P0513

Code

Generic P — Powertrain

Incorrect Immobilizer Key

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 37 RU: 29

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Page language: EN

Verify DTC P0513 and note freeze frame data with a scan tool
Try a known-good/spare programmed key and observe behavior
Check key fob battery voltage and replace if low
Inspect immobilizer antenna/ring around ignition cylinder for physical damage and secure mounting
Inspect fuses and power/ground at immobilizer/antenna circuits
Scan immobilizer/BCM/ECM for additional related DTCs and communication errors (U-codes)

Transponder frequency: typically ~125 kHz (low frequency LF) for read coil
Transponder ID: unique serial code read by immobilizer (hex/string) — compare stored ID vs read ID
Antenna coil resistance: manufacturer-specific (check service data) — look for open/short
Power to immobilizer antenna: typically switched 12 V or ignition-switched supply — check presence with key cycle
Data bus: immobilizer ↔ BCM/ECU communications usually over CAN/LIN — check for valid CAN/LIN traffic and module responses
Security lamp/LED status: steady/flash patterns according to manufacturer (indicates learn/lock states)

Record code and freeze frame with a scan tool; check for related DTCs in BCM/ECM/immobilizer module
Attempt to start using the original key and then a verified spare programmed key. Note differences (if spare works, fault is likely key-related)
Check/replace key fob battery if transponder and fob share housing; retest recognition
Visually inspect ignition cylinder/antenna ring and wiring for damage; measure supply voltage and ground to the antenna/reader with ignition on
Measure antenna coil resistance and continuity to module (compare to service spec) and check for short to ground
Use a dealer-level or manufacturer-capable diagnostic tool to read the transponder ID from the presented key and compare with immobilizer stored IDs
If key is not learned, attempt immobilizer key re-learn procedure per service manual (some vehicles require dealer tools/security PIN)
Check for and resolve any CAN/LIN communication faults (U-codes) that could prevent immobilizer and ECU coordination
If antenna/module wiring and keys check good but immobilizer still fails to recognize keys, consider immobilizer module or BCM fault — verify module power, grounds and attempt software re-flash or reprogram per manufacturer guidance
After repairs or reprogramming, clear codes and perform multiple start cycles to confirm fault does not return; document any keys added or replaced
If security/system programming is required beyond shop capability, advise dealer or locksmith with OEM programming access