P0844 Fault Code

Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent

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

The P0844 code indicates an issue with the transmission fluid pressure sensor or switch A, which may be causing an intermittent problem with the circuit. This sensor plays a crucial role in gauging the pressure of the automatic transmission fluid, helping the engine control module (ECM) determine when to shift gears and maintain optimal transmission performance. When this code is triggered, it suggests that the sensor is sending inconsistent signals to the ECM, which can result in poor transmission behavior.

What are the symptoms of the P0844 code?

Drivers may notice a variety of symptoms if the P0844 code is present, such as:

• Erratic shifting or delayed engagement of gears.
• Increased engine RPMs without corresponding acceleration.
• Warning lights on the dashboard, including the Check Engine Light.
• Potential overheating of the transmission if fluid pressure is not managed properly.

What causes the P0844 code?

Several factors can lead to the P0844 code being set, including:

• A faulty transmission fluid pressure sensor or switch A.
• Damaged wiring or poor electrical connections in the sensor circuit.
• Low transmission fluid levels or fluid contamination.
• Internal transmission issues affecting fluid pressure.
• Faulty ECM or a software glitch.

How to fix P0844?

To resolve a P0844 code, follow these steps:

1. Inspect the wiring and connectors for the transmission fluid pressure sensor to ensure they are intact and free of corrosion.
2. Check the transmission fluid level and condition; top off or replace as needed.
3. Test the transmission fluid pressure sensor using a multimeter to ensure it is functioning correctly.
4. If the sensor is faulty, replace it.
5. Clear the fault codes and conduct a road test to confirm that the issue is resolved.