P0305 OBD-II Trouble Code: Cylinder 5 Misfire Detected

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0305 code

P0305 is a diagnostic trouble code (DTC) for "Cylinder 5 Misfire Detected". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P0305 DIAGNOSTIC Get a fair and transparent estimate upfront

P0305 code definition

Cylinder 5 Misfire Detected

What the P0305 code means

P0305 is a generic OBD-II code that the engine control module (ECM) detected a misfire on cylinder number 5 of the engine.

What causes the P0305 code?

  • The spark plug is not firing for cylinder number 5 due to fouling or cracks in insulation.
  • The ignition coil for cylinder number 5 has stopped firing.
  • The spark plug wire or plug boot is leaking ignition spark to ground for cylinder number 5.
  • The valve cover is leaking oil into the spark plug holes and shorting the spark plug firing for cylinder number 5.

What are the symptoms of the P0305 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory.
  • The Check Engine Light may flash during a misfire event indicating catalyst damage may occur.
  • The engine will have a misfire causing a buck or jerk and a rough idle.
  • The engine may lack some power during acceleration while the misfire is active.

How does a mechanic diagnose the P0305 code?

  • Scans codes and documents the freeze frame data in order to verify the problem

  • Clears the engine and ETC codes to verify concern comes back

  • Road tests to verify the misfire to cylinder 5

  • Removes cylinder 5 ignition coil or plug wire and checks for evidence of spark tracking on outside of coil or plug boot. Also looks for oil contamination from a leaking valve cover

  • Removes and checks the cylinder spark plug and replaces or switches to a different cylinder to see if misfire moves to the other cylinder

  • Checks cylinder compression if no ignition problems are found

Common mistakes when diagnosing the P0305 code

  • Not switching the coil to a different cylinder and rescanning to see if the misfire moves to another cylinder to check if it is the coil that is bad.

  • Not switching one part at a time with a different cylinder to isolate the failed part.

How serious is the P0305 code?

A misfiring cylinder can cause the engine to run excessively rich and can damage the catalyst. The misfire will cause the engine to run rough and hesitate on acceleration resulting in decreased performance and fuel economy.

What repairs can fix the P0305 code?

  • Replacing the faulty spark plug or replacing all spark plugs as a set if failure was due to a worn out plug.

  • Replacing the leaking valve cover gasket then replacing the failed coil, plug wires, and plugs.

Additional comments for consideration regarding the P0305 code

Code P0305 is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 5 power stroke indicating the cylinder is not contributing to engine power.

Need help with a P0305 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230 to have this issue resolved.

Check Engine Light
P0305
trouble codes

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0305 code.

SCHEDULE P0305 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7294)

Rating Summary
6779
246
57
39
173
6779
246
57
39
173
 at YourMechanic

Simon

30 years of experience
8 reviews
Simon
30 years of experience
Honda Element L4-2.4L - Check Engine Light is on Inspection - Albuquerque, New Mexico
Simon was Professional, knowledgeable and patient throughout the entire process. Would highly recommend!
 at YourMechanic

Luke

17 years of experience
134 reviews
Luke
17 years of experience
Chevrolet Equinox L4-2.4L - Check Engine Light is on - Austin, Texas
Luke was friendly and professional. He did a nice job of explaining the issue with my car so that I could understand it.
 at YourMechanic

Chuy

14 years of experience
386 reviews
Chuy
14 years of experience
Toyota Camry L4-2.5L - Check Engine Light is on - Chicago, Illinois
His explained everything very clearly on what I should do next with my car and what the cheapest solutions were.
 at YourMechanic

Jose

12 years of experience
31 reviews
Jose
12 years of experience
Chrysler Pacifica V6-3.8L - Check Engine Light is on - Redlands, California
Very friendly and punctual. Knows what he is talking about. Appreciate Jose working on my car. I would recommend him to customers.


Related questions

Fuel injection issue - 2005 Buick LaCrosse

Hi there. Your vehicle has a sequential fuel injection system. When the computer detects a fault, it converts to port fuel injection (bank to bank/limp mode). The most likely cause could be an electrical short in the odd bank of...

If my codes for my engine light is P0305, P0430, P0442.

To answer the question will I pass emissions if P0305 is fixed: if the two other codes are cleared after repairs are done for the P0305 code (https://www.yourmechanic.com/article/p0305-obd-ii-trouble-code-cylinder-5-misfire-detected-by-jay-safford) and they do not come back then you may pass emissions. The...

Check Engine Light with codes P219B and P0305

Hi there. The first code denotes an air fuel mixture ratio concern; and the second code, P0305 (https://www.yourmechanic.com/article/p0305-obd-ii-trouble-code-cylinder-5-misfire-detected-by-jay-safford), is a misfire detected on cylinder 5. There are several possible causes and both codes could be a related fault. An ignition...

More related articles

P0260 OBD-II Trouble Code: Injection Pump Fuel Metering Control “B” Intermittent (Cam/Rotor/Injector)
P0260 P0260 code definition Injection Pump Fuel Metering Control “B” Intermittent (Cam/Rotor/Injector) What the P0260 code means P0260 is an OBD-II generic code that the injection pump fuel metering control valve circuit has intermittent current flow when the engine control...
P2291 OBD-II Trouble Code: Injector Control Pressure Too Low - Engine Cranking
P2291 Code Definition Injector Control Pressure Too Low - Engine Cranking What the P2291 code means This trouble code will only be...
P0429 OBD-II Trouble Code: Catalyst Heater Control Circuit
P0429 means that both of the heated oxygen sensors have malfunctioned in some way.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com