P2A41 code meaning
Alternative Fuel Tank B Pressure Sensor Circuit
Powertrain system Generic code P2Axx codes Check engine light
What P2A41 means
Some multi-tank CNG installations give a second cylinder, tank B, its own pressure transducer, so the module knows the remaining gas per tank and can check that the tank valve responds. P2A41 is the general electrical fault of that sensor, set when the circuit is faulty without a clear verdict of low or high. Publications only describe the single sensor of tank A: on Ford's 2003 bi-fuel CNG trucks it is built into the regulator and drives the gauge, which the AFCM forces to empty when the sensor fails. The upfitter TransEco substitutes a fixed 3600 psi and keeps running. No manufacturer lists P2A41. Check the 5 V feed, signal and ground at the tank B sensor plug first; P2A43 and P2A44 separate the low and high cases, P2A45 brief dropouts.
P2A41 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 P2A41
- Check engine light
- Gas gauge wrong or showing empty
- Tank B possibly no longer used
Common causes of P2A41
- Most likelyPlug at the tank B sensor loose, corroded or harness damaged
- PossibleTank B pressure sensor faulty
- Possible5 V reference or sensor ground 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 pressure sensorWiring harnessAfcm
What each part of P2A41 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. |
| 41 | The exact fault in that area. |
What to do next
- Note P2A41 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 P2A41
What does P2A41 mean?
P2A41 means "Alternative Fuel Tank B Pressure Sensor Circuit". Some multi-tank CNG installations give a second cylinder, tank B, its own pressure transducer, so the module knows the remaining gas per tank and can check that the tank valve responds. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A41?
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 P2A41 fail an emissions test?
Yes, it can. P2A41 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 P2A41 to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P2A41 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.