Engine Error
P0842
Transmission Fluid Pressure Sensor/Switch A Circuit Low
Severity
High
Symptoms
Transmission slipping, harsh shifts, check engine light
Common Causes
- Short to ground in TFP sensor A circuit
- Defective TFP sensor
- Low transmission fluid pressure
- Failed TCM
How to Fix
- 1 Trace and repair shorted wire
- 2 Replace TFP sensor A
- 3 Test transmission line pressure mechanically
- 4 Diagnose TCM
Estimated Repair Cost
USD
$100
–
$500
Sensor replacement: $150 - $400