Engine Error
P0843
Transmission Fluid Pressure Sensor/Switch A Circuit High
Severity
High
Symptoms
Limp mode, erratic upshifts, MIL illuminated
Common Causes
- Short to battery voltage in TFP sensor A circuit
- Failed TFP sensor
- Broken ground wire
- Excessive line pressure due to stuck valve
How to Fix
- 1 Repair short to voltage
- 2 Replace Transmission Fluid Pressure Sensor
- 3 Fix ground connection
- 4 Clean or rebuild valve body
Estimated Repair Cost
USD
$100
–
$800
Sensor: $150 - $400; Valve body work: $400 - $800