The P0843 trouble code indicates that the transmission fluid pressure sensor or switch “A” circuit is reporting a high voltage condition. Here’s what you should know:
P0843 Transmission Fluid Pressure Sensor/Switch “A” Circuit High
Code symptoms P0843.
1. Difficulty shifting gears.
2. Transmission slipping or jerking during gear changes.
3. Overheating of the transmission.
4. Illumination of the Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) on the dashboard.
Causes of the code P0843.
1. Faulty transmission fluid pressure sensor or switch.
2. Excessive transmission fluid pressure.
3. Short circuit in the sensor circuit.
4. Corrosion or damage to wiring or connectors in the sensor circuit.
5. Internal transmission problems.
6. Faulty transmission control module (TCM).
Code Solutions P0843.
1. Replace the transmission fluid pressure sensor or switch if it’s found to be faulty.
2. Repair or replace any damaged wiring or connectors in the sensor circuit.
3. Check and adjust the transmission fluid level if it’s too high.
4. Address any internal transmission issues if detected.
5. Check and, if necessary, replace the transmission control module (TCM) if other issues are ruled out.