Check Engine P0300 2021 Ram 1500 Hemi V8

[richheise]

My truck had a P0300 check engine light a few weeks ago. Truck had a rough idle for a week or so before the light came on. According to Autozone reader, it said it was likely ignition coil or plugs. I bought new plugs and coils and swapped everything out. Reset check engine light and all seemed well. About 3 days later, the light came back on so I contacted the dealership to schedule an appointment. They told me I would have to drop my truck off for a minimum of 48 hours for them to run diagnostics.
Back story - several months ago had to have an exhaust manifold replaced (under warranty) due to cracking. Had to rent a car for 5 days and was told by the dealership that Dodge would reimburse me since this is a warranty issue. Once the service was completed, Dodge said no reimbursement because I don't have a service contract. So I am hesitant to drop my truck off again because I shouldn't have to rent a car for them to run diagnostics.
So I scheduled an appointment with a local mechanic, but day of the appointment the light was off again so they couldn't find a code and had no idea what to check. The light has come back on intermittently for the past several days and now there is an idle surging occasionally, especially when I am in reverse. Truck still idles rough and seems to have an issue. Maybe bad fuel injectors?
Any idea how to figure out the issue? I really don't want to have to take the truck back to the dealership and rent a car again while they try to find an issue.

Thanks.

 

[RLee276]

My truck had a P0300 check engine light a few weeks ago. Truck had a rough idle for a week or so before the light came on. According to Autozone reader, it said it was likely ignition coil or plugs. I bought new plugs and coils and swapped everything out. Reset check engine light and all seemed well. About 3 days later, the light came back on so I contacted the dealership to schedule an appointment. They told me I would have to drop my truck off for a minimum of 48 hours for them to run diagnostics.
Back story - several months ago had to have an exhaust manifold replaced (under warranty) due to cracking. Had to rent a car for 5 days and was told by the dealership that Dodge would reimburse me since this is a warranty issue. Once the service was completed, Dodge said no reimbursement because I don't have a service contract. So I am hesitant to drop my truck off again because I shouldn't have to rent a car for them to run diagnostics.
So I scheduled an appointment with a local mechanic, but day of the appointment the light was off again so they couldn't find a code and had no idea what to check. The light has come back on intermittently for the past several days and now there is an idle surging occasionally, especially when I am in reverse. Truck still idles rough and seems to have an issue. Maybe bad fuel injectors?
Any idea how to figure out the issue? I really don't want to have to take the truck back to the dealership and rent a car again while they try to find an issue.

Thanks.

Did you get it figured out

 

[richheise]

Did you get it figured out

No. The check engine light will stay on for a couple days and I will schedule time with a local shop to have them look, but then the light goes out before they get a chance to try and figure it out. It stays off for a couple weeks, then randomly comes back on for 1-2 days and goes off again. Very frustrating.

 

[Scram1500]

Check the wiring and make sure nothing is damaged, fault could be right at the socket