P2431 code meaning
AIR System Air Flow/Pressure Sensor Circuit Range/Performance (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P2431 means
P2431 flags a bank 1 secondary air pressure signal that can be read but makes no sense. The usual check compares the sensor with barometric pressure: with the pump off both should agree, with the pump running the rise must stay within limits. GM sets the code on the 3.8L V6 (2005–2006) when the gap exceeds 10 kPa with the pump off or 50 kPa with it on for over 30 s, Type B; the 2018 table works with 15 kPa and 50 kPa. Volkswagen's 2014 Beetle 1.8 TSI allows a deviation of up to 60 hPa from ambient pressure, the Golf CBFA engine only 25 hPa. GM bulletin PIP4409E links P2431 on Colorado, Canyon and H3 to broken MAP sensor wires, because the comparison relies on a correct baro value. Pure circuit faults go under P2432/P2433.
P2431 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2431
- Check engine lamp, often only after cold starts
- Secondary air monitor not completed
- Possibly further MAP or lean codes if the reference is wrong
Common causes of P2431
- Most likelyPressure sensor drifted or reacts too slowly
- PossibleWrong barometric reference, e.g. damaged MAP sensor wiring
- PossibleRestricted or leaking air duct around the sensor port
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Air system flow sensor b1Sai wiring
What each part of P2431 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 31 | The exact fault in that area. |
What to do next
- Note P2431 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 P2431
What does P2431 mean?
P2431 means "AIR System Air Flow/Pressure Sensor Circuit Range/Performance (Bank 1)". P2431 flags a bank 1 secondary air pressure signal that can be read but makes no sense. It is a generic code, so it means the same on every make.
Is it safe to drive with P2431?
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 P2431 fail an emissions test?
Yes, it can. P2431 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 P2431 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2431 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.