What does code P1691 mean on Hyundai vehicles?
The immobilizer antenna is malfunctioning and cannot properly read the key transponder.
OBD-II Code Hyundai
P1691 — Hyundai — Immobilizer Antenna Malfunction
The immobilizer antenna is malfunctioning and cannot properly read the key transponder.
Common symptoms
- Key not recognized
- no start
Possible causes
- Faulty immobilizer antenna
- wiring fault
Initial recommendation
Inspect and replace immobilizer antenna and verify wiring integrity.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Hyundai code P1691 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands