OBD-II code · Powertrain (generic)
P0843 Transmission Fluid Pressure Sensor/Switch A Circuit High
The transmission fluid pressure sensor A circuit reports voltage above threshold, indicating short to power or open ground.
Is it safe to drive with P0843?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to battery
- PossibleOpen ground reference
- Less likelyConnector pins corroded - high contact resistance
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Transmission Fluid Pressure Sensor, Wiring Harness
Related codes
- P083DTransmission Fluid Pressure Sensor/Switch G Circuit High
- P0848Transmission Fluid Pressure Sensor/Switch B Circuit High
- P084DTransmission Fluid Pressure Sensor/Switch H Circuit High
- P0873Transmission Fluid Pressure Sensor/Switch C Circuit High
- P0878Transmission Fluid Pressure Sensor/Switch D Circuit High
- P0990Transmission Fluid Pressure Sensor/Switch E Circuit High
- P0995Transmission Fluid Pressure Sensor/Switch F Circuit High
- P0840Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
- P0841Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
- P0842Transmission Fluid Pressure Sensor/Switch A Circuit Low
- P0844Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent
- P0845Transmission Fluid Pressure Sensor/Switch B Circuit
- P0846Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.