Noliii
Junior Member
Hello everyone,
I purchased a 2014 RAM 1500 3.6L a few months ago, and I’ve been dealing with a number of problems, mostly electrical. One of the major issues is the DTC P2305 code. Initially, the problem disappeared after I replaced all the ignition coils and spark plugs, but it came back a month later.
The issues started with the head unit getting stuck on the RAM logo, which I know is a notorious problem with Uconnect systems from this era. Then, my low-beam headlight literally melted (it was a Chinese LED with a CANbus box, but I never got an error code). A few weeks later, the P2305 code began appearing intermittently and eventually got to the point where I replaced all the coils and spark plugs. That seemed to fix the problem—for about a month.
Now, the P2305 code is back and no longer intermittent—it’s constant, accompanied by significant misfires. Occasionally, I’ll get a P0302 code as well, but it’s rare and always appears alongside P2305. I’ve never seen P0302 on its own. After a few more weeks, my left turn signal blew.
I’ve spoken with some mechanic friends, and while they haven’t inspected the truck, they suggested it’s likely an electrical issue. I’ve inspected all the wiring I could, and everything *looks* fine.
One potential concern is the 5-pin relay bypass for the fuel pump. It was using a 30-amp inline fuse, but I’ve read conflicting information about whether it should use a 20-amp or 25-amp fuse. To be safe, I’ve replaced it with a 20-amp fuse for now. Could the 30-amp fuse have caused or contributed to these electrical issues?
- The battery is brand new.
- I tested the alternator voltage at the battery terminals while the engine was running, and the results were within the average range.
- I found a wiring harness behind the battery on the driver’s side that has multiple wires, but only the black wire is connected to the negative terminal. The other wires aren’t connected to anything at all. Does anyone know what these could be for?
Has anyone experienced similar issues with a 4th-gen RAM? P2305 seems to be a fairly common problem, but I can’t figure out which part of the wiring could be causing all of this.
Thank you for your help! I’m not a mechanic, but I’ve tried all the basic troubleshooting steps that made sense. I wanted to reach out to the RAM community before taking the truck to an auto electrician.
I purchased a 2014 RAM 1500 3.6L a few months ago, and I’ve been dealing with a number of problems, mostly electrical. One of the major issues is the DTC P2305 code. Initially, the problem disappeared after I replaced all the ignition coils and spark plugs, but it came back a month later.
The issues started with the head unit getting stuck on the RAM logo, which I know is a notorious problem with Uconnect systems from this era. Then, my low-beam headlight literally melted (it was a Chinese LED with a CANbus box, but I never got an error code). A few weeks later, the P2305 code began appearing intermittently and eventually got to the point where I replaced all the coils and spark plugs. That seemed to fix the problem—for about a month.
Now, the P2305 code is back and no longer intermittent—it’s constant, accompanied by significant misfires. Occasionally, I’ll get a P0302 code as well, but it’s rare and always appears alongside P2305. I’ve never seen P0302 on its own. After a few more weeks, my left turn signal blew.
I’ve spoken with some mechanic friends, and while they haven’t inspected the truck, they suggested it’s likely an electrical issue. I’ve inspected all the wiring I could, and everything *looks* fine.
One potential concern is the 5-pin relay bypass for the fuel pump. It was using a 30-amp inline fuse, but I’ve read conflicting information about whether it should use a 20-amp or 25-amp fuse. To be safe, I’ve replaced it with a 20-amp fuse for now. Could the 30-amp fuse have caused or contributed to these electrical issues?
- The battery is brand new.
- I tested the alternator voltage at the battery terminals while the engine was running, and the results were within the average range.
- I found a wiring harness behind the battery on the driver’s side that has multiple wires, but only the black wire is connected to the negative terminal. The other wires aren’t connected to anything at all. Does anyone know what these could be for?
Has anyone experienced similar issues with a 4th-gen RAM? P2305 seems to be a fairly common problem, but I can’t figure out which part of the wiring could be causing all of this.
Thank you for your help! I’m not a mechanic, but I’ve tried all the basic troubleshooting steps that made sense. I wanted to reach out to the RAM community before taking the truck to an auto electrician.
