P0751 – GMC

Code : P0751
Make : GMC
Description : P0751 GMC 1-2 Shift Solenoid Valve Performance – No First or Fourth Gear
Possible causes :
– Low transmission fluid level
– Dirty transmission fluid
– Faulty 1-2 Shift Solenoid valve
– 1-2 Shift Solenoid valve harness or connectors
– 1-2 Shift Solenoid valve circuit is open or shorted
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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