P2A5F code meaning
Alternative Fuel Tank B Level Sensor Circuit
Powertrain system Generic code P2Axx codes Check engine light
What P2A5F means
How the content of a second gas tank is measured depends on the fuel. CNG has no liquid surface, so the level is worked out from pressure, often corrected by tank temperature; GM's 2015 Impala Bi-Fuel shows full near 3,600 psi and empty near 400 psi. LPG, being liquid, allows a float whose magnet passes its position through the tank wall to a Hall element, as in Rochester's R3D dials. P2A5F is the general circuit fault of such a sender on tank B, without a low or high finding. No manufacturer documents P2A5F. Roush's propane trucks with two tanks use the gasoline codes P2067 and P2068 for the second sender instead, and the gauge then shows only the primary tank. Start with plug, wiring and supply of the tank B sender.
P2A5F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A5F
- Check engine light
- Gauge ignores the content of tank B
- Range estimate on gas too low
Common causes of P2A5F
- Most likelyPlug or wiring of the tank B sender faulty
- PossibleTank B level sender or Hall module defective
- Less likelyReading module or data link to the engine module disturbed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel tank b level sensorWiring harnessAfcm
What each part of P2A5F 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. |
| 5F | The exact fault in that area. |
What to do next
- Note P2A5F 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 P2A5F
What does P2A5F mean?
P2A5F means "Alternative Fuel Tank B Level Sensor Circuit". How the content of a second gas tank is measured depends on the fuel. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A5F?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2A5F fail an emissions test?
Yes, it can. P2A5F 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 P2A5F to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2A5F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.