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DTC's:P0301- P0306, besides the coil packs and plugs, what else can I check to resolve this problem? What can cause these DTC's to come up on scanner?

I have changed the motor/transmission mounts, radiator cap, reservoirover-flow tank and flushed the cooling system. Also an oil change in the past month. The check engine light came on about 2 weeks ago so I used the OBDII scanner on my car. These DTC's came on the scanner along with 2 other codes, P0300 and P1399. I need some advice for these problems. Any would be appreciated. If I had any money, I would just take it to the dealer or a shop and have them deal with this but I don't. My car has 198000 miles. My car has an automatic transmission.

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If you have confirmed spark, air and fuel, for the P0301-P0306 codes I would check compression. Also check the attached link. P1399 Honda Random Cylinder Misfire Detected

Posted on Apr 16, 2017

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Could OBD2 codes: P0301- P0306(misfires), come up on the scanner due to anything on the cooling system?


If the coolant system were restricted and not cooling enough it could over heat and misfire . A head gasket leak and coolant fouling the plugs could cause misfire .

Apr 12, 2017 | Cars & Trucks

1 Answer

2006 grand prix gxp 5.3. When you are driving normally it will miss from 50mph and up. When you punch it it doesn't miss a beat. I cleaned the maf sensor and air filter, Plugs were replaced.


It's probably a coil breaking down , have a scan tool hooked up an have misfires checked to see which cylinder is missing .
Ignition Coils
Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.
Drive it long enough like that (with it misfiring ) the check engine light will flash . This is to warn that a catalytic converter damaging event is taking place . This would also set a DTC - diagnostic trouble code
DTC Descriptors ?€¢
DTC P0300 Engine Misfire Detected


?€¢
DTC P0301 Cylinder 1 Misfire Detected


?€¢
DTC P0302 Cylinder 2 Misfire Detected


?€¢
DTC P0303 Cylinder 3 Misfire Detected


?€¢
DTC P0304 Cylinder 4 Misfire Detected


?€¢
DTC P0305 Cylinder 5 Misfire Detected


?€¢
DTC P0306 Cylinder 6 Misfire Detected


?€¢
DTC P0307 Cylinder 7 Misfire Detected


?€¢
DTC P0308 Cylinder 8 Misfire Detected

Apr 26, 2016 | Cars & Trucks

2 Answers

Missfire cyl 1 An 4


Replace the coil pack.

May 28, 2015 | 2005 Chevrolet Aveo

1 Answer

Why is the check engine light on?


Cylinder #1 misfire. Check the Engine control module, sparl plugs and wires and the coil packs too.

Oct 06, 2014 | 1997 Buick Regal

1 Answer

I have a 2002 Jaguar X-type. The check engine light came on and it has been acting jumpy/shaky. I recently took it to be diagnosed and the codes I recieved back were P1314, P1316, P1111, and P0302..What do...


All fault codes can be checked out at http://www.bluejag.co.uk but here are the results for some of yours. You can ignor P1111. Looks like a faulty plug or coil pack cylinder 2

Fault Code:- P1314 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire rate catalyst damage -bank 2 NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- ECM Default:- Maximum engine speed reduced


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure
Fault Code:- P1316 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire excess emission NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure

Fault Code:-
P0302 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire detected ?€" cylinder 2

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Refer to P0300 Possible Causes

Aug 25, 2011 | 2002 Jaguar X-Type

1 Answer

I got several error codes on my 07 Toyota Avalon, codes P0352,P0300 and P0301-P0306. Does any one one know what could be causing it or how to repair it.


p0352
Ignition coil B primary or secondary circuit malfunction
p0300
Random/multiple cylinder misfire detected
p03001
cylinder no.1 misfire detected
p0306
cylinder no.6 misfire detected
check you coils and spark plugs
make sure they are in good shape. check you spark plug wires also.

Aug 26, 2010 | 2007 Toyota Avalon

1 Answer

03 windstar misses and sputters when it rains,eng lite flashes then stays off 4 a while.then goes off. when dry out it runs great.is it the coil pack


Could possibly be the coil pack has a crack in it, could also be plug wires have cracks in them as well, sounds like time for a tune up. Recommend replacing plugs and wires, and if that doesn't solve the issue then spring for the coil pack. Scanning the computer will tell you what code you have to help point you in the right direction as well. If you have any p0300-p0306 codes those are all misfire codes.p0300 is random multiple misfire, p0301-p0306 are individual cylinder misfires.

Mar 18, 2010 | 2003 Ford Windstar

4 Answers

I have a ford explorer 99 but it's giving a error code PO306 what do u think it is


It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.

Feb 17, 2010 | 1999 Ford Explorer

1 Answer

2000 Jeep GCL 4.0L


Try changing spark plug wires and have the fuel pump checked out and check fuel filters and fuel line to see if that is your problem.

Sep 16, 2009 | 2004 Jeep Grand Cherokee

3 Answers

Misfire in Cylinder 1,2,3,5,6 of my 2000 Acura Tl


you may have a faulty crankshaft position sensor this is what controls the firing of the plugs. you may also have corrosion on the plug for the coil pack causing multiple misfires

May 17, 2009 | 2000 Acura TL

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