Advanced Diagnostics

Advanced Diagnostics

DTC P2227: Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem











General Description
This turbocharged engine is equipped with three absolute pressure sensors.

Normal operating conditions:
(A) When the barometric pressure (BARO) sensor value and the turbocharger boost sensor value are the same when there is no boost.
(B) When the turbocharger boost sensor value and the manifold absolute pressure (MAP) sensor value are similar at high throttle openings (boost).

When two of the compared sensor values above differ by a specified value or more, a sensor abnormality is detected.
- (A) No boost area: Either the BARO sensor or the turbocharger boost sensor is abnormal. (P1233)
- (B) High throttle open degree area (boost): Either the turbocharger boost sensor or the MAP sensor is abnormal. (P1234)
- When abnormal values are detected at both areas (A) and (B), turbocharger boost sensor abnormality is identified. (P0236)
- When the turbocharger boost sensor or the MAP sensor does not change a specified value or more, even when transitioning from (A) to (B) or from (B) to (A), a stuck sensor output value is detected (turbocharger boost sensor: P0236, MAP Sensor P1129).

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
When malfunction of the negative pressure (no boost) area determination (P1233) is detected and the high throttle (boost) area determination (P1234) is detected as normal, a malfunction of the BARO sensor is detected.

Driving Pattern
1. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on.
2. Let it idle for at least 5 seconds.
3. Drive the vehicle with the engine speed 1,750 rpm or more, and the throttle position 22 ° or more for at least 5 seconds.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and the freeze frame data are stored.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs. The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.