P0513 Incorrect Immobilizer Key

P0513 indicates an incorrect immobilizer key condition. The powertrain controller is not accepting the key, transponder, or security authorization it receives.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace powertrain parts before checking key authorization, immobilizer communication, and module programming state.

Symptoms of P0513

Unstable, high, or low idle, or stalling.
Erratic speedometer, cruise-control, or shift behaviour.
Check-engine light with a hesitation or surge.

Common causes of P0513

A dirty throttle body, idle-control valve, or throttle-position sensor.
A failing vehicle-speed or wheel-speed sensor, or its wiring.
Vacuum leaks or a related sensor forcing the idle/speed strategy.

Useful checks before replacing parts

Review immobilizer status, key recognition, security light behavior, start authorization, freeze-frame data, and communication codes between PCM, BCM, and immobilizer modules.
Inspect key transponder condition, antenna ring wiring, module power and ground, battery voltage, programming history, and spare key behavior.
Confirm whether the issue follows one key, appears after module replacement, or occurs with communication or voltage faults.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.