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 U250A-86: Error Signal Received From Light Control Module (LH) [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 U250A:86 (AUTO LEVELING CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Error signal received from light control module (LH)
Detection condition	The auto leveling control module received error signal from the light control module (LH).
Fail-safe	Control of the headlight auto leveling system is continued.
Possible cause	Light control module (LH) malfunction Auto leveling control module malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

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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.