Error code
OBD2 P0843
OBD2P0843
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Transmission Fluid Pressure Sensor/Switch 'A' Circuit High.
Severity
moderateCan be driven, but may experience shifting problems or reduced transmission performance.
Summary
P0843 indicates that the transmission fluid pressure (TFP) sensor A is reporting an abnormally high input to the ECM/PCM/TCM, suggesting there may be a wiring issue or malfunction with the sensor itself.
Common Causes
- Wiring issues leading to a short circuit
- Faulty TFP sensor
- ECM/PCM/TCM malfunction
Fixes
- Replace the faulty TFP sensor if identified as the cause.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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