P0307 on Chrysler: How to Diagnose & Fix
Cylinder 7 Misfire Detected
2 Chrysler models · 2 documented issues · 2 critical · $2,000-$6,000 repair
P0307 on Chrysler by model: symptoms, diagnosis and fix
The 5.7L HEMI V8 suffers from an MDS lifter design defect in which the needle bearings are undersized. Lifters can be starved of oil during idle, causing seizure and catastrophic camshaft wear leading to engine failure.
Common Symptoms
- Persistent ticking or tapping noise from engine
- Ticking worsens between 80,000-100,000 miles
- Check engine light with misfire codes
- Rough idle or loss of power
- Metal shavings in oil
How to Fix
Replace all lifters, camshaft, and rocker arms as an assembly. Use only OEM or high-quality lifters. Some owners disable the MDS system. Use only SAE 5W-20 oil and maintain strict 3,000-5,000 mile oil change intervals.
Sources for this issue (2)
The MDS-equipped 5.7L HEMI is prone to lifter and camshaft failure. The roller lifters' needle bearings are hard for oil to reach and can fail when oil is degraded or the engine idles for long periods, causing catastrophic camshaft wear. Persistent ticking that worsens over time indicates lifter failure in progress.
Common Symptoms
- Persistent ticking noise at idle
- Ticking worsens over time
- Check engine light with misfire codes
- Metal shavings in oil
How to Fix
Replace all lifters, camshaft, and rocker arms. Consider Hellcat non-MDS lifter upgrade (5038784AD) for MDS delete. Use Melling high-volume oil pump 10452HV (2009+). Maintain strict 3,000-5,000 mile oil change intervals with synthetic oil.
Sources for this issue (3)
P0307 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0307 mean on a Chrysler?
P0307 stands for "Cylinder 7 Misfire Detected." P0307 means the engine computer detected a misfire on cylinder number 7 — that cylinder isn't burning its air/fuel mixture completely or at the right moment. The PCM senses this by watching for tiny slowdowns in crankshaft speed each time cylinder 7 should fire. A misfire wastes fuel, can dump raw fuel into the exhaust, and may damage the catalytic converter over time, which is why a persistent or severe misfire often makes the check engine light flash. You may feel rough idle, shaking, hesitation, or a loss of power. On Chrysler it is documented across 2 models: 300, Aspen.
What are the most common causes of P0307?
The most common causes of P0307 are: Worn, fouled, or incorrectly gapped spark plug on cylinder 7, Failed ignition coil or coil-on-plug for cylinder 7, Faulty, clogged, or leaking fuel injector, Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/leaking valve, head gasket), Damaged spark plug wire or boot (on applicable engines), Carbon buildup or sticking valve. The specific cause varies by vehicle.
How much does it cost to fix P0307 on a Chrysler?
Published repair estimates on Chrysler range from $2,000 to $6,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.