P0979 GMC – Shift Solenoid ‘C’ Control Circuit Low

P0979 GMC Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light),Lack/Loss of power,Transmission shifting problems

P0979 GMC Possible Causes

Faulty Shift Solenoid ‘C’,Shift Solenoid ‘C’ harness is open or shorted,Shift Solenoid ‘C’ circuit poor electrical connection

P0979 GMC Description

The Engine Control Module (ECM) commands gear shifts by turning the shift solenoid valves ON/OFF . When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the engine light and stores the Diagnostic Trouble Code (DTC), and the ECM performs the fail-safe function and turns the other shift solenoids valves in good condition ON/OFF .