P0796 on Buick: How to Diagnose & Fix
Pressure Control Solenoid 'C' Performance or Stuck Off
1 Buick model · 1 documented issue · 1 critical · $2,500-$4,500 repair
P0796 on Buick by model: symptoms, diagnosis and fix
The first-generation Enclave (built 2008-2017) uses the 6T70/6T75 6-speed automatic, whose stamped-steel 35R wave plate can crack at the teeth after enough shift cycles. When it fractures, the transmission abruptly loses 3rd, 5th, and reverse gears, and debris can damage the valve body, drums, and torque converter. GM's bulletin and special coverage for this failure cover 2008-2009 Enclaves.
Common Symptoms
- Sudden loss of 3rd, 5th and reverse gears
- Slipping or no movement
- Harsh or no shifts
- Check engine / transmission warning light
How to Fix
Disassemble and rebuild the transmission with an updated/stronger wave plate, plus replace damaged hard parts and clean out debris; in severe cases a remanufactured unit is installed.
Sources for this issue (2)
P0796 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 P0796 mean on a Buick?
P0796 stands for "Pressure Control Solenoid 'C' Performance or Stuck Off." This generic transmission code means the TCM/PCM detected that pressure control solenoid 'C' is not regulating hydraulic pressure as expected, or appears stuck in the off position. These solenoids control the line pressure that applies the transmission's clutch packs to achieve the correct gear ratios, so a performance fault here disrupts shift quality. Symptoms can include harsh or delayed shifts, slipping, or limp mode, and continued driving can accelerate transmission wear. On Buick it is documented across 1 model: Enclave.
What are the most common causes of P0796?
The most common causes of P0796 are: Faulty pressure control solenoid C, Low, dirty, or degraded transmission fluid, Blocked or restricted valve body fluid passages, Damaged wiring or connector to the solenoid, Worn valve body or stuck valve, Internal transmission mechanical wear, Faulty TCM/PCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0796 on a Buick?
Published repair estimates on Buick range from $2,500 to $4,500 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.
Looking for P0796 on a different make?
View P0796 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.