What this code means
P2229 means the ECM/PCM may be seeing a barometric pressure sensor circuit signal that is higher than expected.
What the vehicle may do
- The check engine light may be on.
- The vehicle may have driveability symptoms, or it may feel normal if the condition is intermittent.
- The condition can be present only under certain operating conditions.
Possible fault areas
- BARO sensor signal input may be involved.
- PCM software may be involved.
- The PCM itself may be involved.
- An intermittent electrical or connection-related condition may be involved.
Diagnostic path
Opening context
On this Honda CR-V, P2229 points to the barometric pressure sensor circuit reading higher than expected at the ECM/PCM. In plain terms, the computer is seeing a BARO signal that may be too high for the conditions. The vehicle may set the check engine light, may have limited driveability symptoms, or it may feel normal if the fault is intermittent. Broadly, this can involve the BARO signal input, PCM software, the PCM itself, or an intermittent condition that only shows up under certain operating conditions. Before digging in, start with the basic system checks and follow a structured diagnostic approach.
Duplicate the condition
Start the problem verification by turning the vehicle to the ON mode. At this point, we are not trying to guess at a repair. We are setting the vehicle up so the BARO sensor data can be checked directly.
Check BARO sensor data
With the HDS, look at the BARO SENSOR parameter. The key threshold for this code is BARO SENSOR More than 4.49 V. Compare the current reading to that threshold and let that result drive the next move.
If the threshold is matched
If the current condition matches the threshold, the failure is duplicated. From there, update the PCM if it does not already have the latest software, or substitute a known-good PCM, then recheck. If P2229 goes away after the PCM update, troubleshooting is complete. If P2229 goes away with the known-good PCM substituted, replace the original PCM.
If the threshold is not matched
If the current condition does not match the threshold, treat it as an intermittent failure, and the system is OK at this time. If captured data is recorded for this code, try to reproduce the failure under those same conditions instead of forcing a repair based on a code alone.
Verification and takeaway
Keep verification separate from the test decision. After the update or PCM substitution path, recheck and confirm P2229 stays gone. The main takeaway is simple: verify the BARO SENSOR reading against More than 4.49 V, then follow the duplicated-failure or intermittent-failure path without guessing. For more diagnostic training, visit stepdiagnostics.com.
Final check
Use scan data to confirm whether the BARO signal condition is present now, then follow the duplicated-failure or intermittent-failure path.
For more guided automotive diagnostics, visit STEP Diagnostics.
