Immobilizer antenna coil winding

Tags: #immobilizer

The immobilizer chip is read by a wire wound in a spiral pattern acting as an antenna, transmitting to a reader coil (typically around the ignition-lock barrel). The number of turns and the winding tension are both critical — even a slight variation in either can break the signal and prevent the immobilizer from recognizing the key. Rewinding the coil with the identical original specifications (same turn count, same tension) restores function ¹²³⁴⁵⁶.

Related pages

• Immobilizer module — location and water damage
• Key fob programming and battery
• No-crank — RKE relay and harness damage
• Engine cranks but won't start — diagnostic checklist
• Ignition coil replacement (open question)

Sources

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Last updated: 2026-07-24