What this code means
The ECM/PCM may be seeing a BARO sensor signal that is lower than expected.
What the vehicle may do
- The warning light may come on.
- The vehicle can have changes in performance or system response depending on how the signal is being used.
- The fault may be noticed mainly as a stored code during scan-tool diagnosis.
Possible fault areas
- Possible BARO sensor signal concern.
- Possible connector or wiring condition in the BARO sensor circuit.
- Possible ECM/PCM input concern.
Diagnostic path
Open on the fault logic
On this 2020 to 2025 Honda CR-V Hybrid, P2228 is a barometric pressure sensor circuit low-voltage fault. In plain terms, the ECM/PCM may be seeing a BARO signal that is lower than expected. The vehicle may turn on the warning light, and depending on how the signal is being used at the time, it can affect how the system judges engine load and operating conditions. Broadly, this can point toward a possible BARO signal issue, a connector or wiring concern, or a control-module input problem. Before chasing the number, start with the basic system checks and follow a structured diagnostic approach.
Set up the check
For the code-specific check, turn the vehicle to the ON mode. At this point, do not jump to parts. The goal is to see whether the BARO reading is actually low enough to duplicate the fault condition.
Read the BARO value
Now check the HDS Baro Sensor value. On USA and Canada models, if the value is less than 371.2 mmHg, the failure is duplicated. On Mexico models, if the value is less than 331.4 mmHg, the failure is duplicated.
Understand the decision point
The diagnostic logic is straightforward: if the BARO sensor output is lower than the specified value, the PCM treats that as an abnormal condition and stores P2228. So the important call here is whether the scan-tool BARO value is below the correct threshold for the vehicle market. If the result does not line up with the path you are on, pause, recheck the earlier diagnostic path, and avoid guessing.
Close and verify separately
Keep the testing focused: key on, read the HDS Baro Sensor value, and compare it to the correct market threshold. If the low BARO condition is duplicated, continue diagnosis from that confirmed condition. After the concern is addressed, keep verification separate and confirm the code stays gone. For more diagnostic training, visit stepdiagnostics.com.
Final check
Use the scan-tool BARO reading to decide whether the low-voltage fault condition is duplicated, then verify the code stays gone after the concern is addressed.
For more guided automotive diagnostics, visit STEP Diagnostics.
