A/T Gear Position Indicator Does Not Come On While The Shift Lever Is In That Position

A/T gear position indicator does not come on while the shift lever is in that position

Diagnostic Procedure:

1. F-CAN communication line error

2. Gauge control module (tach) defective

3. PCM defective

4. Transmission range switch defective

Also check for:

- Check the F-CAN communication line for a DTC. B1178
- Check the A/T gear position indicator drive circuit in the gauge control module (tach) by using the gauge control module self-diagnostic function. Initial Inspection and Diagnostic Overview
- Inspect the transmission range switch. Testing and Inspection