P0796 on GMC
Pressure Control Solenoid 'C' Performance or Stuck Off
P0796 on GMC vehicles indicates pressure control solenoid 'c' performance or stuck off. Au7o has documented this code across 1 GMC model — most commonly on Acadia. 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. Typical repair costs on GMC range from $1,800 to $4,500, depending on the specific model and root cause.
Common Causes of P0796
- •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)
P0796 on GMC by Model
GMC Acadia(1 issue)
- 6T70/6T75 3-5-Reverse Wave Plate Fracture — Loss of 3rd, 5th and Reverse2007-2012
The 35R clutch wave plate inside the 6T70/6T75 six-speed transaxle cracks and fractures, allowing the 35R clutch piston to overstroke and leak apply pressure. The result is a hard flare or slip in 3rd and 5th gear and eventually a complete loss of reverse. Failures typically begin after about 25,000 miles and are extremely common on the early Lambda Acadia; GM eventually extended coverage on the wave plate to 10 years/120,000 miles. Debris from the broken plate circulates through the transmission, so a simple plate swap is often not enough on high-mileage units.
Looking for P0796 on a different make?
View P0796 across all makes →Frequently Asked Questions
What does P0796 mean on GMC?▼
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 GMC specifically, this code is documented across 1 model.
What causes P0796 on GMC vehicles?▼
Common causes on GMC: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0796 on a GMC?▼
Repair costs on GMC range from $1,800 to $4,500, depending on the specific model and root cause.
Which GMC models have P0796 documented?▼
Au7o has documented P0796 on 1 GMC model: Acadia.