OBD-II code · Powertrain (generic, extended)
P2A84 Alternative Fuel Pump B Compression Stroke Valve Control Circuit Range/Performance
The control circuit of the compression stroke valve in alternative fuel pump B reports a control circuit range/performance condition. Pump compression stroke cannot be commanded as expected.
Is it safe to drive with P2A84?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyValve responds slower than expected
- PossibleHigh-resistance contact in connector
- Less likelySensor element aged beyond calibration window
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–6 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Pump B Compression Stroke Valve, Wiring Harness, Afcm
Related codes
- P2A80Alternative Fuel Pump A Compression Stroke Valve Control Circuit Range/Performance
- P2A88Alternative Fuel Pump C Compression Stroke Valve Control Circuit Range/Performance
- P2A81Alternative Fuel Pump A Compression Stroke Valve Control Circuit Low
- P2A82Alternative Fuel Pump A Compression Stroke Valve Control Circuit High
- P2A83Alternative Fuel Pump B Compression Stroke Valve Control Circuit/Open
- P2A85Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low
- P2A86Alternative Fuel Pump B Compression Stroke Valve Control Circuit High
- P2A87Alternative Fuel Pump C Compression Stroke Valve Control Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.