P2A71: Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/Performance

What it means

The alternative fuel hydraulic fuel pump select valve control is not behaving as expected.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

The alternative-fuel hydraulic pump select valve controls which pump path or operation is selected, and the module checks whether valve control behaves as expected. P2A71 sets when the control response is outside its expected range or performance, such as when the valve sticks or binds.

Common causes

Most likely first.

1. Select valve sticking or binding
2. Fault in valve wiring or connector

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

How to diagnose it

1. Review freeze-frame data and live valve command or feedback, if available, to identify when the response deviated from expected operation.
2. Inspect the select valve and harness for damage, a loose connector, contamination, or signs that the valve may be binding.
3. Command the select valve with a scan tool, if supported, and note whether its response is delayed, incomplete, or inconsistent.
4. Check the valve circuit wiring and connector terminals for excessive resistance or intermittent connection using the wiring diagram.
5. Test the valve's mechanical movement and electrical operation against the manufacturer's procedure.

Common fixes

• Secure a loose select-valve connector and repair damaged terminals.
• Repair wiring faults or poor connections affecting valve control.
• Replace the select valve if it sticks or fails its functional test.

Can I keep driving?

Avoid high-load driving if the vehicle has long cranking, stalls, or loses power, because valve response may not keep alternative-fuel delivery consistent. Stop driving if it stalls repeatedly or cannot accelerate safely.