Transmission Fluid Pressure Sensor/Switch H Circuit
The P2855 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Sensor/Switch H Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $900 (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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What Are the Symptoms of P2855?
- Harsh shifting
- Transmission slipping
- Check Engine Light on
- Delayed gear engagement
What Causes P2855? (Most Likely First)
- Faulty transmission fluid pressure sensor H Very High
- Wiring issue in pressure sensor H circuit High
- Low or contaminated transmission fluid Moderate
- TCM internal fault Low
Can I Still Drive with P2855?
Short distances only. P2855 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does pressure sensor H monitor?
Pressure sensor H monitors hydraulic pressure in a specific transmission circuit used for clutch or band application.
Can low fluid cause this?
Yes, low transmission fluid can cause incorrect pressure readings that trigger this code.
Is this a common failure?
Pressure sensors can fail over time due to heat and contamination, especially in high-mileage vehicles.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2855?
-
Scan for DTCs and check fluid level
-
Monitor pressure sensor H readings
-
Inspect sensor wiring and connector
-
Compare pressure readings to specifications
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)
Which Vehicles Commonly Get P2855?
- 2010-2020 Toyota Camry
- 2012-2019 Honda Accord
- 2014-2020 Nissan Altima
- 2011-2020 Chevrolet Malibu
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