Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161208-83728-10dwamyjs:136:3912)
    at m.mountComponent (/tmp/execjs20161208-83728-10dwamyjs:47:15602)
    at /tmp/execjs20161208-83728-10dwamyjs:49:31860
    at a.r.perform (/tmp/execjs20161208-83728-10dwamyjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161208-83728-10dwamyjs:49:31821)
    at r (/tmp/execjs20161208-83728-10dwamyjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161208-83728-10dwamyjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161208-83728-10dwamyjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161208-83728-10dwamyjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161208-83728-10dwamyjs:173:8

P0308 OBD-II Trouble Code: Cylinder 8 Misfire Detected

check engine light

P0308 Code Definition

Cylinder 8 Misfire Detected

What the P0308 code means

The P0308 trouble code means that the powertrain control module (PCM) has detected an issue with the ignition of the fuel being provided to cylinder 8. This must usually happen multiple times before a trouble code is stored and the Check Engine Light is illuminated.

What are the causes of the P0308 code?

Some potential causes of the P0308 trouble code would include:

  • Faulty ignition parts such as the spark plugs, ignition coils, spark plug boots and wires, or distributors

  • Faulty fuel system parts such as the fuel pressure regulator, fuel injectors, or the EGR valve

  • A large vacuum leak

  • A faulty powertrain control module

What are the symptoms of the P0308 code?

Some symptoms of the P0308 trouble code that the driver may experience would include:

  • Rough idle
  • Hesitation
  • Loss of power
  • Engine may die
  • Engine may not start
  • Decreased fuel economy

How does a mechanic diagnose the P0308 code?

The first thing a mechanic is likely to do when diagnosing a P0308 code is check the ignition system. If anything is visually wrong with the ignition system, such as something unplugged or broken, this issue would need to be resolved before any further diagnosis could take place.

If nothing is visually wrong with the ignition system, the mechanic would then test each spark plug and wire with an ignition tester to ensure that each plug is firing. If any issues is found during this test, they must be resolved before any further diagnosis can occur.

If no issues with the ignition system exist, the fuel system is the next stop for the mechanic. A fuel pressure test is likely to be performed to make sure that the fuel pressure regulator is functioning properly. Running data on the fuel injectors with an OBD-II scanner is another likely test the mechanic would perform on the fuel system. Any issues found with the fuel system are recommended to be repaired as soon as possible due to the fact that fuel is dangerous. A vacuum test may also be performed around the same time as the fuel pressure test to ensure the engine is producing sufficient vacuum.

If no issues are found with either of the previous two systems, the next step the mechanic would take is to use a high tech scan tool to test the powertrain control module for proper function. Any faulty parts found during this diagnosis would be replaced at the customer’s request.

Common mistakes when diagnosing the P0308 code

Easily the most common mistake when diagnosing a misfire code of any kind is replacing the spark plugs or doing a “tune up.” This procedure usually only has a 50/50 shot of repairing the problem without conducting proper diagnosis. Although spark plug failure is one of the top causes of a misfire, it is very important to assess every aspect of the problem before replacing any parts to avoid wasted time and money.

How serious is the P0308 code?

The P0308 code is a serious issue. This code being stored in a vehicle’s powertrain control module can prevent the engine from running well. It is important to many people’s daily lives that their vehicle performs properly and is able to get them from one place to another. This type of trouble code is one that could potentially leave a driver stranded on the side of the road. It is a good idea to find the root cause of the misfire and have it repaired as soon as possible.

What repairs can fix the P0308 code?

Repairs that can fix the P0308 code would include:

Additional comments regarding the P0308 code

A variety of things can cause a misfire. With this in mind, it is important to check for any and all possibilities before replacing parts. Most of the time a misdiagnosis will result from not taking the time to fully inspect and test every part of the system that has the issue.

Need help with a P0308 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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: Had p0715 code replaced input speed sensor cut engine light off but in 2 mile it still threw code p0715 again

Hi. There could be a problem internally were the speed sensor is reading making it still throw the code. There also could be a problem with the wiring harness or connector going to the speed sensors. The wiring could have...

Q: Car stalling when stopped

The codes all reference engine misfires. Continued misfires can cause the catalyst to fail and block the exhaust. The past diagnosis you had that the coils could be bad was correct. The coils and plugs should be replaced first and...

Q: Bad Ignition/electrical issue - takes several cranks before it starts!

Hello there, you have a few different faults going on with your 2007 Chevrolet Impala. A vehicle should not have to crank long before it starts unless there is a fault. Given the codes you have listed there are a...