P0868 on GMC
Transmission Fluid Pressure Low
P0868 on GMC vehicles indicates transmission fluid pressure low. Au7o has documented this code across 1 GMC model — most commonly on Acadia. This code indicates the transmission's internal fluid pressure is reading lower than the computer expects for current operating conditions. The transmission control module uses a pressure sensor to monitor line pressure, which is what applies the clutches and bands that engage gears. When that pressure stays below the target threshold, P0868 sets. Low line pressure can cause slipping, harsh or delayed shifts, and in severe cases internal clutch damage, so it should be addressed promptly.
Common Causes of P0868
- •Low transmission fluid level
- •Worn or stuck-open pressure control solenoid
- •Internal leak (worn seals, gaskets, or valve body)
- •Faulty transmission fluid pressure sensor
- •Clogged transmission filter
- •Failing transmission (oil) pump
- •Worn or leaking valve body
- •Wiring or connector fault to the pressure sensor/solenoid
P0868 on GMC by Model
GMC Acadia(1 issue)
- Start/Stop Transmission Accumulator Missing Bolts - Fluid Leak, Loss of Propulsion and Fire Risk (Recall 20V668 / N202313440)2019-2020
NHTSA campaign 20V668 covers certain 2019-2020 GMC Acadia vehicles. The start/stop transmission-accumulator endcap may be missing bolts, which can cause an oil leak and loss of transmission function and may increase fire risk.
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View P0868 across all makes →Frequently Asked Questions
What does P0868 mean on GMC?▼
P0868 stands for "Transmission Fluid Pressure Low." This code indicates the transmission's internal fluid pressure is reading lower than the computer expects for current operating conditions. The transmission control module uses a pressure sensor to monitor line pressure, which is what applies the clutches and bands that engage gears. When that pressure stays below the target threshold, P0868 sets. Low line pressure can cause slipping, harsh or delayed shifts, and in severe cases internal clutch damage, so it should be addressed promptly. On GMC specifically, this code is documented across 1 model.
What causes P0868 on GMC vehicles?▼
Common causes on GMC: Low transmission fluid level, Worn or stuck-open pressure control solenoid, Internal leak (worn seals, gaskets, or valve body), Faulty transmission fluid pressure sensor, Clogged transmission filter. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0868 on a GMC?▼
Repair costs vary widely depending on the root cause and specific GMC model.
Which GMC models have P0868 documented?▼
Au7o has documented P0868 on 1 GMC model: Acadia.