What this code means
P2228 may mean the PCM is seeing a barometric pressure sensor signal that is lower than expected.
What the vehicle may do
- The vehicle may run normally when the fault is not active.
- A drivability concern can be possible if the signal issue is active or intermittent.
Possible fault areas
- Possible BARO signal input concern
- Possible related circuit condition
- Possible PCM software status issue
- Possible PCM fault
Diagnostic path
Opening context
On this 2010 to 2016 Honda CR-V with the 2.4 gas engine, P2228 points to a low-voltage condition on the BARO sensor circuit. In plain terms, the PCM may be seeing a barometric pressure signal that is lower than expected. The vehicle may run normally when the fault is not active, or it can have an intermittent drivability concern when the signal issue shows up. Broadly, possible fault areas can include the BARO signal input, the related circuit condition, PCM software status, or the PCM itself. Before getting into the code path, start with the basic system checks so you are not chasing this code from the wrong starting point.
Duplicate the fault
Begin the P2228 check by turning the vehicle to the ON mode. With the HDS connected, look at the BARO SENSOR parameter. The key comparison is the BARO SENSOR reading: Less than 1.31 V.
If the low reading is present
If the BARO SENSOR value is Less than 1.31 V, the failure is duplicated. At that point, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If P2228 goes away after the PCM update, troubleshooting is complete. If P2228 goes away with the known-good PCM installed, replace the original PCM.
If the low reading is not present
If the BARO SENSOR value is not Less than 1.31 V, treat it as an intermittent failure, and the system is OK at this time. If captured data is available for this code, use those same captured conditions to try to reproduce the failure. Do not guess at a repair just because the code is in history; make the failure show itself again before moving forward.
Verification and takeaway
Keep verification separate from the initial check. After a PCM update, PCM substitution, or another attempt to duplicate the concern, recheck and confirm P2228 stays gone. The takeaway is to prove whether the low BARO signal is active right now: if it is, follow the PCM software or known-good PCM path; if it is not, handle it as intermittent and reproduce the captured conditions before making a call. For more diagnostic training, visit stepdiagnostics.com.
Final check
This diagnosis often depends on whether the low BARO signal can be duplicated during the scan tool check.
For more guided automotive diagnostics, visit STEP Diagnostics.
