2012 Dodge Challenger P0300 Pending Code Reset & EGR Not Ready Issue: How Many Drive Cycles Required?

To better assist with your question, please share all confirmed or pending OBD-II diagnostic codes—especially the specific code number (e.g., P0300). This helps confirm whether we're discussing a misfire or another system fault. Regarding the EGR issue: It seems unusual that your 2012 Challenger lacks an EGR valve, as VVT-equipped engines typically don't include one. Have you removed any EGR components? If not, this may indicate a software-level discrepancy. I'll verify this detail over the weekend—please note that my response time might be delayed. Also, confirm if your vehicle is stock as delivered (no modifications or aftermarket parts).

Thanks for the clarification! You've correctly identified the issue: P0300 is an intermittent misfire code. The original 5.7L engine has been replaced with a forged block unit, which was also blown—this root cause has already been fixed and is now stable. My real concern isn't about the P0300 itself but rather the emissions reset process. My vehicle includes catalytic converters, O2 sensors, and SFI fuel injection as its primary emission systems. After resolving the misfire, I’ve observed that: - Catalytic converters and O2 sensors typically reset after 2 drive cycles (cold-hot-cold), - The Evaporative Emission System resets after about 4 cycles. However, the EGR monitor remains 'not ready' even though no EGR system exists in my vehicle. I’ve been told that even without a physical EGR valve, the PCM still runs an emissions routine to check for EGR presence and may eventually auto-program it as 'not applicable' (INC) or 'ready/ok'. After 6 complete drive cycles, all monitors are clear except EGR. Since clearing the P0300 would reset all I/M monitors back to zero, I’ve chosen not to clear it—so I can observe how long it takes for the system to naturally resolve this discrepancy. My question now is: How many additional drive cycles does it take for the PCM to recognize that no EGR exists and auto-update the EGR status from 'not ready' to 'ready/ok'? If the pending code doesn’t self-clear after several cycles, I may need to clear it and restart the emissions reset process. I hope this explanation is clear. If a phone call would be more helpful, please let me know—I’m happy to schedule a PM chat.

Update: After completing two full cold-hot-cold driving cycles, the pending P0300 code has cleared on its own. This confirms that the code self-resolves after approximately 2–4 drive cycles under stable conditions. The remaining question is still about the EGR monitor—why it remains 'not ready' despite no physical EGR system being present in my 2012 Challenger. I suspect the PCM may be running a default routine to check for EGR presence, and even without hardware, it might take several more cycles (e.g., 4–8) before recognizing that the component is inactive and updating its status accordingly. I’m still waiting on confirmation about how long this process takes in actual vehicles with no EGR valves. If no response comes soon, I may need to clear the code and restart the emissions reset cycle.