Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0843
DTC P0843:Â Transmission Fluid Pressure Sensor/Switch "A" Circuit High
General DescriptionÂ
The CVT driven pulley pressure sensor uses a strain gauge. The output voltage changes depending on the driven pulley pressure. The powertrain control module (PCM) sends a 5 V reference voltage to the sensor through a pull-up resistor. When the driven pulley pressure is low, the sensor resistance decreases and the PCM detects a low signal voltage. Conversely, when the driven pulley pressure is high, the sensor resistance increases and the PCM detects a high signal voltage. If the CVT driven pulley pressure sensor signal voltage is a specified voltage for a set time, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD StatusÂ
| Execution | Continuous |
| Sequence | None |
| Duration | 10 seconds or more |
| DTC Type | Two drive cycles, MIL off, A/T gear position indicator blinks |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
Enable ConditionsÂ
| Condition | Â |
|---|---|
| State of the engine | Running |
| No active DTCs set (prevents monitor from running) | P0842 |
Malfunction ThresholdÂ
The CVT driven pulley pressure sensor output voltage [Driven Pulley Pressure Sensor (V)] is more than 4.84 V for at least 10 seconds.
[ ]: HDS Parameter
Possible CauseÂ
NOTE:Â The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- CVT driven pulley pressure sensor PDN line open (includes connector loose connection or disconnection)
- CVT driven pulley pressure sensor failure
- PCM internal circuit failure
Confirmation ProcedureÂ
Operating ConditionÂ
- Start the engine.
- Shift to P, and wait for at least 10 seconds.
- Turn the vehicle to the OFF (LOCK) mode.
- Repeat Driving Pattern steps 1 through 2.
With the HDSÂ
None.
Diagnosis DetailsÂ
Conditions for setting the DTCÂ
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTCÂ
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.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.