P0750: Shift Solenoid A

What does P0750 mean?

A shift solenoid is an electrically switched valve in the valve body. Manufacturers use these codes differently: Ford reports an open circuit with the base code and shorts separately, newer GM units have separate low/high codes, and the letter is not tied to a valve number (Saab's 9-5: A = valve S2). P0750 is the general code for solenoid A and is used in practice for an open circuit: Ford's step automatics (2012–2023) set it when the smart driver feedback disagrees with the command for 0.5–5 s, with shorts to ground and power as P0973/P0974; Ram's 6.7 L with Aisin transmission calls it 'control circuit open', and a 2023 bulletin traces it to a leaking capacitor in the engine module. GM does not use P0750. With the solenoid unpowered the transmission falls back to a hydraulic default gear with maximum pressure.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine or transmission warning lamp
• Limp mode in a fixed gear, no upshifts
• Harsh shifts from maximum line pressure

Common causes

• High Open or corroded wire or transmission pass-through connector
• Medium Solenoid coil open or shorted
• Medium Internal harness or electronic module in the transmission
• Low Module driver faulty or valve supply missing

Likelihood is a general estimate across vehicles; your make and model may differ.