Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Speedometer improper reading - Possible shifting problems

Possible Causes

- Pulse Generator B harness or connectors - Pulse Generator B circuit is open or shorted - Pulse Generator B

When Detected

The Pulse Generator B failed to provide a signal to the TCM upon initial movement of vehicle.

Description

The Pulse Generator detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. The pulse signal is sent to the Transmission Control Module (TCM) which converts it into vehicle speed.