P0771 on Mazda: How to Diagnose & Fix
Shift Solenoid E Performance/Stuck Off
1 Mazda model · 1 documented issue · 1 critical · $400-$2,500 repair
P0771 on Mazda by model: symptoms, diagnosis and fix
The FN4A-EL (Mazda's version of the Ford 4F27E) four-speed automatic used in the BK Mazda3 suffers sticking shift solenoids and worn valve-body bores. When a solenoid sticks or its driver circuit in the TCM fails, line pressure is no longer properly controlled: the car bangs into gear, flares between shifts, holds a single gear in limp mode, or refuses to shift out of first. Owners report the P0766/P0767 (shift solenoid D) and P0771 (shift solenoid E) family of codes, frequently after the fluid has gone past its life and clutch debris has circulated through the valve body. Long-neglected fluid accelerates it - the burnt clutch material is what makes the solenoid valves stick in the first place.
Common Symptoms
- Harsh or banging shifts
- Flare or slip between gears
- Stuck in one gear / limp mode
- No upshift from first
- Check engine light with transmission solenoid codes
- Burnt-smelling dark ATF
How to Fix
Scan for the specific solenoid code before assuming the transmission is finished. Start with a proper drain-and-fill using Mazda ATF M-V (never a generic Dexron substitute) and inspect the pan and magnet for clutch material. If codes return, the correct repair is a valve body with new shift solenoids - Mazda's own guidance for a stuck 1-2 solenoid control valve is valve body replacement. Verify the TCM solenoid driver circuits and the internal harness before installing a valve body, since a failed driver in the module will set the same code on a brand new solenoid. Where the fluid was burnt and the car slips under load, a full rebuild is the durable answer.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mazda ATF M-V transmission fluid 0000-77-112E-01OEMMazda 0000-77-112E-01
Exact Mazda M-V fluid for a correctly scoped drain-and-fill on the FN4A-EL/non-SKYACTIV automatic Fitment/availability: Live direct OEM page identifies Mazda transmission fluid 0000-77-112E-01 at $9.03 with Add to Cart and 1-2-business-d…
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Sources for this issue (4)
P0771 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 P0771 mean on a Mazda?
P0771 stands for "Shift Solenoid E Performance/Stuck Off." This code indicates a performance problem with shift solenoid 'E', or that it appears stuck off — meaning the transmission isn't getting the gear engagement or behavior the computer commanded from that solenoid. Shift solenoids route hydraulic fluid to apply clutches and bands for specific gears, and on many transmissions solenoid E is tied to the torque converter clutch or a specific shift element. When the resulting action doesn't match the command, this code sets, often producing harsh or missing shifts, slipping, or a transmission limp mode. It generally points to the solenoid, fluid condition, or the valve body. On Mazda it is documented across 1 model: Mazda3.
What are the most common causes of P0771?
The most common causes of P0771 are: Stuck or failed shift solenoid E, Low, dirty, or degraded transmission fluid, Clogged valve body passages or sticking valve, Open, shorted, or chafed solenoid wiring, Corroded or loose transmission connector, Internal hydraulic leak or worn seals, Faulty transmission control module (TCM). The specific cause varies by vehicle.
How much does it cost to fix P0771 on a Mazda?
Published repair estimates on Mazda range from $400 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0771 on a different make?
View P0771 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.