P0751: How to Diagnose & Fix — Shift Solenoid A Performance/Stuck Off
62 vehicles · 19 makes · $5-$8,000 repair
How to diagnose and fix P0751: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Ford Mustang · 2015–2023
The MT82 6-speed manual transmission is notorious for multiple issues including gear grinding (especially 1st to 2nd and into 3rd gear when cold), high RPM lockout preventing shifts, notchy/difficult shifts, premature synchronizer wear, and in severe cases complete transmission failure. The transmission was originally designed for smaller four-cylinder vehicles and the synchronizers struggle to handle the Mustang's higher horsepower.
Common Symptoms
- Grinding noise when shifting into 2nd or 3rd gear
- Difficulty shifting when transmission is cold
- Notchy or stiff shifter feel
- Gear lockout at high RPM
- Popping out of gear
- Clutch chatter or judder
How to Fix
Ford has released multiple TSBs including TSB 11-3-18 recommending lower viscosity transmission fluid for cold shift issues. Replacing OEM fluid with Motorcraft XT-M5-QS or aftermarket fluid like Royal Purple Synchromax can help. Severe cases may require synchronizer replacement ($800-1,500) or full transmission rebuild/replacement ($2,500-4,500). Some owners opt for aftermarket transmissions like the Tremec Magnum ($4,000-6,000 installed).
Sources for this issue (1)
Honda Odyssey · 1999–2004
Complete transmission failure due to faulty bearings and defective 3rd clutch components in 4-speed (1999-2001) and 5-speed (2002-2004) automatic transmissions. The 2002-2004 transmission can suddenly downshift from 5th to 2nd gear causing dangerous drivability issues. Honda recalled 1.1 million vehicles in 2004 and settled class-action lawsuit in 2006.
Common Symptoms
- Sudden harsh downshifts from 5th to 2nd gear
- Grinding or whining noises from transmission
- Slipping between gears
- Transmission overheating
- Complete failure to shift
- Metal fragments in transmission fluid
How to Fix
Complete transmission replacement or rebuild required. Honda extended transmission warranty to 93 months/109,000 miles for 1999-2001 models. For 2002-2004 models with under 15,000 miles, dealers modified oil cooler return line; over 15,000 miles showing overheating damage received complete transmission replacement.
Owner tips & cautions
- WarningThis is the most serious issue affecting 2nd generation Odysseys - avoid 1999-2004 models unless transmission has been completely replaced
- TipCheck transmission fluid regularly for metal particles and discoloration indicating overheating
- TipRequest CarFax and maintenance records showing transmission replacement before purchasing used 1999-2004 Odyssey
- TipTransmission fluid should be changed every 30,000 miles on these models (not Honda's recommended 90,000) to prolong life
Sources for this issue (2)
Mazda CX-90 · 2024–2025
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.
Common Symptoms
- Jerky or harsh 1-2 and 2-3 upshifts at low speed
- Hesitation when accelerating from parking lot speeds
- Shudder during light-throttle cruising at 25-40 mph
- Occasional delayed engagement when shifting from Park to Drive
How to Fix
Update TCM software at Mazda dealer - multiple calibration updates have been released. Transmission adaptive learning may take 500+ miles to optimize. Perform ATF drain and fill at 30,000 miles. In severe cases, valve body replacement has resolved shift quality issues.
Owner tips & cautions
- TipRequest latest TCM calibration update at dealer - Mazda has released 3+ revisions
- TipAllow 500+ miles of mixed driving after update for transmission to relearn shift patterns
- TipSport mode provides crisper shifts for daily driving - MazdaCX90Forum.com transmission thread
Sources for this issue (1)
MINI Cooper S · 2007–2020
Honda Pilot · 2016–2019
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P0751 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0751 mean?
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.
What are the most common causes of P0751?
The most common causes of P0751 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0751?
Repair costs for P0751 range from $5 to $8,000, depending on the vehicle and root cause.
Which vehicles are affected by P0751?
Au7o has documented P0751 across 62 vehicle models from 19 manufacturers: Audi, Buick, Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Jeep, Kia, Lincoln, MINI, Mazda, Nissan, Subaru, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.