Hyundai DTC P1694 – Immobilizer system – ECM signal malfunction
DTC P1694 meaning on Hyundai
- DTC P1694 indicates an immobilizer system – ECM signal malfunction in Hyundai vehicles.
Hyundai DTC P1694 symptoms
- Engine may not start or may start and then stall immediately.
- Immobilizer warning light may be illuminated on the dashboard.
Hyundai DTC P1694 causes
- Issues with the immobilizer system wiring.
- Defective immobilizer control module.
- Faulty ECM (Engine Control Module).
Hyundai DTC P1694 seriousness
- DTC P1694 can cause inconvenience as the vehicle may not start or may stall unexpectedly.
- It can also lead to potential security concerns if the immobilizer system is not functioning correctly.
How to diagnose DTC P1694 on Hyundai
- Use a diagnostic scanner to retrieve the trouble codes stored in the vehicle’s ECM.
- Inspect the wiring and connections related to the immobilizer system for any damage or corrosion.
- Test the immobilizer control module and ECM for proper functionality.
How to fix DTC P1694 on Hyundai
- Repair or replace any damaged wiring or connectors in the immobilizer system.
- Replace the immobilizer control module if found to be faulty.
- If the ECM is determined to be the issue, it may need to be reprogrammed or replaced.
How to erase DTC P1694 on Hyundai
- After fixing the underlying issue causing DTC P1694, use a diagnostic scanner to clear the trouble codes stored in the ECM.
- Ensure that the immobilizer system is functioning correctly before clearing the DTC.
Recommended tools for Hyundai diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.