P0891

SYMPTOM
P0891 - TRANSMISSION RELAY ALWAYS ON

WHEN MONITORED
When ignition key is turned from the OFF position to the RUN position and/or ignition is turned from the CRANK position to RUN position.

SET CONDITION
This DTC is set if the Transmission Control Module senses greater than 3 volts at the Transmission Control Relay Output terminal of the TCM prior to the TCM energizing the relay.

POSSIBLE CAUSES
- Intermittent wiring and connectors
- Transmission control relay stuck closed
- Transmission control relay output circuit short to voltage
- Transmission relay control circuit short to voltage
- TCM - transmission relay always ON