Fiat 500X 1st generation (2016–2023) — Key Programming Reference
- Difficulty
- hard
- Lishi / lockout
- SIP22
Key fobs & transponder keys (2 variants)
| Key | Years | FCC ID | P/N | Chip | Freq | Battery | Blade |
|---|---|---|---|---|---|---|---|
| 433.92 MHz · M3N-40821302 | 2016–2023 NA (Europe/AU/JP 2015–2024) | M3N-40821302 | 735637066 | NXP HITAG-AES (PCF7953M / NCF29A1) | 433.92 MHz | CR2032 | SIP22 |
| 433.92 MHz · 2ADFTFI5AM433TX | 2016–2023 NA (Europe/AU/JP 2015–2024) | 2ADFTFI5AM433TX | 68296748AA | Megamos AES | 433.92 MHz | CR2032 | SIP22 |
Programming procedures
What the job needs
- Add a key: 1 existing working key required.
- All keys lost: no existing working key needed.
- PIN / security code: required — Tech Authority + NASTF dealer.
- Online / server access: required — AES cloud token (Autel).
- On-board (no tool) sequence: not available — Fiat 500X SKIM 4 AES requires professional OBD tool — no self-programming.
- On site: engine off · Maintain 12V+ · Clear SKIM DTCs.
- Bring: Photo ID + vehicle registration. VIN cross-check before start.
Tool coverage
Documented for this case on: Autel IM608 Pro II · Autel IM508S · Autel KM100 · Xhorse Key Tool Plus · Xhorse Key Tool Max Pro · Lonsdor K518 Pro / K519 · OBDSTAR X300 DP Plus · AutoProPad G2/G3 · Advanced Diagnostics Smart Pro · Launch X431 IMMO Elite / IMMO Plus. Step-by-step menu paths for each tool are in the app.
Notes & cautions
- This chassis Fiat 500X uses NXP HITAG-AES (PCF7939M / PCF7953M, Stellantis SKIM 4, 2016-2023). Requires online AES token: Autel IM608 Pro II + IMKPA Chrysler cloud (~$5-15/session), Lonsdor K518 USA Chrysler AES module, Xhorse VVDI Key Tool Plus + KH100. PIN mandatory (Tech Authority subscription / NASTF / dealer on newest Wagoneer/Grand Wagoneer).
- Standard 16-pin DLC OBD path; no XP400 PRO bench, no APB112 simulator needed for OBD enrolment.
- Smart proximity or remote head key: ensure existing key fob battery is functional before starting.
- Verify chip before booking (this chassis facelift): Stellantis SKIM 4 AES era (2015+) replaced SKIM 3 PCF7941 on mid-cycle facelifts. Some 2014-2016 Chrysler 200, Grand Cherokee, Wrangler shipped with mid-MY chip swap — confirm transponder ID from a working key with Lonsdor K518 reader before quoting.
- Tool kit context: Autel IMKPA Chrysler cloud token (~$5-15/session) and Lonsdor LKE Smart Key Emulator for K518 simulated-key flow are the dominant accessories. Xhorse KH100 Chrysler also confirmed. APB112 simulator, G-Box bench EEPROM NOT required. XP400 PRO only for SKIM module bench fallback.
- All existing keys erased. Bring ALL replacement keys before starting — minimum 2.
- No manual AKL for Fiat 500X SKIM 4 AES — professional tool mandatory.
- AKL via OBD needs AES cloud token + PIN (Tech Authority / NASTF / dealer-bound on 2024+ Wagoneer).
- Keep all existing/lost key fobs at least 10 metres from vehicle during AKL.
- AKL accessory needs: Autel IMKPA + Chrysler AES token, Lonsdor LKE Smart Key Emulator for K518 simulated-key AKL path, Xhorse KH100 Chrysler. APB112 NOT mandatory. G-Box bench NOT used. XP400 PRO only if SKIM module EEPROM corrupted (rare).
Lockout
Door pick / decode: Lishi SIP22 (CW).
41 verified sources · Last verified: 2026-08-10
Open full case in KeyAssist →Step-by-step tool menu paths, verified source links and video guides for this case are in the KeyAssist app — free to start, works offline.