P0841 code meaning
Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
Powertrain system Generic code P08xx codes Check engine light
What P0841 means
Transmission fluid pressure sensor/switch A and B are inputs inside the automatic gearbox. A switch only reports pressure present or absent, a sensor reports a value. The letter is the maker's choice: Allison 1000 uses A and B for the switches on shift valves S1 and S2, GM's CVT for the primary and secondary pulley sensors, GM's 2025 8-speed A for the lube pressure sensor; Ford reports pressure faults under its solenoid codes instead. P0841 means the signal is electrically fine but does not match the commanded state. GM's CVT sets it when pulley pressure misses its target by more than 500 kPa steady or 1500 kPa transient while the ratio is off by over 0.2 for about 6 s, type A. GM's 8-speed checks the lube sensor rises above 40 kPa after start-up; Mitsubishi's CVT sets it at 0.675 MPa deviation for 5 s.
P0841 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0841
- Check engine or transmission warning lamp on
- Shift shock, slipping or delayed engagement
- CVT: ratio and power limited
Common causes of P0841
- Most likelyDirty or sticking valve, worn valve body
- Most likelyPressure sensor or switch drifting or sticking
- PossibleFluid level low, fluid aged or filter clogged
- PossibleMechanical damage: thrust washer, CVT belt or pulley, pump
- Less likelyControl module software
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission fluid pressure sensorTransmission valve bodyTransmission wiringTransmission control module
What each part of P0841 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| 41 | The exact fault in that area. |
What to do next
- Note P0841 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0841
What does P0841 mean?
P0841 means "Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance". Transmission fluid pressure sensor/switch A and B are inputs inside the automatic gearbox. It is a generic code, so it means the same on every make.
Is it safe to drive with P0841?
Drive gently and only to a workshop. With P0841 the car can go into limp mode (reduced power) to protect itself.
Will P0841 fail an emissions test?
Yes, it can. P0841 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0841 to fix?
Difficulty: hard. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0841 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.