Incorrect Immobilizer Key
The P0513 code means the vehicle's onboard diagnostic system has detected: Incorrect Immobilizer Key. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $100 - $800 (parts and labor)
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Common Symptoms
- Engine cranks but will not start
- Security/immobilizer light flashing
- Check Engine Light on
- Key not recognized by vehicle
Probable Causes (Ranked by Likelihood)
- Transponder chip in key is damaged or not programmed Very High
- Faulty immobilizer antenna ring around ignition cylinder High
- Immobilizer control module malfunction Moderate
- ECM-immobilizer communication failure Moderate
Step-by-Step Diagnostic Procedure
-
Try a spare key if available; if the spare works, the original key transponder is faulty
-
Check the security/immobilizer indicator light behavior; a flashing light confirms the system does not recognize the key
-
Inspect the immobilizer antenna ring around the ignition cylinder for damage or loose connections
-
Use a dealer-level scan tool to verify key registration and immobilizer module communication
Frequently Asked Questions
Why does my car not recognize my key?
The immobilizer system requires the key transponder chip to transmit the correct coded signal. If the chip is damaged, the battery in the key fob is dead (for proximity keys), or the key is not properly programmed, the system will reject it.
Can I program a new key myself?
Most modern vehicles require a dealer-level scan tool or specialized key programmer to register new keys. Some older vehicles have a self-programming procedure using existing registered keys. Check your owner manual for specific procedures.
Can P0513 be caused by a dead key fob battery?
On vehicles with push-button start and proximity keys, a dead key fob battery can prevent the immobilizer from reading the transponder signal. Try holding the key fob directly against the start button, as many vehicles have a backup reader there.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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