01 Fix This First If Your Car Won’t Start (Before Calling a Me… • 02 Why Engine Capacity Matters When Shopping For A New Car • 03 Is Your Car Alternator Dying? Symptoms, Causes, and Solutio… • 04 What Happens When Engine Oil Circulates Inside a Car Engine… • 05 This Is How Burning Odors Mean An Electrical Short Under Th… • 06 Beginner's Guide to Operating an Excavator: Step-by-Step Ba… • 07 From Farm Tracks To City Streets: Why The Land Rover Defend… • 08 This Is How to Fix Dim Headlights With a Simple Trick • 09 How to Diagnose a Car That's Not Accelerating Properly • 10 Car Parts Brands that Are Trusted by Professionals •

DTC codes / Nissan codes / P1660

P1660 · NissanA/T FI Data Line Failure

P1660 on Nissan vehicles indicates that the automatic transmission (A/T) control module has detected a failure in the serial data line that carries fuel injection (FI) information between the engine control module (ECM) and the transmission control module (TCM). This line is used for torque management and shift quality, so the TCM sets the code when the expected data stream is missing, corrupted, or intermittent.

SystemPowertrain
Code typeNissan specific
SeverityMedium
Fix difficultyProfessional
AreaComputer and output circuits

Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage