What it means
The alternative fuel pump A compression stroke 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 pump A compression stroke valve helps control pump operation during the compression stroke. The control module sets P2A80 when the valve control does not respond as expected, which can result from a sticking or binding valve or a fault in its wiring or connector.
Common causes
Most likely first.
- Compression stroke valve sticking or binding
- 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
- Save freeze-frame data and review related pump codes to identify whether the control problem occurs during starting, changing load, or higher engine speed.
- Inspect pump A's compression stroke valve connector and harness for looseness, corrosion, chafing, or damaged insulation.
- Check the valve control circuit for continuity and unwanted shorts using the wiring diagram.
- Test the valve coil and observe its response using the manufacturer's diagnostic procedure and specifications.
- If the electrical circuit passes, check whether the compression stroke valve sticks or binds and replace or repair it as indicated by the manufacturer's procedure.
Common fixes
- Secure or repair a loose or damaged valve connector.
- Repair damaged wiring in pump A's compression stroke valve control circuit.
- Replace the compression stroke valve if it sticks or binds and cannot be corrected.
- Replace the valve if it fails the manufacturer's electrical tests.
Can I keep driving?
The pump may not build or control pressure properly, causing long cranking, stalling, or power loss under load. Avoid heavy-load driving and stop safely if the engine stalls or cannot maintain power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.