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.
Retrieving Diagnostic Trouble Codes: Notes
A/C-heater control assembly monitors system circuits and stores a Diagnostic Trouble Code (DTC) in memory if a problem is detected. All DTCs are stored in memory, except DTC 22. Malfunction is current if DTC 22 is displayed. DTCs are displayed at A/C-heater control assembly temperature display. See Figure. DTCs can also be displayed using a scan tool.
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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.