P0846 Fault Code

Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance

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

The P0846 fault code indicates an issue with the Transmission Fluid Pressure Sensor/Switch B Circuit. This sensor measures the pressure of the transmission fluid and sends this data to the engine control module (ECM) to help regulate shifting and ensure efficient transmission performance. When the circuit performance is out of range, it can trigger this fault code.

What are the symptoms of the P0846 code?

Symptoms associated with a P0846 code may include:

• Erratic shifting patterns or harsh shifts.
• Slipping transmission.
• Delayed engagement when shifting from park to drive.
• Transmission overheating.
• Warning lights illuminated on the dashboard, such as the check engine light.

What causes the P0846 code?

Common causes of a P0846 fault code include:

• Faulty transmission fluid pressure sensor.
• Damaged wiring or connectors in the sensor circuit.
• Low transmission fluid levels or fluid leaks.
• Faulty engine control module (ECM).
• Issues with the transmission control module (TCM).

How to fix P0846?

To resolve a P0846 fault code, follow these steps:

1. Inspect the transmission fluid level and condition, and refill or change if necessary.
2. Check for any damaged wiring or connectors related to the transmission fluid pressure sensor.
3. Test the transmission fluid pressure sensor for proper operation and replace it if it's faulty.
4. Clear the fault codes and test drive the vehicle to ensure the issue is resolved.
5. If the problem persists, further diagnose the ECM or TCM for faults.