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.

2022 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

DTC U3000-42: Auto Leveling Control Module Internal Malfunction [Auto Leveling Control Module]: Outline

WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC U3000:42 (AUTO LEVELING CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Auto leveling control module internal malfunction
Detection condition	The auto leveling control module detects the internal malfunction.
Fail-safe	The headlight leveling actuator is stopped at the position when the malfunction is determined.
Possible cause	Auto leveling control module internal malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Factory Service Tools

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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.