P0751 on Subaru: How to Diagnose & Fix
Shift Solenoid A Performance/Stuck Off
1 Subaru model · 1 documented issue · $150-$1,500 repair
P0751 on Subaru by model: symptoms, diagnosis and fix
Subaru Service Bulletin 16-86-12 (12/11/2012) covers 2013 Tribecas with the EZ36D and 5-speed automatic, along with the 2013 Legacy and Outback. On these vehicles the AT OIL TEMP lamp comes on with one or more stored solenoid and pressure-control DTCs: P0751, P0756, P0761, P0766, P0771 or P1840-P1844. Subaru traced it to TCM logic. The fix went into production in mid-November 2012 starting at Tribeca VIN D*400781. Earlier 2013 Tribecas with TCM part numbers 30919AB190/191/192 are affected. The bulletin's applicability is written for low-mileage vehicles (6,000 miles or less).
Common Symptoms
- AT OIL TEMP lamp on or flashing on the dash
- Stored transmission solenoid DTCs
How to Fix
Have a Subaru technician check the current bulletin and calibration. TSB 16-86-12 is expressly limited to low-mileage (6,000 miles or less) 2013 5AT vehicles with the listed codes. For an applicable Tribeca, it specifies TCM calibration 30919AB193, memory clear, ATF drain/refill with pan and magnet cleaning, then Dynamic Check Mode on a workshop lift, not an owner road-test cycle. If the symptom persists after that procedure, it specifies valve-body replacement. Its warranty labor allowance is 1.2 hours for the combined reprogramming and ATF flush; it is not a current retail quote or extended warranty. An older, higher-mileage vehicle needs diagnosis before applying this low-mileage remedy.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (2)
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 on a Subaru?
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 Subaru it is documented across 1 model: Tribeca.
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 on a Subaru?
Published repair estimates on Subaru range from $150 to $1,500 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.