Fault Family System: Powertrain (P-Codes) 3 SAE Codes

Alt Fuel Pump Performance

Diagnostic & Technical Explanation

Code P2A8E (Alternative Fuel Pump A Performance) sets when pump A, B, or C is not delivering the fuel volume or pressure the ECM expects for its commanded duty cycle, despite the pump's individual circuits testing fine. A worn pump plunger or check valve, air trapped in the supply line from the tank, or a partially clogged inlet filter are the most common physical causes.

These 3 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 3 times.

Codes in this family (3)

Code	Definition	Repair coverage
P2A8E	Alternative Fuel Pump A Performance	3 ranked fixes
P2A8F	Alternative Fuel Pump B Performance	3 ranked fixes
P2A90	Alternative Fuel Pump C Performance	3 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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