SKIM Invalid Key (Chrysler)
What does P1685 mean?
The P1685 code means the vehicle's onboard diagnostic system has detected: SKIM Invalid Key (Chrysler). This is a moderate severity code.
Common Symptoms
- Engine cranks but does not start
- Security indicator light flashing
- Check Engine Light on
- Key not recognized by immobilizer
- Intermittent no-start condition
Probable Causes (Ranked by Likelihood)
- Faulty transponder in ignition key Very High
- Damaged SKIM module antenna ring around ignition cylinder High
- SKIM module internal failure Moderate
- PCM and SKIM module out of sync Low
Step-by-Step Diagnostic Procedure
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Try a second programmed key. If the second key works, the first key transponder has failed.
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Inspect the SKIM antenna ring around the ignition lock cylinder for damage or disconnection.
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Check for communication between the SKIM module and PCM using a scan tool.
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Verify the SKIM module is receiving power and ground.
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If a new key is needed, it must be programmed using a dealer-level scan tool or qualified locksmith.
Frequently Asked Questions
What is the SKIM system?
SKIM stands for Sentry Key Immobilizer Module. It is Chrysler's anti-theft system that verifies the transponder chip in your key before allowing the engine to start.
Can I bypass the SKIM system?
Bypassing the immobilizer is not recommended and may be illegal in some areas. It also removes the vehicle's theft protection.
How much does a new transponder key cost?
A new Chrysler transponder key typically costs $80-$200 from a dealer or locksmith, including programming.