P2A49 code meaning
Alternative Fuel Tank C Pressure Sensor Circuit High
Powertrain system Generic code P2Axx codes Check engine light
What P2A49 means
P2A49 is the mirror image of P2A48: the tank C pressure signal sits above the band a healthy sensor uses, so the module rejects it. In TransEco's AFCM table the tank A equivalent traces back to a sensor with an open circuit or a short to the supply. An open ground is a classic trigger too, because the input is then pulled toward its supply rail. The practical danger is a cylinder that seems full when it is not; the gauge stays high and the system may count on gas from tank C until the engine starts to falter on a near-empty supply. No manufacturer lists P2A49 publicly. With the system depressurised and the plug off, check whether the voltage at the module side still reads high; if so, the fault lies in the harness rather than the sensor.
P2A49 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A49
- Check engine light
- Gauge for tank C stays at full
- Hesitation once tank C really runs low
Common causes of P2A49
- Most likelyGround or signal wire of the tank C sensor interrupted
- PossibleSignal shorted to 5 V or battery voltage
- PossibleTank C sensor open internally
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel tank c pressure sensorWiring harnessAfcm
What each part of P2A49 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. |
| 49 | The exact fault in that area. |
What to do next
- Note P2A49 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 P2A49
What does P2A49 mean?
P2A49 means "Alternative Fuel Tank C Pressure Sensor Circuit High". P2A49 is the mirror image of P2A48: the tank C pressure signal sits above the band a healthy sensor uses, so the module rejects it. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A49?
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 P2A49 fail an emissions test?
Yes, it can. P2A49 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 P2A49 to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P2A49 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.