Code 74, Transmission Input Speed Error 4L80-E Transmission: Notes

WARNING: This page is about a different variant/trim than selected.

Sensor is a permanent magnet type. When rotating trigger teeth pass sensor, an AC voltage signal is produced. Signal voltage and frequency varies with forward rotational speed.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks entire circuit for continuity.
Checks output of input speed sensor.