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)
Cadillac Escalade · 2002–2006
GMT800-era Escalades use the 4L60E/4L65E four-speed behind the 6.0L LQ9/LQ4, and in a 5,800-pound SUV the 3-4 clutch pack is the component that gives out. The 3-4 clutch apply circuit runs through a small feed and the waved snap ring and clutch plates cook under sustained load - towing, hills, or just the vehicle's weight over time. It usually starts as a flare or slip on the 2-3 shift, then the transmission stops making 3rd and 4th entirely and drives only in 1st and 2nd (or goes to limp with no movement at all). The sun shell ('Beast' shell) splintering is the other classic failure and produces loss of reverse and 2nd/4th. CarComplaints lists 'Transmission Failure' as the #1 problem on both the 2005 Escalade (avg $2,800 at 79,000 mi) and the 2006 Escalade (avg $2,800 at 77,000 mi), which is early-life failure for a truck transmission. This is a separate failure from the later 8L90 and 10-speed shift-quality complaints.
Common Symptoms
- RPM flares on the 2-3 upshift without the vehicle accelerating
- Transmission stops shifting into 3rd and 4th, drives only in low gears
- Loss of reverse along with 2nd and 4th gear
- Burnt-smelling dark transmission fluid and clutch debris on the pan magnet
- Harsh or delayed engagement into Drive or Reverse
How to Fix
Confirm with a scan and a pressure test before pulling anything. P0741 with a slipping torque converter lockup can be a solenoid or converter and does not require a rebuild; P1870 (transmission component slipping) on a 4L60E is the classic signature of the 3-4 clutch and worn valve body bores and does mean internal damage. Check fluid condition - burnt smell and black-brown fluid with clutch material on the pan magnet confirm the clutch pack is gone. Do not do a flush on a slipping unit; it will not save it and can finish it off. The correct repair is a full rebuild with upgraded internals: a 5-pinion or beast-style sun shell, an upgraded 3-4 clutch pack with additional frictions, a hardened input shaft, and a corrected valve body/servo. A rebuild that only replaces the burnt clutches with stock parts will fail again on the same schedule. Budget roughly $2,200-$3,500 for a quality rebuild or a reman unit installed. Adding an auxiliary transmission cooler is worthwhile on any Escalade that tows.
Sources for this issue (2)
Ford Maverick · 2022–2022
The 2.0L EcoBoost Maverick uses the same 8F35 eight-speed transmission found in other Ford applications (Edge, Nautilus, Transit Connect, Escape), where vehicles equipped with the 8F35 transmission may exhibit a shudder/buck/jerk while driving up to 35 mph (57 km/h) due to software in the powertrain control module (PCM) — this is documented in TSB 21-2389 for the Edge/Nautilus and is widely reported by Maverick owners as carry-over behavior. A separate but related condition involves transmission slipping concerns, harsh engagements and various clutch DTCs (sometimes with torque converter clutch DTCs), caused by worn needle bearings in the output planet carrier assembly (TSB 22-2281). Per the TSB, only 8F35 units built on or before Dec. 20, 2021 are flagged — which in practice means early 2022 model year Mavericks. Drivers typically feel a low-speed shudder under light throttle, harsh 2-3 upshifts on hills, or a flare on the 4-5 shift.
Common Symptoms
- Shudder, buck or jerk between 15-35 mph
- Harsh 2-3 upshift, especially on inclines
- Slip or flare on 4-5 upshift under light throttle
- Harsh engagement when shifting D↔R
- Metallic debris in transmission pan
- Delayed engagement when cold
How to Fix
The correction is to follow the Service Procedure steps to reprogram the PCM and the transmission solenoid strategy (labor op 212389A, ~0.9 hrs). After the adaptive strategy is reset, the computer begins a relearning process that may result in firmer than normal upshifts and downshifts for several days. If shudder persists after the reflash, the planet carrier bearings may need overhaul — early 2022 EcoBoost Mavericks built with 8F35 units before Dec. 20, 2021 are flagged for output planet carrier wear; shops keep finding slipping shifts, harsh D↔R, and metal glitter in the pan. A full overhaul per TSB 22-2281 is 16.4 hrs of labor and includes the output planetary carrier, overhaul seal kit, sun shell, and related hardware; replacement of solenoid pack/valve body and torque converter is commonly needed. Reflash cost is ~$150; a full overhaul outside warranty typically runs $3,500-$6,500, though full unit replacement can reach $8,000+.
Sources for this issue (1)
Buick Enclave · 2008–2012
Chevrolet Blazer · 2019–2024
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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.