If the misfire is still present, the ECM will disable the fuel injector again repeating the process. The ECM will then re-enable the fuel injector and, after approximately 200 engine revolutions, will determine if the misfire is still present. When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set, and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s. The Diagnostic Trouble Codes (DTC) P0301 through P0306 (or P0301 through P0308) correspond to cylinders 1 through 6 (or 1 through 8). The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events.Įxtreme cylinder misfire events can cause catalytic converter damage. The Engine Control Module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when an engine cylinder misfire is occurring.
This Factory Service Bulletin explains how this condition may be caused by significant carbon build up on the intake and/or exhaust valves due to fuel contamination or incomplete burning of the fuel.Ģ002 Chevrolet Blazer P0300 Misfire Diagnostics
There are Factory Service Bulletins for the following Chevrolet models:Ģ000-2013Chevrolet Factory Service Bulletin OBDII Code P0300Ĭhevrolet Factory Service Bulletin OBDII Code P0300Ĭhevrolet Factory Service Bulletin OBDII Code P0171Ģ000-2018 Chevrolet Factory Service Bulletin OBDII Code P0300 If the problem persists, more tests need to be done to diagnose the problem, see "Possible Causes". If no leak is found, the next step is to replace the spark plugs. Start by checking for intake leaks intake gaskets are a common cause of multi-cylinder misfiring. The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. What does this mean? |P0300 CHEVROLET code tech notes