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My chevy trail blazer 2002 model has dtc code po300 random misfire.what is d cause pls.

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3 Answers

Gm code po300


This is a misfire code. Start with the basics, fuel filter, spark plugs, vacuum leaks, wires etc. If after checking/changing necessary parts, if problem persists you will need to go deeper as in coils and computer controlled parts such as map sensor, maf sensor

Sep 10, 2014 | 2002 Chevrolet Blazer

1 Answer

2005 chevy equinox what are problem codes po405


405 is EGR sensor circuit a low. 300 is random misfire. An open EGR can cause random misfires.

Aug 31, 2014 | 2005 Chevrolet Equinox

1 Answer

What is PO300 code for a Chevrolet trail blazer


p0300 Indicates "Random, or multiple misfire condition"

Unfortunately there are many things that can cause these misfires. including but not limited to these:

Faulty spark plugs or wires Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages
Faulty camshaft position sensor(s)



For a DIY project (your mileage may vary) I would first pull your spark plugs to see if any of them are badly fouled, burned , broken , or have their electrode arms bent. this could be a simple solution to your problem. Otherwise it may be time to seek the help of a professional, as pinpointing these problems can be a painstaking time consuming endeavor.

Jun 07, 2014 | Cars & Trucks

1 Answer

2005 chevy engine code po300


Diagnostic Test Code (DTC) P0300 has a generic description of "Random Cylinder Misfire". To put it simply, there is more than one cylinder in your engine that has been misfiring. What needs to be done is to (A) determine WHICH cylinders are actually misfiring. This can be done by using a scan tool to view the misfire data and the freeze frame data that is stored in the computer and (B) Perform proper diagnostic procedures to determine the actual CAUSE of the misfire(s).

Misfires can be caused by many things. It could be as simple and painless as worn-out spark plugs that need to be replaced or it could be much more involved and expensive to repair like burned valves or a blown head gasket.

Jan 04, 2012 | Cars & Trucks

2 Answers

My 01 chevy blazer will idle rough. it gives me error codes, p0300 and p0135 and p0141. where do i find these problems


Hello your po135 is o2 sensor bank 1 your po141 is O2 sensor bank 1 sensor 2 and your pO300 is random multiple cylinder misfire these problems are your oxygen sensors and engine misfire pO300 is you engine missing o2 sensors are switches in the exhaust system the engine misfires are the engines cylinders missing.

Jan 05, 2011 | 2001 Chevrolet Blazer

1 Answer

2003 1500hd chevy silverado 6.0 liter. I had a



DTC Number
P0160 DTC Name O2 Sensor Circuit No Activity Detected Bank 2 Sensor DTC Number P0300 DTC Name Random/Multiple Cylinder Misfire Detected

Feb 17, 2010 | 2003 Chevrolet Silverado 1500

2 Answers

97 toy corolla DTC po300 po301 po401 po402


po300 random/multiple cylinder misfire detected po301 cylinder 1misfire detected po401egr flow insufficient po 402egr flow excessive

Feb 11, 2010 | 1997 Toyota Corolla

1 Answer

Po128,po155,po171,po300 These are the things that faile on my 2002 chevy blazer when I took it to the Maryland state emmissions test. Do you know what they are?


P0128 (Coolant thermostat-coolant temp below thermostat regulating temperature) Possible cause-Mechanical fault

P0155 (Heated oxygen sensor (H)2S)1, bank 2,-circuit malfunction) Possible cause Wiring, H02S, ECM

P0171 (System to lean, ban 1) possible cause intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), H02S

P0300 (Random/multiple cylinder(s)-misfire detected) Possible causes Spark plug(s), HT lead(s), injector(s), ignition coil(s), low compression, or wiring.

Sep 05, 2009 | 2002 Chevrolet Blazer

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