P2A71
Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/Performance
The control circuit of the alternative fuel hydraulic fuel pump select valve reports a control range/performance condition. Pump path selection cannot be commanded reliably.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Common causes
Ordered by how often each turns out to be the cause.
- Valve responds slower than expectedCommon
- High-resistance contact in connectorPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Alt Fuel Hyd Pump Select Valve
- Wiring Harness
- Afcm
P2A71 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.