What does code P1682 mean?

Q: What does code P1682 mean?

A/T FI Signal A High Input. P1682 on a Nissan means the Transmission Control Module (TCM) has detected an abnormally high voltage on the Automatic Transmission (A/T) Fuel Injection (FI) signal circuit, which is the communication line between the TCM and the Engine Control Module (ECM). The TCM expects a specific voltage range on this signal wire, and a reading above the upper threshold triggers the code.

DTC codes / Nissan codes / P1682

P1682 · NissanA/T FI Signal A High Input

P1682 on a Nissan means the Transmission Control Module (TCM) has detected an abnormally high voltage on the Automatic Transmission (A/T) Fuel Injection (FI) signal circuit, which is the communication line between the TCM and the Engine Control Module (ECM). The TCM expects a specific voltage range on this signal wire, and a reading above the upper threshold triggers the code.

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.