What this code means
P0602 may indicate that the PCM programming or update process did not complete properly.
What the vehicle may do
- The vehicle may turn on a warning light.
- The vehicle can sometimes appear to operate normally.
- Depending on the PCM state, possible drivability concerns may be present.
Possible fault areas
- Possible incomplete PCM update.
- Possible interrupted programming event.
- Possible PCM programming state concern.
- Possible additional Pending or Confirmed DTCs that may need their own diagnostic path.
Diagnostic path
Open
On this 2010 to 2016 Honda CR-V with the 2.4 gas engine, P0602 is a PCM programming-related code. In plain terms, the PCM may not have completed its update properly. The driver may see a warning light, and depending on the state of the controller, the vehicle can have normal operation or possible drivability concerns. The broad areas here are an incomplete PCM update, an interrupted programming event, the PCM’s programming state, and whether any other stored codes may need their own diagnostic path.
Before the update
Before getting into the P0602 check, start with the basic system checks. Since this code is tied to an update that did not complete, be careful during programming. Do not turn the vehicle to the other than ON mode while updating the PCM. If that happens, the PCM can be damaged.
Update the PCM
The first actual move is straightforward: update the PCM. Treat this as the problem verification step for P0602, because the code is indicated when the PCM update procedure is not completed.
Check the result with the HDS
After the update, use the HDS to check for Pending or Confirmed DTCs. You are looking specifically to see whether P0602 is still indicated after the update attempt.
Make the decision
If P0602 is still indicated, the next call is to replace the PCM. If P0602 is not indicated, the update is complete. At that point, if any other Pending or Confirmed DTCs are present, diagnose those codes on their own path instead of continuing to chase P0602.
Takeaway
The key on P0602 is to keep the diagnosis focused on the PCM update status. Complete the update, check the result with the HDS, and only move on based on whether P0602 comes back. For more diagnostic training, visit stepdiagnostics.com.
Final check
For this code, the diagnostic path often centers on the PCM update status and whether P0602 remains indicated afterward.
For more guided automotive diagnostics, visit STEP Diagnostics.
