P302 and P2305 Diagnostic Guide for 2011 Dodge Ram 4.7L Engine
This is my first post on the forum, so any assistance would be greatly appreciated. I recently performed routine maintenance on my 2011 Dodge Ram 1500 with a 4.7L engine — replacing spark plugs and one of the coil packs for cylinder #2. After this work, I'm now seeing both P302 and P2305 diagnostic codes. The truck is due for inspection soon, and I need to resolve these issues before then. I would like to understand what these codes mean and how to properly diagnose and fix them. Specifically: - Was the code present before I replaced any parts? - Could the issue be related to a faulty coil pack or spark plug? - Are there known wiring or control circuit problems associated with P2305 on this engine model? I used NGK spark plugs during maintenance, and have already cleaned all six fuel injectors — they appear to be functioning correctly. However, the engine still runs roughly, occasionally stutters, and shuts off intermittently. I'm now considering replacing the fuel pump as a next step, but I want to confirm whether this is necessary or if there's a more targeted fix for these specific codes.
Could you please specify the model year of your vehicle? The P2305 code relates to ignition coil secondary circuit insufficient ionization, which affects cylinders 2 and 5. Before replacing parts, it's important to confirm whether these codes were present prior to maintenance. What brand spark plugs did you install? Using non-OEM brands can sometimes cause misfires or trigger error codes. Always consider using OEM or factory-recommended parts when possible. As a quick diagnostic step: try swapping the coil pack from cylinder #2 with another known-good cylinder (e.g., cylinder #4). If the code moves to the new cylinder, it likely points to a faulty coil. If the code remains on cylinder #2, then the issue may be in the wiring or control circuit.