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 23, DTC -/B2139/P1260 [Immobilizer System (Advanced Keyless And Start System)]: Notes
DTC B2139/P1260 POSSIBLE CAUSE REFERENCE
| DTC | Security light flashing pattern | 23 | ID number data in the PCM and the instrument cluster do not match | |
| M-MDS display | Keyless control module | - | ||
| Instrument cluster | B2139 | |||
| PCM | P1260 | |||
| POSSIBLE CAUSE |
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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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