P1694 Hyundai Code - Immobilizer ECU Signal Error
Quick Answer
P1694 Hyundai indicates Immobilizer ECU Signal Error. Common causes include Faulty Immobilizer ECU, Immobilizer ECU harness is open or shorted, Immobilizer ECU circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1694 Hyundai indicates Immobilizer ECU Signal Error.
- Common causes
- Common causes include Faulty Immobilizer ECU, Immobilizer ECU harness is open or shorted, Immobilizer ECU circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1694 Hyundai Description
What are the Possible Causes of the DTC P1694 Hyundai?
- Faulty Immobilizer ECU
- Immobilizer ECU harness is open or shorted
- Immobilizer ECU circuit poor electrical connection
How to Fix the DTC P1694 Hyundai?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1694 Hyundai code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1694 Hyundai Code
1. What does the OBDII code P1694 mean on a Hyundai?
P1694 indicates an "Immobilizer ECU Signal Error," meaning the Engine Control Unit (ECU) is not receiving a proper signal from the immobilizer system.
2. What are the common symptoms of a P1694 code in a Hyundai?
Symptoms may include the engine failing to start, the immobilizer warning light staying on, or intermittent starting issues.
3. What causes the P1694 code to appear on a Hyundai?
Common causes include a faulty immobilizer control unit, damaged wiring, a malfunctioning key transponder, or issues with the ECU.
4. Can a dead battery in the key fob trigger a P1694 code?
Yes, if the key fob battery is dead, it may prevent the immobilizer from transmitting a proper signal, causing this code.
5. How can I fix the P1694 code on my Hyundai?
Potential fixes include replacing the key fob battery, repairing damaged wiring, reprogramming the immobilizer system, or replacing the immobilizer control unit if faulty.
6. Is it safe to drive my Hyundai with a P1694 code?
No, a P1694 code typically prevents the engine from starting, so the vehicle may not be drivable.
7. How do I know if my key is causing the P1694 code?
If you have a spare key, try using it to start the car. If the spare key works, the issue may be with the original key’s transponder or battery.
8. Can a faulty ECU cause the P1694 code?
Yes, a malfunctioning Engine Control Unit may fail to recognize the immobilizer signal, leading to this code.
9. Do I need to tow my Hyundai to a dealership for a P1694 code?
If you cannot resolve the issue by replacing the key fob battery or using a spare key, it’s advisable to have the vehicle towed to a dealership or qualified mechanic for further diagnosis.
10. How much does it cost to fix a P1694 code on a Hyundai?
Repair costs can vary widely depending on the root cause, ranging from $10 for a key fob battery replacement to several hundred dollars for immobilizer reprogramming or ECU replacement.
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