Pinpoint Test G : DTCS P177B, P177D: Notes
WARNING: This page is about a different variant/trim than selected.
Refer to TRANSMISSION CONTROLS - 6F50/6F55 for schematic and connector information.
Normal Operation and Fault Conditions
The TRCM receives two voltage inputs from the BJB. The hot in start and run fuse 23 (15A) circuit powers the TRCM micro processor. The hot at all times fuse 83 (20A) circuit powers the motors in the TRCM that are used to move the selector lever cable and the transmission manual valve inside the main control valve body.
NOTE:
These Diagnostic Trouble Codes (DTCs) may be caused by mechanical issues.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P177B | Transmission Range Select Motor Current Too High | This DTC indicates the TRCM is experiencing excessive current draw when shifting between positions. |
| P177D | Default Position Motor Current Too High | This DTC indicates the default to park motor overheated during a default to park event. |
Possible Sources
- Connectors damaged, pushed-out or corroded terminals
- Selector lever cable
- Mechanical obstruction in the path of the TRCM output arm
- TRCM mechanical/electrical integrity