Fault Family System: Powertrain (P-Codes) 4 SAE Codes

Misfire Random Multiple

Diagnostic & Technical Explanation

Code P0300 (Random/Multiple Cylinder Misfire Detected) sets when the ECM's crankshaft-acceleration misfire monitor counts combustion events across multiple cylinders (or an undifferentiated pattern) beyond the calibrated threshold, including variants triggered by a low fuel level, a cold-start window, or a commanded fuel cutoff. Because no single cylinder is isolated, the cause is almost always something that affects the whole engine at once: a vacuum leak, worn spark plugs across the set, a weak fuel pump/low fuel level, or a base ignition timing/reluctor fault.

These 4 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P0300	Random/Multiple Cylinder Misfire Detected	4 ranked fixes
P0313	Misfire Detected With Low Fuel	4 ranked fixes
P0316	Engine Misfire Detected on Startup (First 1000 Revolutions)	4 ranked fixes
P0363	Misfire Detected - Fueling Disabled	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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