P0841: Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
Can you still drive? Yes, but shift quality may be affected. The transmission may shift too harshly or too softly depending on how the pressure readings are off. Get it diagnosed within a week or two.
What Does P0841 Mean?
Code P0841 means the transmission fluid pressure sensor A is reporting readings that are outside the expected range for the current operating conditions. This sensor monitors hydraulic line pressure inside the transmission, which the TCM uses to adjust shift firmness and clutch apply pressure. Inaccurate readings can cause the TCM to apply incorrect pressure, leading to harsh or soft shifts.
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An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty transmission fluid pressure sensor
- Wiring issue in pressure sensor circuit
- Low transmission fluid level affecting pressure
- Worn transmission pump not producing correct pressure
- Clogged transmission filter restricting flow
Symptoms
- Check engine light on
- Harsh or soft shifting
- Delayed gear engagement
- Transmission slipping under certain conditions
- Inconsistent shift quality
Diagnostic Steps
- 1Check transmission fluid level and condition
- 2Read freeze frame data noting line pressure readings during fault
- 3Monitor pressure sensor A readings with scan tool across all operating conditions
- 4Compare sensor reading to actual line pressure using a mechanical gauge
- 5Inspect sensor wiring and connector for damage
- 6Replace transmission filter if clogged and retest
Recommended Parts & Tools
transmission fluid pressure sensor
transmission fluid
transmission filter kit
line pressure gauge
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $800 |
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Frequently Asked Questions
What is a transmission fluid pressure sensor?
It is a sensor mounted on or inside the transmission that measures the hydraulic line pressure. The TCM uses this data to ensure the correct amount of clamping force is applied to clutch packs during shifts.
Can low fluid cause P0841?
Yes. Low transmission fluid reduces hydraulic pressure, which can cause the pressure sensor to report out-of-range values. Always check the fluid level first when diagnosing this code.
Is P0841 common on Subaru vehicles?
Yes, P0841 is frequently reported on Subaru CVT transmissions. Subaru has issued technical service bulletins for some models addressing pressure sensor and valve body issues related to this code.
Community Fix Reports
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