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.

2013 Mazda MX-5 Miata Grand Touring, Automatic TransFACTORY OEM SERVICE PROCEDURE

Security Light 13, DTC -/B2431/P1260 [Immobilizer System (Advanced Keyless And Start System)]: Notes

DTC B2431/P1260 POSSIBLE CAUSE REFERENCE

DTC	Security light flashing pattern		13	ID number signal is not received
	M-MDS display	Keyless control module	-
		Instrument cluster	B2431
		PCM	P1260
POSSIBLE CAUSE				Any of the following items are touching or near the key head. Spare keys Keys for other vehicles equipped with an immobilizer system Any metallic object Any electronic device, or any credit or other cards with magnetic strips The procedure fails to program the transponder into PCM

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.

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