P0751 on Mazda
Shift Solenoid A Performance/Stuck Off
P0751 on Mazda vehicles indicates shift solenoid a performance/stuck off. Au7o has documented this code across 1 Mazda model — most commonly on CX-90. This code means the transmission control module commanded Shift Solenoid A (sometimes called Shift Solenoid 1) but the transmission did not respond properly, with the solenoid acting as though it is stuck 'off.' Shift solenoids are electrically operated valves that direct hydraulic fluid pressure to engage gears, so when one underperforms the transmission may shift harshly, slip, or fail to change gears at the right time. The computer sets this code when the measured gear ratio or shift behavior does not match the commanded state. It generally indicates a hydraulic or performance issue with the solenoid or the fluid circuit it controls inside the automatic transmission.
Common Causes of P0751
- •Stuck or failed Shift Solenoid A
- •Low, dirty, or degraded transmission fluid
- •Clogged solenoid screen or valve body passages
- •Sticking or worn valve body components
- •Wiring or connector problem at the solenoid
- •Internal transmission mechanical wear
- •Faulty transmission control module
P0751 on Mazda by Model
Mazda CX-90(1 issue)
- 8-Speed Automatic Transmission Jerkiness2024-2025
The new Aisin-sourced 8-speed automatic transmission in the CX-90 exhibits jerky low-speed shifts, particularly the 1-2 and 2-3 upshifts. The transmission hesitates during parking lot maneuvers and light throttle driving. This is Mazda's first use of this 8-speed longitudinal gearbox, and early calibration has been rough. Multiple TSBs and software updates have been released.
Looking for P0751 on a different make?
View P0751 across all makes →Frequently Asked Questions
What does P0751 mean on Mazda?▼
P0751 stands for "Shift Solenoid A Performance/Stuck Off." This code means the transmission control module commanded Shift Solenoid A (sometimes called Shift Solenoid 1) but the transmission did not respond properly, with the solenoid acting as though it is stuck 'off.' Shift solenoids are electrically operated valves that direct hydraulic fluid pressure to engage gears, so when one underperforms the transmission may shift harshly, slip, or fail to change gears at the right time. The computer sets this code when the measured gear ratio or shift behavior does not match the commanded state. It generally indicates a hydraulic or performance issue with the solenoid or the fluid circuit it controls inside the automatic transmission. On Mazda specifically, this code is documented across 1 model.
What causes P0751 on Mazda vehicles?▼
Common causes on Mazda: Stuck or failed Shift Solenoid A, Low, dirty, or degraded transmission fluid, Clogged solenoid screen or valve body passages, Sticking or worn valve body components, Wiring or connector problem at the solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0751 on a Mazda?▼
Repair costs vary widely depending on the root cause and specific Mazda model.
Which Mazda models have P0751 documented?▼
Au7o has documented P0751 on 1 Mazda model: CX-90.