P0878 OBD-II: Transmission Fluid Pressure Sensor/Switch "D" Circuit High
P0878 Severity
Should you fix P0878 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 P0878?
The Transmission Fluid Pressure Sensor tells the Transmission control module (TCM) the pressure of the fluid going through the transmission. When the TCM detects an incorrect signal from the Transmission Pressure Sensor, it sends a signal to the engine control module (PCM) to set code P0878.
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OBD II Fault Code
- OBD II P0878
OBD-II Code Transmission may not shift properly is defined as a Transmission Fluid Pressure Sensor/Switch "D" Circuit High
The Transmission Fluid Pressure Sensor tells the Transmission control module (TCM) the pressure of the fluid going through the transmission. When the TCM detects an incorrect signal from the Transmission Pressure Sensor, it sends a signal to the engine control module (PCM) to set code P0878.
Transmission may not shift properly Symptoms
- Increased fuel consumption
- Transmission may not shift properly
Common Problems That Trigger the P0878 Code
- Transmission Control Module (TCM) failure
- Transmission fluid level is low
- Transmission fluid pressure sensor failure
- Wiring issue
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