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Dodge Ram 5.9 Engine Misfire: P0305 to P0301 - Causes, Diagnostics & Fuel Injector Fix

Model: Dodge Ram 5.9 Fault Code: P0301 Posted: 2007-08-30 20:43

My son owns a 2001 Dodge Ram 1500 5.9L V8 (gasoline), 4x4 automatic with 180,000 miles. Previously, the truck showed a P0305 code — which was resolved by replacing spark plugs, wires, cap, and rotor. No further issues were reported after that service. Recently, the Check Engine Light came back on, this time showing a P0301 code. I’ve ruled out spark plugs and ignition wires — they were replaced with original OEM parts installed by Dodge. The misfire has shifted from cylinder 5 to cylinder 1, which makes me suspect it's not a simple plug or wire issue. I’m wondering if the oxygen sensors have ever been replaced — could failing O2 sensors be causing intermittent misfires on odd cylinders? While valve problems typically don’t cause such a shift in affected cylinders, dirty fuel injectors remain a possibility. A compression test is next, but my primary concern is whether it's the same cylinder bank (likely the 1-4 bank) with a cracked cylinder head. The truck runs smoothly otherwise — no rough idle, smells, or leaks. The only noticeable issue is the intermittent misfire. Any insights on diagnosing this shift in misfire location would be greatly appreciated.

Related fault codes
P0301
Comments (4)
Anonymous 2007-08-31 07:00

My first recommendation would be to perform a compression test and inspect the fuel rail on the affected side of the engine. Spark coils are known to fail on older Dodge Ram 5.9 engines — especially in high-mileage units. If you purchased the truck from a dealer, I’d recommend returning to them immediately for further diagnosis and repair.

Anonymous 2007-08-31 07:04

The 5.9L V8 engine in Dodge Rams is prone to fuel rail contamination with dirt or debris — this can lead to inconsistent fuel delivery and misfires, especially on specific cylinders.

Anonymous 2007-08-31 10:31

I took the truck back to the dealer this morning. They confirmed the issue and stated they would replace the fuel injectors. I told them that’s great — but I don’t want to be back with another Check Engine Light on Tuesday. They’ve agreed to cover the cost (approximately $300) for three new injectors. While $300 seems high for a Ford V8, is it reasonable for a Dodge Ram 5.9? Update: Three fuel injectors are being replaced. I also requested a fuel filter replacement as part of the service. Thanks again for the helpful advice!

Anonymous 2007-08-31 13:59

For a Ford V8, $300 is a fair price — but for a Dodge Ram 5.9 with high mileage and known engine issues, $300 for three injectors seems reasonable given the complexity and common failure points in that model.