P0844 Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit Intermittent

What does P0844 Mean?

The PCM has detected an abnormality in the transmission fluid pressure sensor circuit. The computer controlled automatic transmission uses varying degrees of hydraulic pressure to provide shift actuation and torque converter lockup. Pressure is regulated using one or more electronic pressure control solenoids which are controlled by the PCM.

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What are the common causes of P0844 ?

A faulty electronic pressure control solenoid, blockage within the fluid passages of the transmission, a bad transmission fluid pressure sensor, a low fluid condition, dirty transmission fluid, a mechanical failure of the transmission, or even a faulty PCM or Transmission Control Module (TCM) are some common causes for the storage of a P0844 trouble code.



How do you troubleshoot P0844 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0844 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.

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