P2A7F code meaning
Alternative Fuel Pump A Compression Stroke Valve Control Circuit/Open
Powertrain system Generic code P2Axx codes Check engine light
What P2A7F means
Hydraulically driven LNG pumps use solenoid valves to admit high-pressure oil to the drive side for the compression stroke and to vent it again for refilling. Caterpillar's patent US10060421B2 gives each of its six pumping elements, other counts being possible, a solenoid pilot that moves a spool between fill and drain positions; the controller sets timing and length of every stroke this way. P2A7F reports that pump A's compression stroke valve has an open or otherwise faulty control circuit. The valve then stays in its spring position and pump A no longer delivers. Which element or tank pump carries the letter A is not published, and neither is P2A7F itself. Check coil resistance and connector first.
P2A7F 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 P2A7F
- Warning lamp on
- Reduced LNG delivery and lower power
- Gas pressure drops under load
Common causes of P2A7F
- Most likelyOpen wire or loose connector at valve A
- PossibleSolenoid coil of valve A burnt open
- Less likelyOutput stage in the control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel pump a compression stroke valveWiring harnessAfcm
What each part of P2A7F 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. |
| 7F | The exact fault in that area. |
What to do next
- Note P2A7F 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 P2A7F
What does P2A7F mean?
P2A7F means "Alternative Fuel Pump A Compression Stroke Valve Control Circuit/Open". Hydraulically driven LNG pumps use solenoid valves to admit high-pressure oil to the drive side for the compression stroke and to vent it again for refilling. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A7F?
Drive gently and only to a workshop. With P2A7F the car can go into limp mode (reduced power) to protect itself.
Will P2A7F fail an emissions test?
Yes, it can. P2A7F 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 P2A7F to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2A7F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.