Check engine light?

[Jturs]

So yesterday started up my wife's Jeep and after about a 5 min drive check engine light came on. She has 60k miles completely stock. I drove it this morning and it seems to drive and run fine. I checked gas cap and it's tight.

I went to pull coded with my Aldaobd reader I use on my Ram and it shows no codes present. I tried a different app with my alpha obd mx+ and shows no codes. I used to be technician 10 years ago I know times have changed but I've never seen a check engine light without at least a stored code.

Any help or recommendations.

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[Canucklesammich]

Only help I can give is that I was watching a Rainman Ray vid & the cust's car was intermittently & very briefly losing power. You could see the CEL flashing in the video when it happened, but he also got no codes. His guess was that it happened so briefly that the computer didn't have enough time to register it as a legit problem. Hope this helps.

 

[GATORB8]

Only help I can give is that I was watching a Rainman Ray vid & the cust's car was intermittently & very briefly losing power. You could see the CEL flashing in the video when it happened, but he also got no codes. His guess was that it happened so briefly that the computer didn't have enough time to register it as a legit problem. Hope this helps.

That sounds like a misfire, may not throw the code until it hits a threshold. A good scanner can track misfire counts by cylinder and give a heads up on which one.

 

[GATORB8]

So yesterday started up my wife's Jeep and after about a 5 min drive check engine light came on. She has 60k miles completely stock. I drove it this morning and it seems to drive and run fine. I checked gas cap and it's tight.

I went to pull coded with my Aldaobd reader I use on my Ram and it shows no codes present. I tried a different app with my alpha obd mx+ and shows no codes. I used to be technician 10 years ago I know times have changed but I've never seen a check engine light without at least a stored code.

Any help or recommendations.

Will Alpha show pending codes? Maybe reset the codes and see if it goes off and let it throw the code again.

 

[Jturs]

Im not sure if it will show pending codes on Jeep, I would think so I know on my ram it does. I did the old fashion battery disconnect for about 30 min and code is gone I will see if it comes back.

In mean time I will be replacing the plugs, filters, front/rear diff fluid, t case and maybe the Trans but I can't get a solid answer on how to service this Trans. It's a 2018 and about 65,000 miles. Be bought it used at 40k so I don't know previous service history but it appeared to be very well taken care of.

 

[Jturs]

Will Alpha show pending codes? Maybe reset the codes and see if it goes off and let it throw the code again.

Hopefully if it is a misfire plugs will solve the issue.

 

[GATORB8]

Hopefully if it is a misfire plugs will solve the issue.

I was specifically replying to his post that mentioned a flashing CEL.

 

[Jturs]

I was specifically replying to his post that mentioned a flashing CEL.

It's not flashing just steady.

 

[jjvincent]

To start with, you should get the security gateway bypass, then go back in and use something like JScan. I bought the one from ZAutomotive and thus I can now use my phone to scan all of the modules in the Jeep. In a nutshell, the security gateway module is a money shakedown box to force non dealers to pay $50/year just to access non-OBDII stuff (i.e. every module on the vehicle). We have it at work but we need it for everything FCA for 2019 onward (plus most of 2018 which includes the JL but not JK).

So, you'll be able to see what is actually going on if you bypass that security gateway. For example, my Jeep had a low voltage DTC (from the ESS) and thus threw a generic code that matched nothing I could find. The check engine light was on for two ignition cycles yet the DTC was there no matter what. Plus, other modules can throw the check engine light (i.e. Transmission, ABS etc..) that has nothing to do with OBDII. With that security gateway, you'll never see a code, yet the light can still be on (only DTC you might find is one that triggers the check engine light).

Biggest PIA was it reset the readiness monitors, thus my Jeep would not pass emissions. As of now, my Jeep has been the running joke of the shop because it took two tanks of gas and a few hundred miles of driving to get it to pass emissions. Literally it's like 1996 all over again where cars took forever to reset them. This is 2022 and pretty much everything but FCA, is not that hard to do.

Also, all of the things like disconnect the battery to sticking the positive and negative wires together is a waste of time. This is not 1996. Modules have non volatile memory, thus the code remains. For example, you can take a 2010 car that has been sitting for 10 years without a battery and the error codes will still be there when you fire it up.

 

[Jturs]

To start with, you should get the security gateway bypass, then go back in and use something like JScan. I bought the one from ZAutomotive and thus I can now use my phone to scan all of the modules in the Jeep. In a nutshell, the security gateway module is a money shakedown box to force non dealers to pay $50/year just to access non-OBDII stuff (i.e. every module on the vehicle). We have it at work but we need it for everything FCA for 2019 onward (plus most of 2018 which includes the JL but not JK).

So, you'll be able to see what is actually going on if you bypass that security gateway. For example, my Jeep had a low voltage DTC (from the ESS) and thus threw a generic code that matched nothing I could find. The check engine light was on for two ignition cycles yet the DTC was there no matter what. Plus, other modules can throw the check engine light (i.e. Transmission, ABS etc..) that has nothing to do with OBDII. With that security gateway, you'll never see a code, yet the light can still be on (only DTC you might find is one that triggers the check engine light).

Biggest PIA was it reset the readiness monitors, thus my Jeep would not pass emissions. As of now, my Jeep has been the running joke of the shop because it took two tanks of gas and a few hundred miles of driving to get it to pass emissions. Literally it's like 1996 all over again where cars took forever to reset them. This is 2022 and pretty much everything but FCA, is not that hard to do.

Also, all of the things like disconnect the battery to sticking the positive and negative wires together is a waste of time. This is not 1996. Modules have non volatile memory, thus the code remains. For example, you can take a 2010 car that has been sitting for 10 years without a battery and the error codes will still be there when you fire it up.

I do have a security bypass gateway installed. I forgot to mention that. I used the alfa for a bunch of other stuff like speedo recalibrate ,Tpms threshold and some other bcm features. So seeing I was able to do those I'm assuming I'm not having any connection or security issues.

I also did not see a option to get into TCM.

 

[jjvincent]

Try JScan and if you pay the $20, you can access all of the modules. I literally had 12 low voltage error codes on various modules.

 

[Jturs]

Try JScan and if you pay the $20, you can access all of the modules. I literally had 12 low voltage error codes on various modules.

Sounds good thank you, I'll probably get itnon my weekend and see whay comes up.

anyone have an idea of where to get apark plugs for 2.0 turbo. Every site online is out of stock and same with local parts stores.

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