P0888 Chevrolet Transmission Relay Always Off

P0888 Chevrolet Transmission Relay Always Off

Possible causes
– Transmission Control Relay harness is open or shorted
– Transmission Control Relay circuit poor electrical connection
– Faulty Transmission Control Relay
– Faulty Transmission Solenoid/Pressure Switch Assembly
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0888 Chevrolet Description

The Transmission Control Module (TCM) has detected less than 3 volts at the Transmission Control Relay output circuit