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.
Diagnostic Mode 04 - Erase DTC Memory
Diagnostic Mode 04 makes it possible to erase the DTC memory and to reset all emissions-related diagnostic data. In that way, all faults in the DTC memory in the ECM and TCM are erased. The adaptation values may also be reset.
Emissions-related diagnostic data includes (as applicable):
- -MIL Status
- -Number of DTCs
- -Readiness Bits
- -Confirmed DTCs
- -Pending DTCs
- -DTC that belongs to freeze frame
- -Freeze frame data
- -Test results of specific diagnostic functions
- -Distance driven with "MIL ON"
- -Number of Warm-Up Cycles after erasing the DTC memory
- -Distance driven after erasing the DTC memory
- -Misfire counter
Depending on scan tool and protocol used, diagnostic mode 04 and the information provided may be referred to by a different name.
Procedure
-- Connect the scan tool.
-- Switch the ignition to the "ON" position.
-- Then select "Diagnostic Mode 04 - Reset/Delete Diagnostic Data".
The scan tool will display: "Diagnostic data are being erased".
-- Switch the ignition off.
End of Procedure
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.