Question about 2004 Dodge Ram 1500

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4.7l V-8---error code P0308 is being displayed---about a year ago, I replaced the plugs and all 8 coil packs---thanks

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Hi. This P0308 code means that the the PCM has detected that one of the engine's cylinders are not firing properly. In this case it will be cylinder Number 8.

A code P0308 may indicate that one or more of the following has occurred:

1 Faulty spark plug or wire
2 Faulty coil (pack)
3 Faulty oxygen sensor(s)
4 Faulty fuel injector
5 Burned exhaust valve
6 Faulty catalytic converter(s)
7 Running out of fuel
8 Poor compression
9 Defective computer

If there are no symptoms, the first thing to do is to reset the code, with a code reader, and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the affected cylinder and plug/coil assembly. Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs-COP-). In some cases, the catalytic converter has collapsed. If you smell rotten eggs in the exhaust, your converter may need to be replaced. I've also been told several times that the problem in this case could be a faulty injector at that cylinder 8.

Posted on Sep 04, 2010

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Replace coil packs on the ford explorer 2006


What codes P0304 & P0308 ? This just means the PCM detected a misfire on those cylinders .an could be a few different things !
What ignition type does your vehicle have coil on plug or a coil pack with 8 plug wire towers ? If you have coil on plug ignition there are two wires going to the coils , one has battery + an the other is control from PCM . Check power first with volt meter or test light . Or use a spark tester on those two cylinders . No Spark Testing control testing

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Why am I getting code # P 0308


I have your vehicle as a 97 Ford Expedition...Is this correct? Reason I ask is that Ford uses Coil-On-Plug and you said "I changed the wires"...Which would mean all eight coils were changed...P0308 is telling you the ECM is seeing a fault on cylinder #8...I would strongly suspect a bad coil for that cylinder...Question; Did you change all eight coils? If not change #8...saailer

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1996 Lincoln Mark VIII has engine misfire on number 8 cylinder


THis is the same that P0308 fault code when "check engine" light turn on. A P0308 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #8.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present


A code P0308 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day

Dec 19, 2011 | 1996 Lincoln Mark VIII

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I GOT A 99 DODGE DURANGO 5.9 4 WHEEL DRIVE I GOT A CODE P0308 REPLACED PLUGS / ROTOR COIL JUST LAST YEAR. I ALSO NOTICED OIL ON THE PLUG WHEN I TOOK IT OUT. WHAT DO I DO TO FIX IT


did you do a compression test? also check to make sure the fuel injector is working. you can also take a vacuum guage and connect it to the intake manifold while the engine is running to see if the readings are very erratic. if they are it could indicate a broken valve spring on the no. 8 cylinder.

Jul 28, 2011 | Dodge Durango Cars & Trucks

1 Answer

Engine light comes on code 308


P0308 is cylinder misfire detected, cylinder #8. Causes can be: bad spark plug, bad coil pack, faulty fuel injector, poor compression, faulty computer..I generaly recommend changing spark plugs first. Then test the coil pack, after that I would look at the injector, I have never seen a bad computer throw this code.

Jul 27, 2011 | 2004 Ford F150

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308 code i change sparks ignition coil same problem


Code P0308 - Cylinder 8 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #8
- Insufficient compression at cylinder #8
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #8
- Fuel injector #8 may be faulty

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #8
- Replaced Injector #8
- Replaced Ignition Coil #8

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Po308 code misfire #8 cylinder. How to fix? replace ignition module first? spark plugs were just done and seem fine.


Seems you may have answered your own question.

P0308 will normally be a coil failure but can also be a compression fault caused by a sticky lifter etc or a faulty, incorrectly gapped spark plug

It most likely be the coil but check the spark plug and run a compression test if you have the equipment, all bores should have equal PSi readings.

Or you could try moving the coil in cyl. 8 to see if the code moves to a different P030* code

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2 Answers

Code p0308


It's detected a Misfire in Cylinder # 8
Any of the following could cause a misfire:
faulty spark plug or wire
faulty coil
faulty fuel injector
poor compression
defective computer


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check ignition coil pack with the truck running used
a spray bottle with water spray on coil pack if truck
stall you have a weak coil

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