P1685 — SKIM Reports Invalid/Bad Key Received
STOPIs it safe to drive? Don’t keep driving — risk of real damage or a safety issue.
What P1685 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1685 means on specific makes
Dodge / Jeep / Ram / Chrysler STOP
The Sentry Key Immobilizer Module reports a bad/invalid key was used — the transponder didn't authenticate. Immobilizer prevents start. Similar family to P0513.
- Invalid/unprogrammed key ($50-250)
- Failed transponder ($50-150)
- SKIM module or antenna fault ($100-400)
Check first: Test with a known-good key; scan SKIM for the specific fault and verify key programming.
Source: Allpar Chrysler list / dtcdecode