit
Possible Solutions:
* Replace faulty sensor
* Repair exhaust leak near the rear sensor
* Check for restriction in catalyst and replace as necessary
* Repair short, open, or high resistance on o2 signal circuit
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