P1611 — NATS Immobilizer - ID Discord / IMMU-ECM Communication
STOPIs it safe to drive? Don’t keep driving — risk of real damage or a safety issue.
What P1611 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1611 means on specific makes
Nissan / Infiniti STOP
NATS communication/ID-mismatch fault between the immobilizer control unit (IMMU) and the ECM. Like P1610 it blocks starting; commonly seen together with P1610.
- Key ID not registered to ECM
- IMMU<->ECM wiring/communication fault
- Weak battery during start
- Replaced ECM/key needing registration
Check first: Requires NATS/immobilizer registration with a compatible scan tool; verify battery health first. Frequently paired with P1610.
Source: go-parts.com/garage/obd-p1611, justanswer.com Nissan P1610/P1611