P0776: How to Diagnose & Fix — Pressure Control Solenoid B Performance/Stuck Off
18 vehicles · 9 makes · $150-$8,000 repair
How to diagnose and fix P0776: 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.
GMC Terrain · 2010–2017
The 2010-2017 Terrain uses the GM 6T40 (2.4L) and 6T45 (V6) 6-speed automatic transmissions, both of which suffer from torque converter shudder, harsh shifts, and solenoid failures. The shudder occurs at light throttle between 30-50 mph when the torque converter clutch locks up. Solenoid pack wear causes P0756, P0751, and P0776 transmission fault codes. The transmission is sensitive to fluid condition — the 6T40/6T45 was originally filled with Dexron VI, but older Dexron VI degrades faster than newer formulations.
Common Symptoms
- Shudder at light throttle 30-50 mph
- Harsh 1-2 or 2-3 upshift
- Hesitation or lurch when pulling away from a stop
- Transmission fault codes P0756, P0751, P0776
- Check engine light
- Delayed engagement from Park to Drive when hot
How to Fix
Full fluid exchange with Dexron VI (ACDelco 10-9243 or equivalent). TCM calibration update. Solenoid pack replacement (GM 24272814) if codes present. Valve body replacement for internal failures. Fluid service every 40,000 miles recommended for stop-and-go use.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Dexron VI full-synthetic automatic transmission fluidOEMACDelco 10-9243 (GM 88865549)Cross-refValvoline DEXRON VI ATF 822405, Mobil 1 Synthetic ATF Dexron VI 112980, Castrol Transmax DEXRON-VI 03520C$8–$15
Dexron VI is required — do NOT substitute Dexron III or a universal/multi-vehicle ATF, as the friction
- Control solenoid valve assembly (valve body + solenoids + TEHCM) — 2.4L, 2012-2013OEM24041960$600–$960
THIS is the part that actually fixes P0751/P0756/P0776 on the 6T40/6T45. GM does not sell the individual shift/pressure-control solenoids for this transmission as a serviceable part — the solenoids are integrated into the TEHCM/valve bod…
- Control solenoid valve assembly (valve body + solenoids + TEHCM) — 2.4L, 2014-2017OEM24041961$598–$915
Same function as 24041960 but the correct number for the later 2.4L Terrain — this is the year split, so do not cross-order between them.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
Cadillac STS · 2005–2011
The GM 6L50 6-speed automatic transmission in V6-equipped STS models is prone to overheating and developing harsh shift quality. The transmission fluid cooler is undersized for the vehicle weight, and the valve body solenoids degrade from heat cycling. Fluid darkens rapidly, and shift quality deteriorates with delayed or slipping 3-4 and 5-6 upshifts. The torque converter clutch also fails prematurely from heat damage.
Common Symptoms
- Harsh or delayed 3-4 upshift
- Transmission fluid dark or burnt smell by 50,000 miles
- Transmission temperature warning
- Torque converter shudder at 40-50 mph light throttle
- Slipping in higher gears under load
How to Fix
Perform a complete transmission fluid and filter change (not a flush) every 30,000 miles using Dexron VI. Install an auxiliary transmission cooler for vehicles used in hot climates or towing. If shifts are already harsh, a valve body rebuild or replacement with updated solenoids may be required. Torque converter replacement is needed if shudder is present.
Sources for this issue (1)
Opel Insignia · 2008–2017
The Aisin AF40 6-speed automatic in Insignia A (2008-2017) develops harsh shifts, shudder during lock-up, and delayed engagement, typically by 100,000-160,000 km. Root cause is degraded ATF and worn solenoids; Opel's "lifetime fill" claim is widely disputed.
Common Symptoms
- harsh shifts
- shudder at light throttle
- delayed engagement
- limp mode
How to Fix
Drain-and-fill ATF every 60,000 km using Aisin JWS3309 / Dexron VI-compatible fluid (~€150-€250 DIY). Solenoid pack replacement if shifts remain harsh (€500-€900). Full mechatronic / valve body rebuild €1,500-€2,500. Severe shudder may indicate torque converter wear.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Aisin ATF-93001 AW-1 transmission fluid 1 L
Confirm VIN, transmission tag, quantity and level procedure.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Infiniti QX55 · 2022–2024
Hyundai Sonata · 2011–2019
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P0776 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 P0776 mean?
P0776 stands for "Pressure Control Solenoid B Performance/Stuck Off." This code means the transmission's Pressure Control Solenoid B is not performing correctly and is behaving as if stuck in the 'off' position. Pressure control solenoids regulate the hydraulic fluid pressure used to apply clutches and bands and to control shift quality, so when one underperforms the transmission may shift harshly, slip, flare between gears, or feel inconsistent. The transmission control module sets this code when the fluid pressure or response it measures doesn't match what it commanded from that solenoid. It generally indicates a hydraulic performance issue with the solenoid or its fluid circuit rather than just a wiring fault.
What are the most common causes of P0776?
The most common causes of P0776 are: Stuck or failed pressure control solenoid B, 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 wear or pressure loss, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P0776?
Repair costs for P0776 range from $150 to $8,000, depending on the vehicle and root cause.
Which vehicles are affected by P0776?
Au7o has documented P0776 across 18 vehicle models from 9 manufacturers: Buick, Cadillac, Chevrolet, Ford, GMC, Hyundai, Infiniti, Nissan, Opel.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.