Engine Check Malfunction Indicator warning light Triggered on Mojave

[ChrisNLA]

Do you here anything "audible" with these misfire events?

Not to answer for Shadow, by my '22 had the same P0300 event at 1,527 miles. Running rough, etc. Flashing engine light and then went to solid. It was audible as far as I was concerned. I could hear the engine chugging / misfiring, not just feel it.

Anyway, it went away a few moments later and returned to running smoothly. After about 50 miles of driving, 6 key cycles, and disconnecting the battery the light turned off.

I'm at 2,105 miles now. Has not repeated, yet. Engine runs dead quiet. I can hear the pulleys, belts, fuel injectors, and exhaust over the valvetrain when its sitting idling.

Sponsored

 

[joeym7]

I'm guessing mine will turn into either:
1) We can't find anything, but we reset it.
2) Something trivial like a bad gas cap.
3) Or something like a faulty sensor making the CEL activate.

I say this based on comments received and their descriptions and the fact that my Mojave is just running so nice at this time.

Of course just a guess, and it could be something else.

 

[joeym7]

With charging systems it's always "put on a new regulator" or "change the alternator" or "you have a loose belt" and usually every answer is wrong, the guy has spent a couple hundred dollars and days swapping parts - and it was a connection - a free fix.

Has anyone reported this type of trigger event on the Gladiator?

G: "Can topping off gas cause check engine light?
Can overfilling the gas tank cause the Check Engine light to come on? Yes, overfilling the gas tank can trigger the "Check Engine" light to come on. Modern cars are equipped with the Evaporative System that prevents gasoline vapors from escaping into the atmosphere."

 

[ShadowsPapa]

Has anyone reported this type of trigger event on the Gladiator?

G: "Can topping off gas cause check engine light?
Can overfilling the gas tank cause the Check Engine light to come on? Yes, overfilling the gas tank can trigger the "Check Engine" light to come on. Modern cars are equipped with the Evaporative System that prevents gasoline vapors from escaping into the atmosphere."

A year or so back a couple of people said they had issues and the dealer ended up replacing the canister as it had been flooded with gas due to trying to get more in after it clicked off.
Did it trigger the light? I can't say, but if you think about it - something made them take it to the dealership.
If you were closer as I'd say come on over and I'd connect up and grab the codes and any associated data stored.

But in short - that is a possibility.

 

[joeym7]

A year or so back a couple of people said they had issues and the dealer ended up replacing the canister as it had been flooded with gas due to trying to get more in after it clicked off.
Did it trigger the light? I can't say, but if you think about it - something made them take it to the dealership.
If you were closer as I'd say come on over and I'd connect up and grab the codes and any associated data stored.

But in short - that is a possibility.

There is a good chance this might be the one, this started right after a fill-up, I thought about bad gas but the truck is just running too fine for that.

 

[joeym7]

Good News: Today I took her for a "last call" 14 mi Joy ride ahead of my appointment in the hopes the indicator would go off...On the way home, I stopped, shut down, got back it. When I turned the MO back on the service engine light was extinguished...I did a few more on off cycles to make sure I wasn't dreaming ;-). Hooray! all gone. Since it went on I'd say I hade to drive some 50 miles until it went off, which isn't too far from the manuals estimate of 20-40 miles (if) it is something that would normally clear.

Now I don't have to go to my 7AM appointment Tuesday and sit in the dealership all morning - Yippie!

 

[ShadowsPapa]

And you aren't the slightest bit curious or care about what the problem was - no big deal, or a big malfunction that could pop up at any time, doesn't matter, right? ;-)

I'm curious as to where you see 40 miles........... it's the number of start and drive cycles, not miles.
I have the manual in PDF form and searched, never did find where it says miles. Heck, you could drive 40 miles on one trip. But it does checks at each start and if you pass 2 or 3 start cycles with no further issues, it will clear regardless of miles.
Well, hope ignoring it doesn't lead you to catastrophic repairs later, or expensive repairs like converters and so on.

This is a quote from the owner's manual -

The Engine Check/Malfunction Indicator Light (MIL) is a
part of an Onboard Diagnostic System called OBD II that
monitors engine and automatic transmission control
systems. This warning light will illuminate when the ignition
is in the ON/RUN position before engine start. If the bulb
does not come on when turning the ignition switch from OFF
to ON/RUN, have the condition checked promptly.
Certain conditions, such as a loose or missing gas cap, poor
quality fuel, etc., may illuminate the light after engine start.
The vehicle should be serviced if the light stays on through
several typical driving styles. In most situations, the vehicle
will drive normally and will not require towing.

If any of these systems require service, the OBD II system
will turn on the Malfunction Indicator Light (MIL). It will
also store diagnostic codes and other information to assist
your service technician in making repairs. Although your
vehicle will usually be drivable and not need towing, see an
authorized dealer for service as soon as possible.

Onboard Diagnostic System (OBD II) Cybersecurity
Your vehicle is required to have an Onboard Diagnostic
system (OBD II) and a connection port to allow access to
information related to the performance of your emissions
controls. Authorized service technicians may need to access
this information to assist with the diagnosis and service of
your vehicle and emissions system.

For further information, refer to “Cybersecurity” in “Multi-
media”.

CAUTION!

• Prolonged driving with the MIL on could cause further
damage to the emission control system. It could also
affect fuel economy and driveability.

We can probably say it wasn't a loose gas cap because -

Loose Fuel Filler Cap Message
After fuel has been added, the vehicle diagnostic system can
determine if the fuel filler cap is possibly loose, improperly
installed, or damaged. If the system detects a malfunction,
the “gASCAP” message will display in the odometer
display. Tighten the gas cap until a "clicking" sound is heard.
This is an indication that the gas cap is properly tightened.
Push the odometer reset button to turn the message off. If the
problem persists, the message will appear the next time the
vehicle is started. This might indicate a damaged cap. If the
problem is detected twice in a row, the system will turn on
the MIL. Resolving the problem will turn the MIL off.

Gee, it tells you on the odometer display. "GASCAP" (for the Brits, it probably says fuel tank bonnet or something like that)

My truck, I'd want to know.

 

[joeym7]

You make me laugh, you haven't brought yours in yet to the dealer and you said it has happened several times....I'm just doing as you "say", not as you "do" ;-).

I went by the book, I gave you the exact quotes in my o.p. what the manual states in this regard....Page 142, 2022 manual. They stipulate IF it doesn't go off bring it in. The 40 miles come from several Jeep dealers websites - they all had the same write up, so yea, I concede that wasn't in the manual, it was a different "good" source...I did both to cover all bases, about 50 miles of several driving modes as well as many start cycles.

The Mopar Nany sent me an e-mail the day it kicked-off (I like this Nanny, others I don't ;-)), will be interesting if Nanny send me another one now that it is extinguished.

Get your truck in already given it keeps coming back - aren't you curious???

If Nanny finds out you may even void your Warranty!!!

Sponsored