P0311 OBD-II Trouble Code: Cylinder 11 Misfire Detected

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0311 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0311 code

P0311 is a diagnostic trouble code (DTC) for "Cylinder 11 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 $69.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$69.99$20.00
Toyota$69.99$20.00
BMW$69.99$20.00
SCHEDULE P0311 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light

P0311 code definition

A P0311 code is stored when the powertrain control module (PCM) detects a misfire in cylinder 11 in the engine. When this happens, the Check Engine Light or MIL (Malfunction Indicator Light) will illuminate and will remain illuminated until the problem is resolved.

What the P0311 code means

A misfire in a vehicle’s engine is a simple lack of combustion, which has a number of potential causes. The P0311 code is a means for the PCM to store the fact that Cylinder 11 misfired. With this code, a mechanic can determine the cause and proper repair(s) for the problem so that the cylinder does not continue to misfire in the future.

What causes the P0311 code?

Because the P0311 code is specific to cylinder 11, all causes and repairs will be in relation to this cylinder. Some of the problems that cylinder 11 and its components may be having include:

  • A faulty spark plug
  • An open or shorted fuel injector
  • A clogged or defective fuel injector
  • A faulty ignition coil
  • A poor electrical connection to the fuel injector
  • An open or shorted ignition coil harness
  • Insufficient pressure in the cylinder
  • Incorrect fuel pressure
  • A leak of intake air

What are the symptoms of the P0311 code?

A misfiring cylinder will not cause a lot of symptoms, but you may notice that the vehicle vibrates at idle as it misfires. The fuel efficiency can also suffer, as can the car’s performance on the road. The one constant symptom, of course, will be the illuminated Check Engine light or MIL.

How does a mechanic diagnose the P0311 code?

After using an OBD-II scanner to detect the P0311 code, a mechanic will know which cylinder is misfiring and can then take steps to diagnose the problem. One of the first diagnostic steps to take is to switch ignition components between cylinder 11 and one of the good cylinders. After switching the components, the mechanic will clear the code and operate the vehicle again to see if the misfire code moves to the new cylinder. If this is the case, then one or more of the components is the problem and should be repaired or replaced.

If switching components leads to the same P0311 code, then the problem could be a compression issue. The most likely causes for this include problems with the exhaust valves or leaks in the head gasket. The mechanic will look for coolant leaks or an overheating engine as potential indicators of a head gasket problem.

Common mistakes when diagnosing the P0311 code

Assuming that cylinder 11’s ignition components are the problem and replacing them before testing them with a good cylinder is a common problem. While these components are the most likely cause of the problem, it’s best to do a thorough diagnosis and determine exactly what the problem is before jumping to any (potentially expensive) conclusions.

How serious is the P0311 code?

In some cases, a P0311 code will not be very serious and will only be noticeable because of the illuminated Check Engine Light and a discernible vibration when idling. However, if left alone, a problem in a single cylinder can become a much larger issue. That’s why it’s important to get your vehicle checked out and get the right repairs done as soon as possible.

What repairs can fix the P0311 code?

In most cases, a misfiring cylinder can be fixed by replacing some or all of its ignition components, including:

If the problem is not caused by the ignition components, it can likely be fixed by repairing or replacing a leaking head gasket or exhaust valve.

Additional comments for consideration regarding the P0311 code

If the misfiring in cylinder 11 doesn’t seem to be affecting your vehicle’s performance, you may be tempted to let this code go. However, remember that a vehicle cannot pass OBD-II emissions tests if the Check Engine Light or MIL is illuminated.

Need help with a P0311 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.

trouble codes
Check Engine Light
P0311

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0311 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,240

Rating Summary
3,884
174
45
26
111
3,884
174
45
26
111
Michael

Michael

45 years of experience
75 reviews
Michael
45 years of experience
Great
2002 KIA OPTIMA - CHECK ENGINE LIGHT IS ON - MEMPHIS, TENNESSEE
Raymundo

Raymundo

4 years of experience
17 reviews
Raymundo
4 years of experience
Great Guy!! He was on time and honest. I love how he checks thing thoroughly and did them more than once to make sure he had the right source of the problem.
2011 BMW 528I - CHECK ENGINE LIGHT IS ON - DALLAS, TEXAS
Logan

Logan

46 years of experience
81 reviews
Logan
46 years of experience
WOW!!! I loved the experience of having a mechanic come to my home. He arrived promptly, introduced himself and got right to work. He took his time to explain what he was doing, and answered all my questions. I was so surprised when he told me the repairs were still under warranty (my car is 7 years old/67,000 miles), Wow, now that is a honest mechanic!!!! :) I highly recommend "Your Mechanic". Patty/Tracy, CA 2007 Mercedes Benz "check engine light"
2007 MERCEDES-BENZ C230 - CHECK ENGINE LIGHT IS ON - TRACY, CALIFORNIA
Charles

Charles

31 years of experience
227 reviews
Charles
31 years of experience
Great guy, very prompt and professional!! Thank you very much, Sir!
2003 FORD RANGER - CHECK ENGINE LIGHT IS ON - AUSTIN, TEXAS

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: My van won't start.. it's not the battery or the starter they are both brand new and I also had the starter relay changed ..

Hello and thank you for contacting YourMechanic. The code P1684 is for a battery disconnect from the battery to the computer system. The corrosion on the battery cable will block electrical current from traveling from the battery to the computer....

Q: Car starts, but quits; removing/replacing battery cable helps

Hello there, thank you for asking about your 2002 Chrysler Intrepid. You're correct in that a transmission mechanical problem would not come and go by simply disconnecting the battery. My guess is that the transmission shift solenoid pack has failed....

Q: Car stalls out of nowhere

Hello - what a frustrating problem to solve! You may have provided a key clue to the solution, given that it requires another vehicle to jump start it to get it going again. This MAY mean that the increased starting...

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.

1-800-701-6230 · hi@yourmechanic.com