P0847 Fault Code

Transmission Fluid Pressure Sensor/Switch B Circuit Low

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

The P0847 fault code indicates an issue with the Transmission Fluid Pressure Sensor/Switch B circuit, which is functioning at a lower voltage than expected. This can lead to poor transmission performance and potential long-term damage if not addressed. The role of the fluid pressure sensor is crucial in monitoring the pressure within the transmission, helping the vehicle's computer adjust shifting and ensure proper operation.

What are the symptoms of the P0847 code?

Vehicle symptoms associated with the P0847 code may manifest as:

• Erratic or harsh shifting of the transmission.
• Slipping of the transmission during operation.
• Warning lights illuminated on the dashboard, commonly the check engine light.
• Unusual noises from the transmission area, such as grinding or whining.
• Decreased fuel efficiency due to unoptimized transmission operation.

What causes the P0847 code?

Common causes of the P0847 fault code may include:

• A faulty Transmission Fluid Pressure Sensor/Switch B.
• Damaged or frayed wiring in the sensor circuit.
• Poor electrical connections or corrosion in the circuit.
• Low transmission fluid levels or dirty fluid affecting sensor functioning.
• A malfunctioning engine control module (ECM) misinterpreting sensor input.

How to fix P0847?

To resolve the P0847 fault code, it is advisable to follow these steps:

• Begin with a thorough inspection of the Transmission Fluid Pressure Sensor/Switch B and its wiring for any signs of damage.
• Replace the faulty sensor if found defective.
• Repair or replace any damaged wiring or connectors.
• Check and, if necessary, top off or change the transmission fluid to ensure it meets specifications.
• Clear the fault code from the vehicle's computer and conduct a test drive to see if the issue persists.