Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pcm Reset Procedure/Clearing Diagnostic Trouble Codes
To clear codes use the Honda PGM Tester or the HDS use the "CLEAR COMMAND". The PCM stores data and DTCs to correct the system even when there is no electrical power such as the NO. 10 BACK UP fuse or battery negative cable disconnected.
Honda PGM Tester and HDS has 3 kinds of clear commands to meet the purpose.
- DTC clear. This command erases all stored DTC codes and Freeze Data.
- PCM clear. This command erases all stored DTC codes, Freeze Data and all specific data to correct the system except CKP pattern.
- CKP clear. This command erases only CKP pattern data. This command is for the repair of a misfire or CKP sensor. If CKP pattern data is cleared from PCM, you must do the CKP pattern relearn procedure by test drive. See CKP PATTERN LEARN PROCEDURE .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.