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.
TCL/ASC Diagnostic Trouble Code Detection Conditions
TCL/ASC diagnostic trouble codes (TCL/ASC DTCs) are set under different conditions, depending on the malfunction detected. Most TCL/ASC DTCs will only be set during vehicle operation. Some TCL/ASC DTCs will also be set during the TCL/ASC self-check immediately after the engine is started.
When you check if an TCL/ASC DTC will be displayed again after the DTC has been erased, you should duplicate the TCL/ASC DTC set conditions. Depending on the detection timing and set conditions for the specific TCL/ASC DTC, you must either drive the vehicle or turn the engine off and restart it. To set the proper conditions for that DTC again, refer to "TCL/ASC DTC SET CONDITIONS " for each TCL/ASC DTC that you are trying to reset.
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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.