System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Alt Fuel Hydraulic Valve Control
Code P2A71: Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/Performance
Diagnostic & Technical Explanation
Code P2A71 (Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/Performance) applies to bi-fuel systems that use a hydraulically actuated fuel pump select valve to route liquid alternative fuel to the injection pump. The ECM detects an open circuit, an out-of-range voltage, or a valve that fails to reach its commanded position within the expected hydraulic response window. Contamination in the hydraulic fluid fouling the valve spool, a failed solenoid coil, or damaged control wiring are the usual causes.
First-listed procedure
Rank #1
Inspect hydraulic fluid condition and top off reservoir
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: Alt Fuel Hydraulic Valve Control
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)