Immobilizer Key Not Adapted (Volkswagen/Audi)
What does P1522 mean?
The P1522 code means the vehicle's onboard diagnostic system has detected: Immobilizer Key Not Adapted (Volkswagen/Audi). This is a critical severity code.
Common Symptoms
- Engine cranks but will not start
- Immobilizer warning light stays on
- Check Engine Light illuminated
- Key fob buttons may still work (lock/unlock)
- No injector pulse when cranking
Probable Causes (Ranked by Likelihood)
- Replacement key not programmed to the immobilizer Very High
- Immobilizer module lost key adaptation data High
- ECU replaced without immobilizer adaptation Moderate
- Faulty immobilizer control module Moderate
- Communication error between immobilizer and ECU Low
Step-by-Step Diagnostic Procedure
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Attempt to start with all available keys. If none work, the immobilizer adaptation has been lost.
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Use VCDS or a compatible scan tool to check immobilizer module status and stored keys.
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Verify the SKC (Secret Key Code) is available for performing a new key adaptation.
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Check CAN bus communication between the immobilizer module, instrument cluster, and ECU.
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If the ECU was recently replaced, perform the immobilizer-to-ECU adaptation procedure.
Frequently Asked Questions
What does 'not adapted' mean?
The immobilizer system does not recognize the key as being paired to this vehicle. Each key must be electronically linked to the vehicle's immobilizer module through an adaptation procedure.
Why did my key stop working after an ECU replacement?
The immobilizer code is shared between the ECU and the immobilizer module. A new ECU does not have this code and must be adapted to the existing immobilizer using the vehicle's secret key code.
How much does key adaptation cost at a dealer?
Dealer key adaptation typically costs $100 to $300 for programming. If a new key is needed, the key itself adds $100 to $300 depending on the model. Independent shops with VCDS may charge less.