What this code means
P145C may mean the ECM/PCM is seeing EVAP purge flow behavior that does not match what it expects.
What the vehicle may do
- The vehicle may drive normally.
- An emissions-related warning may be present.
- The condition may be noticed during an EVAP system monitor rather than as a drivability complaint.
Possible fault areas
- Possible EVAP purge-side flow issue.
- Possible purge line connection, blockage, or damage.
- Possible EVAP canister purge valve concern.
- Possible ECM/PCM-detected purge flow plausibility issue.
Diagnostic path
Opening context
On this Honda Accord, P145C points to an EVAP system purge flow malfunction. In plain language, the ECM/PCM may not be seeing purge flow behave the way it expects. The vehicle may drive normally, or it may show an emissions-related warning. Broadly, this can involve the purge side of the EVAP system, possible line restriction or damage, possible connection issues, or a purge valve that may not be moving correctly. Before getting into the code path, save the captured data and any on-board snapshot. That information matters here because the next steps depend on what was stored with P145C.
Start the code check
Start with the basic code check. Turn the ignition to ON, either with the switch in ON two or by selecting ON mode with the start-stop button. Then connect the HDS and check pending and confirmed codes. What you are looking for is whether P145C is stored by itself, or whether it is stored with a related EVAP purge-flow code.
Choose the correct diagnostic path
If P145C is stored by itself, do not guess at a component. Use the captured data from P145C and follow the EVAP purge-flow troubleshooting paths. If a related EVAP purge-flow code is stored at the same time, work that indicated code first, then come back and recheck for P145C. In one same-time purge-flow situation, the path calls out the purge line between the EVAP canister purge valve and the EVAP canister. Check that area for a poor connection, blockage, or damage, and also consider whether the purge valve may be stuck closed. Keep the logic clean: same-time codes steer the first test path; P145C by itself still uses the P145C captured conditions to guide purge-flow diagnosis.
Takeaway
The key takeaway is that P145C is not a standalone parts call. Preserve the captured data, check whether it is alone or grouped with related EVAP purge-flow information, and let that decide the diagnostic route. Once the directed path is complete, recheck for P145C and make sure the fault does not return. For more diagnostic training, visit stepdiagnostics.com.
Final check
P145C should be diagnosed by preserving the captured data, checking whether related EVAP purge-flow codes are present, and following the directed purge-flow diagnostic path instead of guessing at a-re
For more guided automotive diagnostics, visit STEP Diagnostics.
