Transmission Fluid Pressure Sensor/Switch B Circuit High
The P0848 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Sensor/Switch B Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $500 (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 P0848?
- Check Engine Light illuminated
- Firm or harsh shifts
- Transmission may not shift smoothly
- Possible limp mode
What Causes P0848? (Most Likely First)
- Open ground wire at pressure sensor B Very High
- Faulty pressure sensor B stuck high High
- Short to voltage in sensor B signal wire Moderate
- TCM reference voltage problem Low
Can I Still Drive with P0848?
Short distances only. P0848 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
Is P0848 the counterpart to P0847?
Yes, P0847 is the low circuit code and P0848 is the high circuit code for the same pressure sensor B. They indicate opposite types of electrical faults.
Can a high reading cause transmission damage?
If the TCM believes pressure is higher than it actually is, it may reduce solenoid output, leading to insufficient actual pressure and clutch slippage.
How do I find pressure sensor B on my vehicle?
Consult your vehicle service manual. Sensor B is typically mounted on the transmission case or valve body, often on the opposite side or different location from sensor A.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0848?
-
Measure voltage at pressure sensor B connector with key on
-
Check for an open ground at the sensor
-
Test for short to battery voltage on the signal wire
-
Replace sensor B if circuit checks are normal
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 P0848?
- 2007-2017 Nissan Rogue (CVT)
- 2010-2020 Subaru Outback (CVT)
- 2008-2018 Honda Odyssey
- 2009-2019 Toyota Highlander
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