P1693 — Companion DTC Stored in Other Module (PCM/TCM)
What P1693 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1693 means on specific makes
Dodge / Jeep / Ram / Chrysler CAUTION
A 'pointer' code: the companion module (the other of PCM/TCM) has logged a fault. P1693 itself tells you to go read the OTHER module's codes for the actual problem. Not a standalone fault.
- A real DTC stored in the companion controller (read it) ($varies)
- Bus communication issue between modules ($50-200)
Check first: Scan BOTH the PCM and TCM (and check bus comms) — the real fault lives in the companion module.
Hyundai / Kia CAUTION
Hyundai/Kia-specific (also used by Chrysler/Dodge as a generic 'secondary code present' message — context matters). On Hyundai/Kia it means the immobilizer (SMARTRA) couldn't authenticate the key transponder, so the engine may not start.
- Faulty/damaged transponder key or dead key battery ($50-300 to cut/program)
- Immobilizer antenna coil around the ignition lock ($50-150)
- SMARTRA / immobilizer module fault
- Wiring/connector between coil and module
Check first: Try the spare key. If both fail, check the antenna ring at the ignition and the immobilizer module. Note: on Dodge/Cummins, P1693 just means 'another code is stored in the PCM/ECM' — read that other code.