Barometric Pressure Sensor Circuit Low
The barometric (ambient) pressure sensor reports a voltage below the valid window. The ECU uses this signal to compensate fuel and boost calculations for altitude — a stuck-low value tricks the ECU into thinking the car is at high altitude.
Affected components
- Barometric pressure sensor
- Bps wiring
Common causes
- High likelihood: Barometric pressure sensor failed
- Medium likelihood: Signal shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.