Malicesin
New Member
Hello!
First off, i'm sorry if I am posting in the wrong area. I have a 2005 Jeep liberty Renegade and it's been a great vehicle until recent. I'm getting P0306 CEL and at a loss on how to proceed. I've done all the scheduled maintenance on this vehicle since ~65,000 miles on the odometer and today she reads 140,000. About 8 months ago, when coming home the check engine light came on solid. I used both the dash trick to read the code and I have a little cheap scanner tool too and it showed P0306. I decided first off let's just push up the next maintenance interval and include plugs and ignition coils since the ones I have are OEM from factory (Note that all parts that I have used on this Jeep are only Mopar and sometimes Napa/gates items). I started with the plugs and replaced with NGK and gaped them according to the emission stick, replaced ignition coils, oil change, PCV, and coolant and radiator (Decided to get new mopar radiator since I did an order anyways and mine had a small leak).
After completion, I reset the CEL with my scan tool and within 2 weeks the light came back on again with P0306. I then tried using exclusively 91 octane as the owner manual states hot environments warrant using 91. After a few more weeks, the CEL would come back and I'd reset it only to have to come back. I then replaced the new installed plugs with newer ones thinking MAYBE something was wrong with them, I also did the same thing for the Ignition coils and returned them and got news ones, still after a few more weeks the light always comes back.
At this point, I knew I had to contact a mechanic as they have more advance diagnostic equipment than I do. I've taken the jeep now to 3 different mechanics INCLUDING the dealership and no one can tell me whats wrong with it. The dealership suggested a new PCM, I don't see how this would fix it and I told them that there is a code specific for a bad PCM. They ended up giving me a receipt with all the tests they did and it states nothing is wrong even though the light is still on. The other 2 were independent mechanics and I paid their diagnostic fee's and they also said they couldn't find whats wrong with it. $250 for dealership diag, $150 diag fee from 1 mechanic and $100 diag fee from the other.
There is no performance lose nor does the engine sound abnormal. No clicking or loud banging that would make valve train a suspected. MPG seems a little worse, like I think I used to average 18 mpg and now get 16 mpg.
I'm not trying to get this fixed for free or anything like that, I just want my baby happy and fixed. If you know of a good mechanic or shop I can take it to, please let me know.
First off, i'm sorry if I am posting in the wrong area. I have a 2005 Jeep liberty Renegade and it's been a great vehicle until recent. I'm getting P0306 CEL and at a loss on how to proceed. I've done all the scheduled maintenance on this vehicle since ~65,000 miles on the odometer and today she reads 140,000. About 8 months ago, when coming home the check engine light came on solid. I used both the dash trick to read the code and I have a little cheap scanner tool too and it showed P0306. I decided first off let's just push up the next maintenance interval and include plugs and ignition coils since the ones I have are OEM from factory (Note that all parts that I have used on this Jeep are only Mopar and sometimes Napa/gates items). I started with the plugs and replaced with NGK and gaped them according to the emission stick, replaced ignition coils, oil change, PCV, and coolant and radiator (Decided to get new mopar radiator since I did an order anyways and mine had a small leak).
After completion, I reset the CEL with my scan tool and within 2 weeks the light came back on again with P0306. I then tried using exclusively 91 octane as the owner manual states hot environments warrant using 91. After a few more weeks, the CEL would come back and I'd reset it only to have to come back. I then replaced the new installed plugs with newer ones thinking MAYBE something was wrong with them, I also did the same thing for the Ignition coils and returned them and got news ones, still after a few more weeks the light always comes back.
At this point, I knew I had to contact a mechanic as they have more advance diagnostic equipment than I do. I've taken the jeep now to 3 different mechanics INCLUDING the dealership and no one can tell me whats wrong with it. The dealership suggested a new PCM, I don't see how this would fix it and I told them that there is a code specific for a bad PCM. They ended up giving me a receipt with all the tests they did and it states nothing is wrong even though the light is still on. The other 2 were independent mechanics and I paid their diagnostic fee's and they also said they couldn't find whats wrong with it. $250 for dealership diag, $150 diag fee from 1 mechanic and $100 diag fee from the other.
There is no performance lose nor does the engine sound abnormal. No clicking or loud banging that would make valve train a suspected. MPG seems a little worse, like I think I used to average 18 mpg and now get 16 mpg.
I'm not trying to get this fixed for free or anything like that, I just want my baby happy and fixed. If you know of a good mechanic or shop I can take it to, please let me know.
