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P0844 is a diagnostic trouble code (DTC) for "Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The storage of a P0844 trouble code means that the Powertrain Control Module (PCM) has detected a deviation in the voltage signal received from the transmission fluid pressure sensor circuit. Some related codes include P0840, P0841, P0842, P0843, P0845, P0846, P0847, P0848, and P0849.
The PCM uses data from the transmission fluid pressure sensor/switch to determine if the right amount of pressure is present for proper vehicle operation. When the pump pressure varies from what is needed, a P0844 trouble code is stored and the Check Engine light illuminates.
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.
The symptoms of a P0844 trouble code range from no obvious signs to the inability to shift properly, and even a failure of the torque converter to work properly. Some other common symptoms of a P0844 trouble code include difficulty in shifting, transmission overheating, and a reduction in the vehicle's fuel efficiency. Also, when this code is stored, some PCMs can place the vehicle transmission into Limp-in mode.
Mechanics need an advanced scanner, digital volt/ohmmeter, manual pressure gauge, a hydraulic pressure diagram, and a manufacturer's wiring diagram to properly diagnose a P0844 trouble code. In addition to this equipment, the mechanic should perform the following steps:
Often, mechanics erroneously replace a high pressure pump in response to this code when the problem actually lies with the transmission pressure sensor, electronic pressure control solenoid, or faulty wiring. This misdiagnosis of the problem usually results in the code returning.
The seriousness of a P0844 trouble code can range from not serious at all to an inoperable vehicle that fails to shift properly, if at all. A driver of a vehicle that has a stored P0844 trouble code should have the problem diagnosed and fixed as soon as possible to avoid any potential issues.
To repair a P0844 trouble code, the mechanic should do the following:
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