P0305: Cylinder 5 Misfire Detected
66 vehicles · 21 makes · $50-$15,000 repair
Most Reported On
P0305 is an OBD-II diagnostic trouble code meaning “Cylinder 5 Misfire Detected.” This code means the engine control module detected a misfire on cylinder number 5, meaning that cylinder is not burning its air-fuel mixture properly on some combustion cycles. The computer senses misfires by watching for tiny fluctuations in crankshaft speed each time a cylinder fails to fire correctly. A misfire wastes fuel, can make the engine run rough or shake, and dumps unburned fuel into the exhaust, which can overheat and damage the catalytic converter. It generally points to a problem with spark, fuel delivery, or compression specifically affecting cylinder 5. This code is most commonly reported on 2011-2019 Hyundai Sonata (Base, GL, GLS, LX, Limited, SE, SEL, SEL Plus, Sport), 1999-2005 Mazda MX-5 Miata, and 2011-2019 Hyundai Tucson (GLS, Limited, SEL, Sport, Ultimate, Value), plus 63 other vehicles, with repair costs ranging from $50 to $15,000.
Common Causes
Typical Repair Cost
Based on 84 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0305, 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 (66)
Cylinder Misfire Diagnosis and Ignition-Coil Failure — 2.7T APB/BEL
Fuel-Quality or Deposit-Related Rough Running and Misfire Diagnosis
2009-2025 Q5 Gasoline-Quality Deposit Diagnosis - TSB 2014753/13
2019-2021 A6 3.0L Misfire Codes - Check ECM Software Before Mechanical Cleaning
2007-2008 RS4 Deposit-Related Cold-Start Misfire - Diagnose Before Cleaning
Valve Cover Gasket Oil Leak
Intake Valve Carbon Buildup
S58 Intake Valve Carbon Buildup
S58 Intake Valve Carbon Buildup
S63/S63TU Ignition Coil Premature Failure
N54 High Pressure Fuel Pump (HPFP) Failure - E89 Z4 sDrive35i/35is
Direct Fuel Injector Failure (S55)
Valve Cover Gasket Oil Leak (M52/M54 6-Cylinder)
S55 High-Pressure Fuel Injector Failure - F82/F83 M4
4.3L Vortec CSFI "Spider" Injector Poppet Valve Leaking/Clogging
5.3L V8 Active Fuel Management (AFM) Lifter Collapse and Camshaft Damage
AFM/DFM Lifter Failure (5.3L/6.2L V8)
Injector Wiring Harness Chafing (Duramax)
Cylinder Head Valve Seat Failure and Misfire on 3.5L/3.7L Inline-Five
HEMI 5.7L MDS Lifter and Camshaft Failure
Pentastar Cylinder Head Failure
5.7L HEMI MDS Lifter Tick and Camshaft Failure
3.6L Pentastar Valvetrain Failure (Rocker Arm / Lifter Ticking, Misfire, Engine Damage)
HEMI MDS Lifter Tick
HEMI MDS Lifter Tick
Pentastar V6 Rocker Arm/Lifter Tick
HEMI Lifter/MDS Tick
Pentastar V6 Rocker Arm/Lifter Tick
Rod Bearing Failure from Oil Starvation (Track Use)
Valve Spring Failure on 6.4L 392 HEMI (High-RPM and Modified/Boosted Cars)
Random Misfire / Rough Idle (P0300) From Worn Spark Plugs & Failing Ignition Coils
1.5L EcoBoost 3-Cylinder Coolant Loss and Engine Failure
3.5L EcoBoost Intercooler Condensation Causing Shudder and Limp Mode
2.7L EcoBoost Coolant Intrusion from Cracked Cylinder Head
3.5L EcoBoost (Gen 1) Intake Valve Carbon Buildup — Misfire, Rough Idle, Power Loss
4.6L 2-Valve Triton V8 Spark Plug Ejection / Stripped Head Threads (TSB 07-21-2)
4.0L SOHC / OHV Waste-Spark Coil Pack Misfire (P0300 Series)
Ignition Coil Pack Failure
3.5L EcoBoost Ignition Coil and Spark Plug Misfire (Often Caused by Broken Exhaust Manifold Studs)
5.4L 2-Valve Spark Plug Blow-Out From Cylinder Head
4.6L 2-Valve Spark Plug Ejection/Breakage
Fuel Injector Debris Causing Misfires and Catalyst Codes
Spark Plugs Backing Out - Coil Pack Melting and Engine Damage
Valve Cover Gasket and Spark Plug Tube Seal Oil Leak Causing Misfires
Valve Cover Gasket and Spark Plug Tube Seal Oil Leaks Causing Misfires
Timing Belt and Water Pump Neglect Leading to 3.2L V6 Engine Damage
HEMI Engine Tick/Lifter Noise
3.6L Pentastar Rocker Arm / Lifter Needle-Bearing Failure — Valvetrain Tick, Misfire & Cam Damage
3.6L Pentastar V6 left cylinder head failure / engine tick (early build)
2018-2022 WK / 2021-2025 WL 3.6L Intake Camshaft and Rocker Wear
Ignition Coil Rail Failure Causing Misfire on 4.0L
2.7L EcoBoost Excessive Oil Consumption from Faulty Valve Guides
Navigator 5.4L 3V Triton Spark Plug Breakage on Removal
Coil-on-Plug Ignition Coil Failure and Misfires (4.6L V8)
HEMI Lifter/Camshaft Failure
MDS Lifter Failure and Hemi Tick (5.7L)
6.4L HEMI Valvetrain Failure (Roller Lifter/Camshaft Wear, "HEMI Tick")
5.7L HEMI MDS Lifter Failure
3.0L Hurricane Twin-Turbo I6 Random Misfire (P0300) on Early-Build Trucks Needing ECU/Ignition Reflash
2.5L 5-Cylinder Ignition Coil Pack Failure
EA211 1.5T Engine Ticking and Fuel Injector Noise
Ignition Coil Pack Cracking and Misfires
Ignition Coil Pack Failure Causing Misfires (2.0 ABA and VR6)
VR6 coil pack casing cracking causing misfires (worse in wet weather)
FAQ
What does P0305 mean?
P0305 stands for "Cylinder 5 Misfire Detected." This code means the engine control module detected a misfire on cylinder number 5, meaning that cylinder is not burning its air-fuel mixture properly on some combustion cycles. The computer senses misfires by watching for tiny fluctuations in crankshaft speed each time a cylinder fails to fire correctly. A misfire wastes fuel, can make the engine run rough or shake, and dumps unburned fuel into the exhaust, which can overheat and damage the catalytic converter. It generally points to a problem with spark, fuel delivery, or compression specifically affecting cylinder 5.
What are the most common causes of P0305?
The most common causes of P0305 are: Worn or fouled spark plug on cylinder 5, Failed ignition coil or coil pack for cylinder 5, Faulty or clogged fuel injector on cylinder 5, Vacuum or intake air leak affecting that cylinder, Bad spark plug wire or boot (on applicable engines), Low compression from worn rings, valves, or head gasket, Carbon buildup or sticking valve on cylinder 5, Lean or rich fuel condition affecting the cylinder. The specific cause varies by vehicle.
How much does it cost to fix P0305?
Repair costs for P0305 range from $50 to $15,000, depending on the vehicle and root cause.
Which vehicles are affected by P0305?
Au7o has documented P0305 across 66 vehicle models from 21 manufacturers: Acura, Audi, BMW, Chevrolet, Chrysler, Dodge, Ford, Honda, Hyundai, Jaguar, Jeep, Lexus, Lincoln, Mazda, Nissan, RAM, Ram, Saturn, Subaru, Toyota, Volkswagen.
Sources (12)
- RecallNHTSA Recall 17V-224
- RecallNHTSA Recall 19V-601 - Engine Bearing Failure
- 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
- mediaClassAction.org: New Hyundai, Kia Engine Failure Settlement Covers 2.1M Additional Vehicles
- mediaMyCarVoice: Hyundai Elantra 1.8L Nu Engine Class Action Settlement
- mediaSauder Schelkopf: Hyundai Elantra and Kia Forte Nu Engine Failures Class Action Investigation
- mediaTop Class Actions: Kia, Hyundai engine failure class action settlement
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.