Powertrain
generic / SAE
P0842
Transmission Fluid Pressure Sensor/Switch A Circuit Low
The transmission fluid pressure sensor A circuit reports voltage below threshold, indicating short to ground or sensor failure.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number8 / 42
Possible causes
- Signal shorted to ground high
- Sensor failed medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–900 €
- Estimated time: 1–4 h
- Component: transmission fluid pressure sensor
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012