P0848 Transmission fluid pressure sensor or switch B is reporting a high input

Transmission fluid pressure sensor/switch B high input

Severity not verified — if the car runs badly, have it inspected

The sources define the code and list causes but do not say whether you can keep driving, so we do not rate it. Owner complaints for this code describe poor acceleration with other codes stored.

Source: how we rate severity

P0848 in short

P0848 means the transmission control computer sees a high signal from fluid pressure sensor or switch B. TroubleCodes.net lists a wiring fault, a short to positive voltage, the sensor itself, or the control module as the causes. No source tells us whether it is safe to keep driving, so have it scanned for other codes.

Automatic transmissions measure fluid pressure with a sensor or switch so the control computer can tell the clutches are applying as commanded. P0848 is set when the B sensor or switch reports a high input.

TroubleCodes.net lists wiring trouble, a short to positive voltage, a bad sensor or switch, and the control module as the possible causes, and does not rank them.

A 2016 Honda Odyssey owner reported a scan tool showing P0848 as a faulty transmission fluid pressure switch, alongside a cylinder 1 misfire code. A second Odyssey owner and an Acura RDX owner also reported the code; the second reports do not describe what it meant. Acura has a 2003-2004 MDX bulletin that names P0848 and P0873.

Most likely causes

  1. Wiring fault or short to positive voltage in the sensor circuit

    Common general cause
    Why it ranks here
    TroubleCodes.net lists wiring first, and a short to positive is what produces a high input reading.
    What would change this
    Rises if the harness is chafed or the connector is damaged or wet. Falls if the circuit tests normal.

  2. Transmission fluid pressure sensor or switch B failed

    Supported by vehicle data
    Why it ranks here
    TroubleCodes.net names the sensor, and the Honda Odyssey owner's readout describes the code as a faulty fluid pressure switch.
    What would change this
    Rises if the circuit and wiring test good and the reading stays high. Falls if wiring faults are found.

  3. Transmission, powertrain or engine control module fault

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net lists the control module last, as a cause to consider after the sensor and wiring.
    What would change this
    Rises if wiring and sensor test good. Falls if either is faulty.
    How to test the transmission control module (tcm)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes and freeze-frame data from the engine and transmission control modules, using a scanner that can read the transmission.

    Low riskTool: OBD-II scan tool that reads transmission modules

    • IfOther transmission pressure or solenoid codes are stored with P0848

      It meansLook for a shared wiring or connector fault.

      Go to step 2

    • IfP0848 is the only code

      It meansCheck the sensor circuit.

      Go to step 2

  2. Have a shop inspect the sensor connector and harness for damage, moisture or a short to positive, and test the sensor signal against the manufacturer's specification.

    Best left to a shopTool: multimeter, scan tool with live data

    Warning:Probing a live control module or sensor connector can short pins and damage the transmission computer; leave this to a shop.

Symptoms

  • Check engine light
  • Sluggish acceleration or hesitation
  • Shifting trouble Gets more serious: stop and have it checked.

How to fix

  1. Have the transmission pressure sensor circuit tested with a scanner that can read the transmission module, and repair any wiring or connector fault before replacing parts.

On your vehicle

Honda

  • 2016 · Odyssey

    Supported by vehicle data

    Two owners of 2016 Odysseys reported P0848. One had a scan readout describing a faulty transmission fluid pressure switch, with a cylinder 1 misfire code. These are owner reports, not a confirmed cause.

Acura

  • 2003–2004 · MDX

    Supported by vehicle data

    An Acura bulletin lists P0848 and P0873 for the MDX automatic transmission. Only the NHTSA summary was read, and whether it is still current is not verified.

  • 012012003Status unverified

    A/T DTC P0848 or P0873

    2003–2004mdx · NHTSA 10014347

    The NHTSA summary names P0848 and P0873 and does not describe the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P0848 yet.

All Transmission codes

Sources and review

  1. P0848 - Transmission Fluid Pressure (TFP) Sensor B - High Input — TroubleCodes.net
  2. NHTSA complaint ODI 11437861: 2016 Honda Odyssey scan readout — NHTSA Office of Defects Investigation
  3. NHTSA complaint ODI 11620350: 2016 Honda Odyssey P0848 scan — NHTSA Office of Defects Investigation
  4. Acura MDX 2003-2004: A/T DTC P0848 or P0873 — NHTSA (manufacturer technical service bulletin summary)
Last reviewed
Written by
Saurabh K.
Editorial review
Pending
Technician review
Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

My Car

Pick your car and code pages will point out notes and bulletins for it. Saved only in this browser.

Fill this in from your VIN

Used once to identify your engine; not stored.