P1600 — Serial Communication Link / PCM Communication
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1600 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1600 means on specific makes
Mitsubishi CAUTION
Serial communication fault on the Mitsubishi data link (between PCM and another module). Can disrupt diagnostics and module coordination; sometimes tied to immobilizer/SMARTRA communication on certain models.
- Wiring/connector fault on comm bus
- Failed module on the link
- Immobilizer/anti-theft comm fault (model dependent)
Check first: Check the communication wiring and module power/grounds; scan all modules for who's not responding.
Source: troublecodes.net/mitsu, ricksfreeautorepairadvice.com/mitsubishi-obd2-codes
Related codes
U1000P1715