P2A85 code meaning
Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low
Powertrain system Generic code P2Axx codes Check engine light
What P2A85 means
P2A85 means the drive output for pump B's compression stroke valve reads too low for its commanded state. Typical are a control wire chafed through to the frame, which can keep the solenoid energised even when the controller wants it off, or a coil with shorted windings that draws excessive current. A valve stuck in the fill position leaves pump B's plunger parked at full extension; the pump stops delivering, and pressurised oil remains on its drive side. Caterpillar's six-element example can partly make up for this with the remaining elements, whereas a two-tank system loses the second tank's supply. No manufacturer publishes P2A85. Compare the measured coil resistance with that of an identical A or C valve.
P2A85 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A85
- Warning lamp on
- Pump B delivers nothing, reduced power or range
Common causes of P2A85
- Most likelyControl wire of valve B chafed through to the frame
- PossibleCoil of valve B with shorted windings
- Less likelyOutput stage for valve B shorted
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel pump b compression stroke valveWiring harnessAfcm
What each part of P2A85 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 85 | The exact fault in that area. |
What to do next
- Note P2A85 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2A85
What does P2A85 mean?
P2A85 means "Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low". P2A85 means the drive output for pump B's compression stroke valve reads too low for its commanded state. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A85?
Drive gently and only to a workshop. With P2A85 the car can go into limp mode (reduced power) to protect itself.
Will P2A85 fail an emissions test?
Yes, it can. P2A85 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2A85 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2A85 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.