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.
DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction: Description
This DTC will be output if the transponder key ECU assembly does not detect that the unlock warning switch assembly is on even when the ignition switch is on (under normal condition, the unlock warning switch is on when the ignition switch is on).
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B2780 | Unlock warning switch assembly on is not detected when ignition switch is on |
|
NO RELATED
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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.