What this code means
P2229 may indicate the PCM is seeing the barometric pressure sensor signal higher than expected.
What the vehicle may do
- The vehicle may turn on a warning light.
- The vehicle may have changes in load or airflow calculation behavior.
- Driveability symptoms can vary and may be subtle.
Possible fault areas
- Possible BARO signal concern.
- Possible wiring or connector concern.
- Possible PCM input interpretation concern.
Diagnostic path
Opening context
On this Accord Hybrid, P2229 is a BARO sensor performance code. In plain terms, the PCM may be seeing the barometric pressure signal higher than it expects. The vehicle may have a warning light, and depending on conditions it can affect how the PCM interprets load and airflow. Broadly, you’re thinking about a possible BARO signal issue, wiring or connection concern, or PCM input interpretation problem. Before chasing it, start with the basic system checks and follow a structured diagnostic approach.
Reproduce the fault
The first actual check is simple: turn the vehicle to the ON mode. Then watch the HDS Baro Sensor data. This code is about whether that BARO value is higher than the limit for the vehicle’s market.
Evaluate the BARO value
For USA and Canada models, if the HDS Baro Sensor value is more than 855.1 mmHg, the failure is duplicated. For Mexico models, if the HDS Baro Sensor value is more than 879.8 mmHg, the failure is duplicated. Keep those thresholds separated by market, because the decision point is not the same.
Verification and takeaway
After any diagnostic work, keep verification separate from the test itself. Verify the repair and confirm the code stays gone under the conditions that would let the PCM judge the BARO signal again. The takeaway is straightforward: P2229 is confirmed by an abnormally high HDS Baro Sensor reading, using the correct market-specific threshold. For more diagnostic training, visit stepdiagnostics.com.
Final check
Use the scan tool BARO value and the correct market-specific threshold to decide whether the fault is duplicated.
For more guided automotive diagnostics, visit STEP Diagnostics.
