P0843 Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit High

What does P0843 Mean?

OBD-II Code Transmission may not shift properly is defined as a Transmission Fluid Pressure Sensor/Switch "A" Circuit High

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code P0843.

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What are the common causes of P0843 ?

• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• An air leak forward of the DPF will change the sensor readings resulting in the code
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

How do you troubleshoot P0843 ?

• The most common repairs for a P0843 are as follows:
• Replacing the transmission fluid pressure sensor
• Replacing the transmission fluid pressure control solenoid
• Replacing and flushing the transmission fluid
• Repairing damaged or blocked fluid hoses

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