Engine Error
P0840
Transmission Fluid Pressure Sensor/Switch A Circuit
Severity
High
Symptoms
Harsh shifting, delayed engagement, transmission slipping
Common Causes
- Faulty Transmission Fluid Pressure (TFP) sensor
- Low transmission fluid level
- Damaged wiring harness
- Failed line pressure control solenoid
How to Fix
- 1 Check and fill transmission fluid
- 2 Replace TFP sensor/switch
- 3 Repair wiring
- 4 Test and replace pressure control solenoid
Estimated Repair Cost
USD
$100
–
$600
TFP sensor replacement: $150 - $400