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 having trouble reading the pressure of the transmission fluid. It's like trying to read a book with missing pages.
The P0846 code is triggered when the transmission control module (TCM) detects a problem with the transmission fluid pressure sensor/switch B, which monitors the hydraulic pressure within the transmission.
P0846 indicates an issue with the transmission fluid pressure sensor/switch B circuit. This sensor is responsible for providing the TCM with data about the hydraulic pressure in the transmission. If the sensor's readings are outside of the expected range or performance criteria, the TCM will set this code.
• Check Engine Light is on
• Transmission slipping
• Harsh or erratic shifting
• Faulty transmission fluid pressure sensor/switch
• Wiring issues or poor electrical connections
• Low transmission fluid levels or contaminated fluid
TCM: Transmission Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code
• Inspect the transmission fluid level and condition
• Check wiring and connections to the sensor
• Replace the transmission fluid pressure sensor/switch
• Repair or replace damaged wiring
• Flush and refill the transmission fluid
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Honda Accord
• Toyota Camry
• Ford F-150
• Regularly check and maintain transmission fluid levels
• Perform scheduled transmission services
• Inspect wiring for wear and tear
Sensor Issue
• Avoid heavy towing until the issue is resolved
• Drive gently to prevent further damage
Check if your vehicle's powertrain warranty covers transmission components.
This code has been commonly reported in vehicles with high mileage or poor maintenance history.
Moderate – It should be addressed soon to avoid potential transmission damage.
Driving with transmission issues can be unsafe and may cause further damage.
• Engine running
• Transmission at operating temperature
The transmission fluid pressure sensor is typically located on the transmission body.
Q: Can I drive with a P0846 code?
A: It's not recommended to drive for long periods with this code, as it may lead to transmission damage.
Q: How do I reset the P0846 code?
A: After repairs, the code can be reset using an OBD-II scanner.
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