OBD-II code · Powertrain (generic, extended)
P2A85 Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low
The control circuit of the compression stroke valve in alternative fuel pump B reports a control circuit low condition. Pump compression stroke cannot be commanded as expected.
Is it safe to drive with P2A85?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to ground
- PossibleInternal short in valve coil
- Less likelyConnector pins corroded - high contact resistance
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
- P2A81Alternative Fuel Pump A Compression Stroke Valve Control Circuit Low
- P2A89Alternative Fuel Pump C 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
- P2A84Alternative Fuel Pump B Compression Stroke Valve Control Circuit Range/Performance
- P2A86Alternative Fuel Pump B Compression Stroke Valve Control Circuit High
- P2A87Alternative Fuel Pump C Compression Stroke Valve Control Circuit/Open
- P2A88Alternative Fuel Pump C Compression Stroke Valve Control Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.