P0756 on GMC
Shift Solenoid B Performance/Stuck Off
P0756 on GMC vehicles indicates shift solenoid b performance/stuck off. Au7o has documented this code across 1 GMC model — most commonly on Terrain. 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. Typical repair costs on GMC range from $150 to $2,800, depending on the specific model and root cause.
Common Causes of P0756
- •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
P0756 on GMC by Model
GMC Terrain(1 issue)
- 6T40/6T45 6-Speed Transmission Shudder and Harsh Shifts2010-2017
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.
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View P0756 across all makes →Frequently Asked Questions
What does P0756 mean on GMC?▼
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. On GMC specifically, this code is documented across 1 model.
What causes P0756 on GMC vehicles?▼
Common causes on GMC: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0756 on a GMC?▼
Repair costs on GMC range from $150 to $2,800, depending on the specific model and root cause.
Which GMC models have P0756 documented?▼
Au7o has documented P0756 on 1 GMC model: Terrain.