Few Problems after 1700 miles

[kbarker]

Hello Everyone!
Read lots of posts you guys are awesome!!!
Originally wanted a raptor, but so glad went with RHO. Got the truck in May still missing my GMC AT4 6.2 V8 with carbon pro addition, and multi tailgate. Anyway! Absolutely love this Truck.
After 300miles or so the truck had few problems on and off.
1.Warning Light illumination Unavailable Service required. Shut the engine off it goes away, it happened few times.
2. Battery low had to charge it. idle around 13.1V, Driving around at 13.5-6V
3 Right side of Paddle shifter Stuck.
4 GPS on the display does not work went all black time to times
Now took the truck did little light "Baja no jump" on Saturday for 20 mins or so. Check engine light came on. Misfire codes on cylinder 1. 3.4. 5. and 6.
Going to drop off the truck this afternoon. Very frustrating! I had the muffler deleted around 1200mile, don't think that has anything to do with the Misfire?

 

[RHOfan]

Doesn’t sound promising…several reports of melted cats with same code.

How’s it running? If no change in drivability, might be a glitch. These Fiat-based electrical systems are quite “sensitive”. I’ve never owned a more “glitchy” vehicle, though I’ve never owned an Italian car.

 

[kbarker]

@RHOfan Rough and jerky around 2K RPM, felt like the Engine is going to shuts off when idling.

 

[Webbo]

I have seen my battery that low but talked to my dealer and did some research on our AGM batteries and PCM controlled alternators. They load tested my batteries and alternator was fine. AGM batteries can handle a wide voltage fluctuation unlike flooded that likes a constant float. A PCM controlled alternator coupled with an AGM battery is said to improve efficiency and mpg because it won’t engage the alternator when an AGM battery SOC meets a minimum threshold.

I read that these PCM controlled alternators with a AGM battery look for 80% SOC on the batteries and charge based on that percentage. So if your AGM battery is already at or above that 80% SOC, the module isn’t going to tell the alternator to charge the battery. You will see the voltage increase when you let off the throttle as the PCM is getting a “free” charge. Then when you accelerate it goes back down because the PCM doesn’t want to add load to the engine with the alternator load and your acceleration, as long as the SOC is above a certain percentage.

Meaning, why would the PCM charge a battery putting extra load on the engine when the AGM battery doesn’t “need it”

Maybe others know more about PCM controlled alternators and AGM batteries and would love to hear some more perspective. Also, this is coming from a Mech Engr, I’m not great with electrical… please feel free to school me if I’m off base.

 

[kbarker]

@Webbo . Wow I Learned something today once again. Thank you for the info.

 

[Webbo]

@Webbo . Wow I Learned something today once again. Thank you for the info.

Not saying I’m right LOL, but it’s what I found with the research. Also, I put my batteries on a Noco 5 charger on its “optimization” mode for 28hrs. After the 28hrs I took it off, started the truck and was at 12.4V. So I am guessing the PCM saw “fully charged” 12V batteries and never engaged the alternator.

After a few start cycles, voltage went to 13.6V after burning some battery load starting it.

Just some observations that help justify the research on PCM controlled alternators/AGM battery combos.

 

[Deange2001]

I have seen my battery that low but talked to my dealer and did some research on our AGM batteries and PCM controlled alternators. They load tested my batteries and alternator was fine. AGM batteries can handle a wide voltage fluctuation unlike flooded that likes a constant float. A PCM controlled alternator coupled with an AGM battery is said to improve efficiency and mpg because it won’t engage the alternator when an AGM battery SOC meets a minimum threshold.

I read that these PCM controlled alternators with a AGM battery look for 80% SOC on the batteries and charge based on that percentage. So if your AGM battery is already at or above that 80% SOC, the module isn’t going to tell the alternator to charge the battery. You will see the voltage increase when you let off the throttle as the PCM is getting a “free” charge. Then when you accelerate it goes back down because the PCM doesn’t want to add load to the engine with the alternator load and your acceleration, as long as the SOC is above a certain percentage.

Meaning, why would the PCM charge a battery putting extra load on the engine when the AGM battery doesn’t “need it”

Maybe others know more about PCM controlled alternators and AGM batteries and would love to hear some more perspective. Also, this is coming from a Mech Engr, I’m not great with electrical… please feel free to school me if I’m off base.

This is consistent with what I was able to gather online. Alternator will go into float mode and let battery do its thing. When it gets low enough the alternator kicks back on. Glad someone else also looked into this and confirmed it. Def eases the battery fluctuation debate.

 

[kbarker]

Service advisor just called, it looks like need new catalytic converters for the misfire
They need engineering approval to order them. Asking what fuel is being used.

 

[RHOfan]

Service advisor just called, it looks like need new catalytic converters for the misfire
They need engineering approval to order them. Asking what fuel is being used.

I’ve read they are looking to confirm you only use “top tier” fuel (of at least 91 octane). Don’t know if failure to use top tier gas will impact the warranty coverage. Seems unlikely, but you never know…

 

[RAM-Ranch-MT]

Service advisor just called, it looks like need new catalytic converters for the misfire
They need engineering approval to order them. Asking what fuel is being used.

I’ve read they are looking to confirm you only use “top tier” fuel (of at least 91 octane). Don’t know if failure to use top tier gas will impact the warranty coverage. Seems unlikely, but you never know…

Well Well well...............all the penny pincher 89 octane boys shaking in their boots right now. LOL. Praying their cats dont melt and ram sees they been running piss water fuel........... LOL. all jokes

 

[Mikey Swift]

Well Well well...............all the penny pincher 89 octane boys shaking in their boots right now. LOL. Praying their cats dont melt and ram sees they been running piss water fuel........... LOL. all jokes

You mean 87...cats out here really trying to run tap water in these engines.

 

[MattH89]

Well Well well...............all the penny pincher 89 octane boys shaking in their boots right now. LOL. Praying their cats dont melt and ram sees they been running piss water fuel........... LOL. all jokes

Don't worry - all you gotta do is tell em you saw a video on YT where an engineer said you can run 87. They'll approve your warranty claim immediately when confronted with such irrefutable evidence.

 

[kbarker]

Melted Cats, parts have been ordered. Should be ready in a week or so.
Service advisor did mention, can't promise it wont happen again, since they do not know what caused it.

 

[itsmekylep]

Deleted your muffler you say? What’s that sound like?

 

[kbarker]

@itsmekylep A little loud for my liking, it does drone around 2000 -2500RPM at 80-85MPH but nothing terrible. Turn the radio volume to 14 then you barely hear it if t. Similar to MRT Extreme. Sounds pretty good especially only cost $200.
Im thinking maybe add a Magnaflow X- Pipe muffler to taking care of the drone, or a J Pipe.

 

[kbarker]

Just an update, after replaced both cats still have a misfire present. An engineer from RAM came in and ordered an ignition module. Very frustrating.