P0300, P0301, P0306 codes. I own a 2002 Jeep Grand Cherokee Laredo 4.0. The past two years I have been dealing with these same codes, I have done a complete tune up, fuel system clean out, and fuel pump. I took my Jeep to a mechanic to get the fuel system cleaned out and he stated that if that did not work then I would have to replace my fuel 2014 JKR Granite Crystal, 5.13 Auto: RK X Factor 2.5 Inch Lift, Artec Front and Rear Truss, Artec Rear LCA Mounts/Skids, Poison Spyder HD Crossmember, Rock Hard Gas/TC/Evap/Oil Skids, Rough Country Diff Sliders, Nitto Trail Grapplers 37x12.5x17, Pro Comp 97 Series Wheels, Synergy Weld On Rear Trackbar Bracket, PSC Hydroassist, T6 Aluminum Tie Rod, G2 Gold Chromoly Axle Shaft/RCV front axle JEEP CHEROKEE CODE P0300 ENGINE LIGHT ON 2014 2015 2016 2017 2018 2019 2020If you have Jeep Cherokee and you have Code P0300 and your engine light is on we w A P0300 Jeep diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 Jeep code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 Jeep doesn’t tell you specifically which cylinder (s) is/are mis My wife's 2006 throws the P0300 code occasionally in winter. While warming up. Jeep Grand Cherokee & Commander Forums. WK Grand Cherokee & XK Commander Forum . 2775 posts · Joined 2011. #3 · Jan 30, 2014. P0700 is just the code the TCM sends to the PCM to turn on the engine light . You need a code reader capable of reading the TCM . Superchips and other tuners will do it if you have . 5 and counting :05 WK 5.7 HEMI , 90 YJ Islander 4.2L , 94 ZJ Ltd 5.2 , 2000 WJ 4.0 , 2010 MK Patriot. T. Jeep Grand Cherokee & Commander Forums. WK Grand Cherokee & XK Commander Forum P0300, P0315, P0335 codes - misfire issue Went for a drive and the P0300 code came 13. Going out on a limb here but on the Liberty's and on the Liberty forums, the 3.7 V6 has a problem of breaking valve springs, weak valve springs, etc. on valve springs. One of your Intake valve springs could be broken or worn so bad that the Intake valve isn't closing properly and could be throwing the miss fire code. Of course that's a big if. For instance, repair steps for a P0129 code on a Jeep Grand Cherokee may not work for a code P0129 on a Chrysler Pacifica. There is no one fix for a P0129 code. BARO and MAP sensor designs may vary significantly per vehicle manufacturer. Short fuel trim is the immediate response of the ECM/PCM to rich and lean conditions reported by the O2 sensor. A Closer Look at Fuel Trim. Fuel trim isn’t something that can be read with an oscilloscope or meter – it must be reported to a scan tool by way of the datastream.

jeep grand cherokee code p0300