All codes › P0300

P0300 — Random or Multiple Cylinder Misfire

P0300 is set when the engine control module's misfire monitor detects that combustion is failing in more than one cylinder, or that misfires are occurring randomly across cylinders rather than being isolated to a single one. The misfire monitor works by measuring tiny variations in crankshaft rotational speed — a missed combustion event causes the crankshaft to decelerate by a detectable amount. When the ECM cannot attribute the event to a single cylinder, it sets P0300.

Pick your vehicle for a P0300 diagnosis

Select your exact year, make, and model below to get a diagnostic guide tuned to your vehicle's known failure patterns and TSBs.