P0991 code: Indicates an intermittent issue with the transmission fluid pressure sensor or switch “E” circuit, which may affect the proper functioning of the transmission system.
P0991 Transmission Fluid Pressure Sensor/Switch “E” Circuit Intermittent
Code symptoms P0991.
4 symptoms of the code P0991 Transmission Fluid Pressure Sensor or Switch “E” Circuit Intermittent may include:
– Delayed shifting or difficulty shifting gears
– Transmission slipping
– Harsh or erratic shifting
– Illuminated Check Engine Light
Causes of the code P0991.
1. Faulty transmission fluid pressure sensor or switch “E”
2. Wiring or connection issues in the circuit related to the transmission fluid pressure sensor or switch “E”
3. Low transmission fluid levels or dirty or blocked transmission filter
4. Malfunctioning transmission control module (TCM)
5. Internal transmission issues such as a failing solenoid or pressure control valve
Code Solutions P0991.
1. Check the wiring and connections to the transmission fluid pressure sensor or switch “E” for any signs of damage or corrosion. Repair or replace any damaged wires or connectors.
2. Inspect the transmission fluid pressure sensor or switch “E” itself for any damage or malfunction. Replace the sensor or switch if necessary.
3. Clear the trouble code and monitor the sensor or switch operation while driving to see if the issue is intermittent or if it occurs under specific conditions.
4. Check the transmission fluid level and condition to ensure it is at the correct level and not contaminated. Low or dirty transmission fluid can cause sensor errors.
5. If the issue persists, consider seeking assistance from a professional mechanic or dealership for further diagnosis and repair.