SKIM Communication Failure (Chrysler)
What does P1686 mean?
The P1686 code means the vehicle's onboard diagnostic system has detected: SKIM Communication Failure (Chrysler). This is a moderate severity code.
Common Symptoms
- Engine cranks but will not start
- Security light on dashboard
- Check Engine Light on
- No communication with SKIM module on scan tool
- Intermittent starting problems
Probable Causes (Ranked by Likelihood)
- Failed SKIM module Very High
- Broken wiring between PCM and SKIM module High
- Corroded bus communication connector Moderate
- PCM internal communication circuit failure Low
Step-by-Step Diagnostic Procedure
-
Attempt to communicate with the SKIM module using a scan tool. No response indicates a module or wiring failure.
-
Check the wiring between the SKIM module (near the ignition cylinder) and the PCM for continuity.
-
Inspect the SKIM module connector for corrosion or damage.
-
Verify power and ground supply to the SKIM module.
-
If the module has power and ground but does not communicate, replace the SKIM module and reprogram keys.
Frequently Asked Questions
Will the vehicle start at all with this code?
Usually no. When the PCM cannot communicate with the SKIM module, it disables fuel injection as an anti-theft measure.
Do I need to reprogram my keys after SKIM replacement?
Yes. All keys must be reprogrammed to the new SKIM module. This requires a dealer-level scan tool.
Can a dead key fob battery cause P1686?
No. The SKIM system uses the transponder chip in the key blade, which is passive and does not require a battery.