2015 Grand Cherokee 3.6L V6 gas My jeep has had a shake/shutter at low RPM idle for the past few months, and continuously has the check engine light pop on for code P0304 cylinder 4 misfire. It shutters irregularly (not a consistent beat) only at idle, especially when the engine is warmed up and at a lower RPM between 600-700.

The check engine light on the dash of the 91 to 96 Jeep Cherokees displays ECU codes, which can be accessed by looking at the light. On and off the key repeatedly, but never starting the Jeep. Take a moment to count the flashes and note the pause between them. A 12 is usually used as the first code.

You may need assistance from the mechanic to remove the catalytic converter, which can charge you around $75-$100 for an hour of service. 6. Replace Catalytic Converter. Finally; the faulty catalytic converter is the worst-case scenario and most common cause for the P0420 code on a Jeep.

1993, 1994, 1995 Jeep Grand Cherokee 60 Pin Connector (4.0L) The fuel injection computer (known in tech speak as the PCM = Powertrain Control Module) is located on the firewall (passenger side) of your Jeep Grand Cherokee. The PCM has a 60 pin connector and on the back side of the connector (wire side) are embossed a few numbers to further aid

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^{ResumeSpeed. Insert and turn the ignition key from "Off" to "On" three times, moderately fast and without pausing ("ON" is when the digital odometer is displayed). At the third "On" the odometer display will read "DTC REPORT" and list the codes. If no codes are present the message "Done" will appear.} . 77 84 640 770 685 138 46 799

jeep grand cherokee codes list