P0847 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P0847 indicates a fault in Transmission Fluid Pressure Sensor/Switch B Circuit Low, typically within transmission and shift management.

Symptoms

gear hunting
transmission warning message
harsh or delayed shifting

Common causes

Disconnected or loose connector affecting transmission fluid pressure sensor/switch b circuit low
Open circuit in wiring
Connector pin damage/corrosion or harness stress near related components

How to diagnose P0847

Confirm P0847 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to transmission fluid pressure sensor/switch b circuit low for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P0847

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P0847?

Most vehicles can be driven short-term with P0847, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the transmission fluid pressure sensor/switch b circuit low circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P0847 remains cleared under the conditions that originally set the code.

Fix options

Clear corrosion and protect terminals.
Repair open circuit and secure connector lock.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$300-$1500

Common mistakes when diagnosing P0847

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P0847 in common vehicles

P0847 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P0847?

P0847 is commonly set by open faults affecting transmission fluid pressure sensor/switch b circuit low.

How much does it cost to fix P0847?

For P0847, repair costs are typically $300-$1500 depending on exact root cause, labor rates, and part quality.

Can I clear P0847 without repair?

You can clear P0847 temporarily, but the code usually returns until the underlying fault is corrected.