Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
The P0841 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $800 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Irregular shift quality or timing
- Transmission slipping under load
- Delayed gear engagement when accelerating
Probable Causes (Ranked by Likelihood)
- Pressure sensor A reading does not match expected values Very High
- Partially clogged transmission filter High
- Worn transmission pump reducing pressure Moderate
- Internal valve body wear causing pressure fluctuations Low
Frequently Asked Questions
What does range/performance mean for P0841?
It means the pressure sensor is providing a signal within the valid voltage range, but the actual pressure reading does not match what the TCM expects for the current operating conditions.
Should I change the transmission fluid and filter first?
Yes, a fluid and filter change is a good first step. Degraded fluid or a clogged filter can cause pressure irregularities that trigger P0841.
Can a worn transmission pump cause P0841?
Yes, a worn pump produces less hydraulic pressure than expected, which causes the sensor reading to fall outside the normal performance range.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Compare sensor A pressure reading to a mechanical pressure gauge
-
Check transmission fluid level and perform a fluid and filter change
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Monitor pressure sensor data at various RPMs and throttle positions
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Inspect for TSBs related to pressure sensor calibration for your vehicle
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2007-2017 Nissan Sentra (CVT)
- 2008-2018 Subaru Outback (CVT)
- 2010-2020 Toyota RAV4
- 2009-2019 Honda CR-V
Related Codes
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