DTC P0842, P0843 (2020)
DTC P0842 : Transmission Fluid Pressure Switch A (2nd Clutch) Circuit Low/Transmission Fluid Pressure Sensor Circuit Low Input
DTC P0843 : Transmission Fluid Pressure Switch A (2nd Clutch) Circuit High/Transmission Fluid Pressure Sensor Circuit High Input
General Description
Transmission fluid pressure sensor is installed in the hydraulic pressure circuit to the over drive clutch. When hydraulic pressure is supplied to the over drive clutch, the transmission fluid pressure sensor output is above the main regulator valve output pressure. When hydraulic pressure is not supplied to the over drive clutch, the transmission fluid pressure sensor output is low pressure. The signal from transmission fluid pressure sensor is input to the powertrain control module (PCM). The PCM detects the hydraulic pressure supply conditions at the over drive clutch to hydraulic circuit. If transmission fluid pressure sensor output voltage is a specified value for a set time, the PCM detects a transmission fluid pressure sensor failure and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 5.0 seconds or more |
| DTC Type | One drive cycle, MIL off, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| 12 volt battery voltage [Battery Voltage] | 11 V | - | |
[ ]: HDS Parameter
Malfunction Threshold
DTC: P0842
When the transmission fluid pressure sensor output voltage [Transmission Fluid Pressure Sensor] is 0.25 V or less for at least 5.0 seconds.
DTC: P0843
When the transmission fluid pressure sensor output voltage [Transmission Fluid Pressure Sensor] is 4.65 V or more for at least 5.0 seconds.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P0842
- Transmission fluid pressure sensor VCC line open (includes a loose or disconnected connector)
- Transmission fluid pressure sensor PODCL line short to ground
DTC: P0843
- Transmission fluid pressure sensor PODCL line open (includes a loose or disconnected connector)
- Transmission fluid pressure sensor SG line open (includes a loose or disconnected connector)
Common
- Transmission fluid pressure sensor failure
- PCM internal failure
Confirmation Procedure
Operating Condition
Turn the vehicle to the ON mode, and wait for at least 5.0 seconds.
With the HDS
None.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the shift position indicator blinks and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.