P0842 OBD-II: Transmission Fluid Pressure Sensor/Switch "A" Circuit Low
P0842 Severity
Should you fix P0842 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0842?
The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code P0842.
What Does P0842 Code Mean?
OBD-II Code P0842 is defined as a Transmission Fluid Pressure Sensor/Switch "A" Circuit Low
The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code P0842.
P0842 Symptoms
- Increased fuel consumption
- Transmission may not shift properly
Common Problems That Trigger the P0842 Code
- Transmission Control Module (TCM) failure
- Transmission fluid level is low
- Transmission fluid pressure sensor failure
- Wiring issue
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