← Back to list

Jeep SRT8 Misfire Codes P0301, P0303, P0305, P0307 and P0172 - What Should I Do?

Model: jeep srt8 Fault Code: P0301 Posted: 2016-05-24 14:56

I'm looking for help with a misfire issue on my 2008 Jeep SRT8 (6.1L Hemi). The vehicle is showing misfire codes P0301, P0303, P0305, and P0307, along with a P0172 code for rich fuel mixture. I've already checked the spark plugs, coil packs, and all electrical connections. The issue persists. Could you please advise on what steps I should take next? Is it possible that the crankshaft position sensor is faulty? I’ve only added headers over the past three years, and no other modifications have been made to the engine or exhaust system.

Related fault codes
P0301P0303P0305P0307
Comments (3)
Anonymous 2016-05-24 15:15

You're experiencing P0301, P0303, P0305, and P0307 along with P0172. Are these current codes or pending/historical ones? If they are active (current), please confirm — they should be visible in real-time on your scan tool. Are you running a 6.1L Hemi engine? Is your Jeep stock, without aftermarket modifications? Have there been any recent repairs or work done to the vehicle? Can your OBD2 scanner display live data such as B2S1 and B1S1O2 sensor voltages, and fuel trim values? In the meantime, a fuel pressure test is recommended.

Anonymous 2016-05-24 15:42

Yes, it's a 6.1L Hemi from a 2008 model. I took my vehicle to an auto shop recently — they suggested that the crankshaft position sensor might be faulty. Is this a plausible diagnosis? I only added headers about three years ago.

Anonymous 2016-05-24 16:21

There is no simple fix for this issue. The symptoms suggest you'll need professional diagnostic support. I don't believe the crankshaft position sensor is at fault — that diagnosis points to a lack of technical competence on the part of the shop. A proper scan tool capable of reading live data from the vehicle's ECU is essential. You must check actual sensor voltages, fuel trim values, and real-time engine parameters. This type of high-performance vehicle requires specialized knowledge and tools. Consider performing a fuel pressure test first — then with the key on and engine off, monitor how quickly the fuel pressure drops to assess for potential issues.