OBD Guide
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P1685

Invalid SKIM Key

P1685 is an OBD-II diagnostic trouble code meaning: Invalid SKIM Key. Common causes: faulty ignition key, problems with the skim module. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • The immobilizer indicator is flashing
  • Check Engine Light Is On
  • The key is not recognized by the system

Causes

  • Faulty ignition key
  • Problems with the SKIM module
  • Wiring damage
  • Immobilizer software failure

How to Fix

  1. Check the ignition key for compatibility
  2. Diagnose the SKIM module
  3. Check wiring integrity
  4. Reprogram the key or immobilizer module
  5. Repair only from an authorized dealer

Related codes

P1682P1686

Error P1685 by Vehicle Brand

BuickCadillacChevroletChryslerDodgeGMGMCJeepMazdaOldsmobilePlymouthPontiacSaturn

FAQ

What does the P1685 code mean?

P1685 is an OBD-II diagnostic trouble code that indicates: Invalid SKIM Key

What causes a P1685 error code?

The most common causes of P1685 include: Faulty ignition key; Problems with the SKIM module; Wiring damage; Immobilizer software failure.

How do I fix a P1685 diagnostic trouble code?

To fix P1685: Check the ignition key for compatibility. Diagnose the SKIM module. Check wiring integrity. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1685?

Yes, but get it checked soon

How much does it cost to fix P1685?

The estimated repair cost for P1685 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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