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.
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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
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
-
Inspect for TSBs related to pressure sensor calibration for your vehicle
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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