Fault Family System: Powertrain (P-Codes) 10 SAE Codes

Alt Fuel Misfire Detected

Diagnostic & Technical Explanation

Code P2E58 (Alternative Fuel Random/Multiple Cylinder Misfire Detected) sets when the ECM's misfire monitor detects a combustion event failure specific to alternative-fuel operation, on a single cylinder, multiple/random cylinders, or under a low-fuel condition. Because CNG/LPG burns differently than gasoline, a misfire that only appears on alternative fuel usually traces to a fouled or worn spark plug that cannot ignite the leaner mixture, an injector delivering too little vapor, or fuel pressure sagging as the tank runs low.

These 10 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 10 times.

Codes in this family (10)

Code	Definition	Repair coverage
P2E58	Alternative Fuel Random/Multiple Cylinder Misfire Detected	4 ranked fixes
P2E59	Cylinder 1 Alternative Fuel Misfire Detected	4 ranked fixes
P2E5A	Cylinder 2 Alternative Fuel Misfire Detected	4 ranked fixes
P2E5B	Cylinder 3 Alternative Fuel Misfire Detected	4 ranked fixes
P2E5C	Cylinder 4 Alternative Fuel Misfire Detected	4 ranked fixes
P2E5D	Cylinder 5 Alternative Fuel Misfire Detected	4 ranked fixes
P2E5E	Cylinder 6 Alternative Fuel Misfire Detected	4 ranked fixes
P2E5F	Cylinder 7 Alternative Fuel Misfire Detected	4 ranked fixes
P2E60	Cylinder 8 Alternative Fuel Misfire Detected	4 ranked fixes
P2E61	Alternative Fuel Misfire Detected With Low Fuel	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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