P0756: How to Diagnose & Fix — Shift Solenoid B Performance/Stuck Off
13 vehicles · 7 makes · $150-$6,500 repair
How to diagnose and fix P0756: 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)
Pontiac Grand Prix · 2001–2008
The exact corpus supports 4T65-E shift and failure conditions throughout the frozen 2001-2008 range, but not one cause. Examples include P0756/P0757 shift faults, P0741/P0742 TCC paths, pressure-control and valve-body work, second-clutch shudder, V8 torque-converter conditions, slips/no drive/reverse and code-specific valve-body reconditioning (including 10025065 for 2001-2008). The frozen accumulator, clutch-pack, solenoid and pan-magnet explanation collapses distinct unit/RPO, calibration, hydraulic, electrical and mechanical paths.
Common Symptoms
- transmission RPO identified
- codes and operating conditions captured
- fluid, debris, cooler flow and pressure checked
- electrical, hydraulic, converter and clutch paths separated
How to Fix
Identify the transmission by VIN/RPO and capture codes, freeze-frame, commanded/actual gear, shift timing and temperature. Inspect fluid/debris, cooler flow and line pressure, then follow the code- and unit-specific tree before solenoid, valve-body, converter, clutch or unit replacement. Do not buy a solenoid, valve body, clutch kit, accumulator, magnet or transmission from this page; unit/RPO, failed path, calibration, part number and VIN fitment must be established first.
Sources for this issue (2)
Chevrolet Malibu · 2013–2016
The 2013-2016 Malibu with the 2.5L Ecotec engine uses the GM 6T40 6-speed automatic transmission that develops a pronounced shudder during light acceleration in the 25-45 mph range. The torque converter clutch wears prematurely, causing slippage and vibration that feels like driving on rumble strips. Harsh 1-2 and 2-3 shifts are also common. The 6T40 is sensitive to fluid condition and the issue worsens rapidly if the fluid is not changed on schedule.
Common Symptoms
- Shudder or vibration at 25-45 mph under light throttle
- Harsh 1-2 and 2-3 upshifts
- Transmission hesitation or delayed engagement
- Rumble strip sensation during gentle acceleration
- Shudder disappears under hard acceleration
How to Fix
Perform a full transmission fluid exchange with ACDelco DEXRON VI ATF — a drain-and-fill three times (drive 500 miles between each) is most effective. If fluid change alone does not resolve the shudder, the torque converter needs replacement ($800-$1,500 including labor). GM released TCM software updates that modify shift points to reduce harsh shifting — ask the dealer for the latest calibration. Avoid aggressive driving until the issue is resolved, as continued torque converter slippage generates damaging heat.
Sources for this issue (1)
Lincoln Aviator · 2020–2023
Ford Maverick · 2022–2022
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P0756 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 P0756 mean?
P0756 stands for "Shift Solenoid B Performance/Stuck Off." This code means the transmission control module commanded Shift Solenoid B (sometimes called Shift Solenoid 2) to operate, but the transmission did not respond as expected, with the solenoid behaving as if it is stuck in the 'off' position. Shift solenoids are electrically controlled valves that route transmission fluid pressure to engage the correct gears, so a stuck or weak solenoid can cause harsh, delayed, or missed shifts. The computer sets this code when the actual gear ratio or shift timing does not match what it commanded. It generally points to a hydraulic or electrical performance problem inside the automatic transmission rather than a simple wiring short.
What are the most common causes of P0756?
The most common causes of P0756 are: Stuck or failed Shift Solenoid B, Low, dirty, or degraded transmission fluid, Clogged solenoid or valve body passages from debris, Worn or sticking valve body components, Wiring or connector fault to the solenoid, Internal transmission wear or mechanical damage, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P0756?
Repair costs for P0756 range from $150 to $6,500, depending on the vehicle and root cause.
Which vehicles are affected by P0756?
Au7o has documented P0756 across 13 vehicle models from 7 manufacturers: Buick, Cadillac, Chevrolet, Ford, GMC, Lincoln, Pontiac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.