check engine light on brand new 392

[Andras]

Took delivery on a final edition 392 2 weeks ago. On the way home from the dealship on the check engine light came on. (P219B bank 2 air-fuel ratio imbalance). Took it back to the dealership - they only cleared the code and took it to a test drive and gave it back to me with "It's done".
Again - on the way home the light came back.

Now the jeep is in the service and they could not diagnose what is the problem 3 days now. They opened up intake manifold, checked voltage levels, tracing wire shortages. They could not figure it out.

I even opened a case with Jeep - but they did not provide any assistance either.

HELP!!!

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[Old Dogger]

@JeepCares Maybe they can help you.

 

[dsgrey]

One person's resolution though others never updated with their resolution
Code

I can't believe they cleared the code, drove a few miles and just handed it back.

 

[GATORB8]

This looks like a tough one. The only Hemi I have is in the Ram, but here's some info from it's description of that code:

Theory of Operation
The purpose of the Cylinder Imbalance Detection diagnostic monitor is to detect an air/fuel ratio imbalance between the cylinders across an entire cylinder bank.


NOTE: Although the DTC description does not indicate as such, this fault will set because a specific cylinder on this bank is out of balance with the other cylinders. The fault may not be easily noticeable to the technician. During diagnosis, it is necessary to pay close attention to small differences between the cylinders during each of the test steps.This imbalance can be caused by a number of different malfunctions including but not limited to:

• Exhaust Manifold to Cylinder Head leak at a specific cylinder.
• Intake Manifold leak at a specific cylinder.
• Fuel Injector problem.
• Variable cam lift failure.
• Camshaft/ Valvetrain problems.
• Ignition system problems at a specific cylinder.
• Engine mechanical problems relating to cylinder combustion at a specific cylinder.

The Cylinder Imbalance Detection requires that the Upstream Oxygen (O2) Sensors are capable of operating at high frequencies, since an aged O2 Sensors response capability at a higher frequency range can be degraded. Therefore, before this monitor can become active, the O2 Sensor High Frequency Response monitor is performed to see if the sensor is even capable of detecting an imbalance.

Once active, the Cylinder Imbalance Detection monitor matches up the Upstream O2 Sensor signal with the corresponding cylinders on that bank. Each cylinder is monitored and adjustments are made as needed for each cylinder to correct an air/fuel ratio imbalance. If an individual cylinder reaches a calibrated adaptation threshold (15%), the diagnostic monitor will be considered failing.

 

[21xtremewrangler]

Sounds like you got a lemon bring it in 3 times you are already going to be on the second and than you can lemon law it and get another. Don’t bother jeep service is incompetent at best.

 

[Andras]

thanks, this is definitely going that way.

On top of that - I did notice the car had 60 miles on it when I took delivery (asked the sales why, they claimed it was driven from a warehouse - that's only 19 miles away. At least ~20 miles not accounted for.

My guess they had the check engine light before they delivered it, they tried to diagnose and just reset/test drove and that's how they give it to me. But I can't prove it.

 

[Mike_Hawk]

Did you check that all the fuses are seated? Go through and push down on every one. Might sounds too simple of a mistake for the factory and dealer to miss... but it's Jeep we're talking about here

 

[Andras]

I did (not the service tech). I also asked them to swap the O2 sensors, but they haven't done that.

 

[swampflyer]

Why are technicians called technicians when it’s pretty evident they are not?

 

[JeepCares]

Took delivery on a final edition 392 2 weeks ago. On the way home from the dealship on the check engine light came on. (P219B bank 2 air-fuel ratio imbalance). Took it back to the dealership - they only cleared the code and took it to a test drive and gave it back to me with "It's done".
Again - on the way home the light came back.

Now the jeep is in the service and they could not diagnose what is the problem 3 days now. They opened up intake manifold, checked voltage levels, tracing wire shortages. They could not figure it out.

I even opened a case with Jeep - but they did not provide any assistance either.

HELP!!!

Hi Andras,

This is not the vehicle experience we had hoped for. We see you may already have a case opened with Jeep but if you need extra support, please send our team a private message.

Blair
Jeep Cares

 

[Jeep Wick]

Took delivery on a final edition 392 2 weeks ago. On the way home from the dealship on the check engine light came on. (P219B bank 2 air-fuel ratio imbalance). Took it back to the dealership - they only cleared the code and took it to a test drive and gave it back to me with "It's done".
Again - on the way home the light came back.

Now the jeep is in the service and they could not diagnose what is the problem 3 days now. They opened up intake manifold, checked voltage levels, tracing wire shortages. They could not figure it out.

I even opened a case with Jeep - but they did not provide any assistance either.

HELP!!!

You should be able to return it. Make them buy it back. You immediately had a problem and they can't figure it out? Get rid of this one.

 

[alphawolff]

One person's resolution though others never updated with their resolution
Code

I can't believe they cleared the code, drove a few miles and just handed it back.

That's a different engine. What gator linked is correct, this DTC essentially indicates what it says, a fuel-air ratio imbalance on the right bank (bank 2).

Personally I would replace the right bank o2 sensors (it's warranty, why the fuck would I swap them side to side?) before going any further. It's possible there's a damaged sensor in there. If that doesn't work I'd smoke test the intake manifold for a possible vacuum leak. Could be a leaking exhaust manifold as well, but you'd hear that. Assuming that's OK then compression test it, it might just be a faulty engine. Generally the O2 sensor self-test must pass before this DTC could be thrown, but that test isn't always the most accurate. I have replaced plenty of O2 sensors for this DTC on the 2.0L especially.

That being said, unless you special ordered this vehicle I'd make them buy it back if they can't fix it in like a week. Stellantis' build quality, especially on the JLs, has been atrocious this year. The 392s are usually pretty solid so long as you keep them stock.

Why are technicians called technicians when it’s pretty evident they are not?

You'd be surprised how many problems (4xes especially) have almost zero diagnostic information. This DTC is literally "Here's all the things that could possibly cause this. Check them one by one until you find the problem".

 

[Andras]

update: today I was told "we just ordered the O2 sensors".
I took delivery on the 17th. Today now is day 13 the car has been broken and they still haven't figured out what's wrong with it.

Worth to mentioned I got absolutely no assistance from Jeep either - even after opening a case.

Lemon law is day 20 in NJ.

 

[mwilk012]

update: today I was told "we just ordered the O2 sensors".
I took delivery on the 17th. Today now is day 13 the car has been broken and they still haven't figured out what's wrong with it.

Worth to mentioned I got absolutely no assistance from Jeep either - even after opening a case.

Lemon law is day 20 in NJ.

You could be driving it. The defect does not affect the operation of the vehicle at this point, correct?

 

[NPC 20883467]

Lemon law is day 20 in NJ.

What are you waiting for? Do you think after they "fix" it things will all be skittles & rainbows? Get rid of the damned thing, now!!

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