Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is getting a signal that the pressure of the fluid in the transmission is lower than it should be. It's like when you're blowing up a balloon and it's not getting enough air.
The transmission fluid pressure sensor/switch B is responsible for monitoring the pressure of the transmission fluid. If the sensor or switch detects that the pressure is too low, it triggers the P0847 code.
The P0847 code is set when the Powertrain Control Module (PCM) detects a low voltage signal from the transmission fluid pressure sensor/switch B. This sensor is used to ensure that the transmission fluid pressure is within the required range for optimal transmission performance.
• Check Engine Light is on
• Transmission slipping
• Poor fuel economy
• Harsh or erratic shifting
• Faulty transmission fluid pressure sensor/switch
• Low transmission fluid level
• Wiring issues or poor electrical connections
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Check the transmission fluid level and condition.
• Inspect the wiring and connectors for damage or corrosion.
• Test the transmission fluid pressure sensor/switch B.
• Use a scan tool to check for additional codes.
• Refill or replace transmission fluid if necessary.
• Repair or replace damaged wiring or connectors.
• Replace the transmission fluid pressure sensor/switch B.
• Reprogram or replace the PCM if needed.
• OBD-II scanner
• Multimeter
• Transmission fluid pressure gauge
$150 - $400
Moderate
• Honda Accord
• Toyota Camry
• Ford F-150
• Regularly check and maintain transmission fluid levels.
• Inspect wiring and connectors periodically.
• Service the transmission as recommended by the manufacturer.
Sensor Issue
• Have the vehicle inspected by a professional if you notice transmission issues.
• Avoid driving the vehicle if the transmission is slipping.
Check with your vehicle manufacturer to see if the transmission components are covered under warranty.
The P0847 code is commonly associated with transmission issues and has been reported in various models, particularly those with automatic transmissions.
Moderate – It is important to address this issue soon to prevent further transmission damage.
Ignoring this code may lead to unsafe driving conditions and potential transmission failure.
• Vehicle should be at operating temperature.
• Transmission should be in gear.
The transmission fluid pressure sensor/switch is typically located on the transmission housing.
Q: Can I drive with a P0847 code?
A: It's not recommended to drive with this code as it can lead to transmission damage.
Q: How do I reset the P0847 code?
A: After repairs, the code can be reset using an OBD-II scanner.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.