When your Jeep fails to start, it is often due to the P1685 code, which stands for Smart Key Immobilizer Module Invalid Key. This code is sent to the Powertrain Control Module (PCM) when an incorrect key is inserted in the ignition. This could be due to attempted theft, a faulty key, or even a malfunctioning Smart Key Immobilizer Module (SKIM). To diagnose and rectify this code, one must first understand its causes and possible solutions.
Causes and Solutions for Jeep P1685 Code
| Cause | Solution |
|---|---|
| Attempted Theft | Obtain the correct key and attempt to start the vehicle |
| Faulty Key | Replace the faulty key and attempt to start the vehicle |
| Malfunctioning SKIM | Replace the SKIM and attempt to start the vehicle |
| PCM Reset | Do a PCM Reset function to clear the code after engine startup |
Attempted Theft
When the Jeep P1685 code is sent to the PCM, it typically means that someone has attempted to steal the car. To rectify this, the correct key must be obtained and used to attempt to start the vehicle. If the car still fails to start, the code may be due to a faulty key or a malfunctioning SKIM.
Faulty Key
A faulty key can also be the cause of the P1685 code, and can be easily rectified by replacing the key and attempting to start the vehicle. If the key is not replaced, the code can remain active and the car will not start.
Malfunctioning SKIM
The Smart Key Immobilizer Module (SKIM) can also be the cause of the Jeep P1685 code. If the SKIM is malfunctioning, it must be replaced and the vehicle should be able to start after this. If the SKIM is not replaced, the code can remain active and the car will not start.
PCM Reset
If the Jeep P1685 code is still active after attempting to start the car with a new key or SKIM, then a PCM reset function must be done. This will clear the code and the car should be able to start after this.
Conclusion: Resolving Jeep P1685 Code
The Jeep P1685 code is a common issue when a vehicle fails to start. This code is sent to the Powertrain Control Module (PCM) when an incorrect key is inserted into the ignition. The cause of the code can be due to attempted theft, a faulty key, or even a malfunctioning Smart Key Immobilizer Module (SKIM). To rectify this code, the correct key must be obtained, the faulty key must be replaced, the SKIM must be replaced, and finally, a PCM reset must be done to clear the code after engine startup. With the right knowledge and the proper solutions, resolving the Jeep P1685 Code can be a relatively easy task.
https://www.youtube.com/watch?v=jvG2xubQXj8