P0845 Fault Code

Transmission Fluid Pressure Sensor/Switch B Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0845 fault code indicates an issue with the Transmission Fluid Pressure Sensor/Switch B Circuit. This sensor is critical for monitoring the transmission fluid pressure, which is essential for the proper functioning of the transmission system. When this code is triggered, it could signify that the sensor is faulty, there is a wiring issue, or a problem with the transmission itself.

What are the symptoms of the P0845 code?

Vehicles experiencing the P0845 fault code may exhibit several symptoms, such as:

• Harsh or erratic shifting patterns
• Slipping transmission
• Warning lights on the dashboard, specifically the check engine light
• Delayed or unresponsive gear changes
• Decreased fuel efficiency due to improper transmission operation

What causes the P0845 code?

Common causes of the P0845 fault code include:

• A malfunctioning transmission fluid pressure sensor
• Damaged or corroded wiring and connectors in the sensor circuit
• Low transmission fluid levels
• A faulty transmission control module (TCM)
• Internal transmission issues such as wear or damage

How to fix P0845?

To resolve the P0845 fault code, consider the following steps:

• Start by visually inspecting the wiring and connectors associated with the transmission fluid pressure sensor for any signs of damage or corrosion.
• Check the transmission fluid level and condition. Low or contaminated fluid should be replaced, and any leaks should be addressed.
• If the sensor appears to be faulty, it should be replaced with a new one to restore proper readings.
• In some cases, a scan tool may be necessary to reset the fault code and test the transmission system after repairs are made.