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It give me codes po72 and po300 - 2004 Chevrolet Impala

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97 olds cutlass. Car shuts off randomly, turn it back on and now it has really rough idle, sputters when accelerate and gives off fume smell. Got a po300 code, spark plugs were a no fix. Any ideas


I don't know what a po300 code is but, I would get the Electronic Control Unit checked out. If it is the computer check out all your options: you can buy ECUs on the internet for less than a quarter of what dealers might charge you, also google or youtube, how to change out my ECU, it's usually quick and easy if you have a little skill and a few cheap and common tools.

Sep 24, 2015 | Cars & Trucks

1 Answer

Innova 3030 shows a code PO300


PO300 is a random misfire code. Generally, a coil needs to be replaced. The DIM in your car should specify which one. (My 2000 S80 did). Easy to change.

Mar 17, 2015 | 2000 Volvo S80

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

Rough running


Have to diagnose the PO300 multiple misfire code
can't go by last time or guess at it

Could be a vacuum leak at intake manifold
Could be ignition issues
Could be injector issues
Egr System
Coolant Sensor
& on & on

Dec 13, 2012 | 1996 Chevrolet Astro

1 Answer

Po300 code multi cyl misfire any sugg


The code you got may not have indicated the correct coil, that was bad

I would put the old coil back in #6 & either walk the new coil to another cylinder, or get professonal help in the form of a scan tool in Mode $06,
if applicable on your vehicle & check for misfires that why

Forget the PO300

Jul 30, 2012 | 2004 Chevrolet TrailBlazer

1 Answer

1996 olds cutlas supreme, 3.1 L has trouble codes PO171 and PO300. Any Ideas?


The po300 is a misfire code.This means there is probably a plug,plug wire,ignition coil,or ignition module.Check the coil towers one at a time.These are know for corroding.If you find one that is corroded then replace the plug wire also.Po171 is a lean condition code.The po300 could be causing the po171.If you have not had a tune up Now would be a good time.Hope this helps.Good luck.

Jan 06, 2010 | 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

PO300 code on 2004 Chevy 2500hd


Hi Frank, Give me a call, 866-718-1234 ext 158.

Apr 21, 2009 | 1999 Chevrolet C2500

1 Answer

1996 monte carlo fault codes po300, 441, 705,


THESE ARE FROM THE GM CODE DIFINITION MANUAL, U NEED TO TAKE THIS TO THE DELAER, U HAVE SOME SERIOUS PROBLEMS TO GIVE THIS MANY CODES.

P0300 - Engine Random Misfire Detected
P0441 - Evaporative Emission Control System Incorrect Purge Flow
P0705 - Trans Range Switch Circuit
P1106 - Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
P1441 - Evaporative Emission (EVAP) System Flow During Non-Purge
P1662 - Cruise Lamp Control Circuit
P1672 - Low Engine Oil Level Lamp Control Circuit
P1870 - Transmission Component Slipping

Mar 24, 2009 | 1996 Chevrolet Monte Carlo

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