P0841 on Buick: How to Diagnose & Fix
Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance
1 Buick model · 1 documented issue · 1 critical · $4,500-$7,800 repair
P0841 on Buick by model: symptoms, diagnosis and fix
Separate from the well-known low-speed shudder, the VT40 continuously variable transmission suffers hard failures of the line-pressure control solenoid circuit. When the solenoid sticks off, the belt-and-pulley set loses clamping pressure, the transmission cannot transmit torque, and the vehicle abruptly stops accelerating - owners describe engine RPM climbing with no forward motion, or being unable to exceed 20 mph with the pedal floored, sometimes on a highway. Failures are reported between roughly 40,000 and 83,000 miles, and multiple NHTSA complaints describe a second failure after an earlier transmission replacement. Some units have been found with essentially no fluid in the sealed case at teardown.
Common Symptoms
- Vehicle will not accelerate past ~20 mph with pedal fully depressed
- Engine revs but vehicle does not move
- Delayed engagement when shifting into Drive or Reverse
- Loud whine or mechanical noise from the transaxle
- Sudden jerk followed by loss of drive at highway speed
- Speedometer rising and falling erratically
How to Fix
Do not clear the code and keep driving; continued operation with low line pressure destroys the belt and pulleys. Retrieve P2714/P0700 and check line pressure and fluid condition. In GM practice this is almost always resolved by transmission replacement or a remanufactured unit rather than a solenoid-only repair, because by the time the code sets the variator surfaces are already damaged. Insist on documentation of the fluid fill and level check on the replacement unit, since dry-at-delivery units have been reported. Verify powertrain warranty coverage (5yr/60,000 mi) before authorizing repair.
Sources for this issue (3)
P0841 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 P0841 mean on a Buick?
P0841 stands for "Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance." This powertrain code means the transmission computer detected the 'A' transmission fluid pressure sensor or switch reading out of its expected range or not matching actual operating conditions. This sensor converts hydraulic line pressure into an electrical signal the computer uses to manage shift timing and quality. An out-of-range reading can cause incorrect shift behavior, harsh or slipping shifts, or limp mode. It should be addressed to prevent drivability problems and possible transmission damage. On Buick it is documented across 1 model: Encore GX.
What are the most common causes of P0841?
The most common causes of P0841 are: Low or contaminated transmission fluid, Faulty transmission fluid pressure sensor/switch, Wiring or connector problems in the sensor circuit, Clogged filter or restricted fluid passages, Worn valve body or internal pressure control fault, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0841 on a Buick?
Published repair estimates on Buick range from $4,500 to $7,800 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 P0841 on a different make?
View P0841 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.