P0307: Cylinder 7 Misfire Detected
21 vehicles · 10 makes · $100-$7,000 repair
Most Reported On
P0307 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2011-2023 Chrysler 300 (300C, C, S, SRT8), 2009-2019 RAM 1500, and 2011-2023 Dodge Durango (Citadel, Limited, R/T, SRT, SRT 392, SRT Hellcat), plus 18 other vehicles, with repair costs ranging from $100 to $7,000.
Common Causes
Typical Repair Cost
Based on 24 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0307, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (21)
5.3L Vortec AFM Active Fuel Management Oil Consumption and Lifter Failure
AFM/DFM Lifter Failure (5.3L/6.2L V8)
Injector Wiring Harness Chafing (Duramax)
5.3L V8 (AFM/DFM) collapsed/failed lifter causing ticking and cylinder misfire
L99 AFM Lifter Failure and Camshaft Damage on 6.2L Automatic Cars
HEMI MDS Lifter Tick
HEMI MDS Lifter Tick
Pentastar V6 Rocker Arm/Lifter Tick
HEMI Lifter/MDS Tick
Pentastar V6 Rocker Arm/Lifter Tick
FAQ
What does P0307 mean?
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.
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?
Repair costs for P0307 range from $100 to $7,000, depending on the vehicle and root cause.
Which vehicles are affected by P0307?
Au7o has documented P0307 across 21 vehicle models from 10 manufacturers: Audi, Cadillac, Chevrolet, Chrysler, Dodge, Ford, Jeep, Lincoln, RAM, Volkswagen.
Sources (12)
- ForumRamForumz: Cam / lifter failure class action
- ForumRamForumz: Ram hemi cam/lifter failure thread
- otherCarComplaints: 2011 Dodge Ram 1500 Lifter And Cam Issue
- ForumRamForumz: Cam / lifter failure class action page 4
- ForumRamForumz: Ram hemi cam/lifter failure thread page 8
- videoYouTube - How to Fix HEMI MDS Lifter Tick on Jeep Grand Cherokee by Scotty Kilmer
- mediaChevy AFM Problem Years Explained - ChevyGuide
- ForumAnother 5.3 with AFM bites the dust - GM Truck Club
- ForumGM 5.3L AFM Delete on 2007 Avalanche - Green Tractor Talk
- articleLincoln Town Car P0301: Cylinder 1 Misfire (Causes + How to Fix) — Drivetrain Resource
- articleHow To Test The Coil-On-Plug Ignition Coils (1998-2011 4.6L Crown Victoria, Grand Marquis) — identical Panther 4.6L powertrain as Town Car
- articleFord DG508 Ignition Coil Failure: Misfires in 4.6L & 5.4L V8s (names Crown Victoria, Town Car, Grand Marquis) — Go-Parts
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.