P0963 Code - Pressure Control Solenoid 'A' Control Circuit High

What does P0963 Mean?

OBD-II Code Transmission may not shift properly is defined as a Pressure Control Solenoid "A" Control Circuit High

The Transmission Fluid Pressure Solenoid 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 electrical circuit to or from this solenoid, the PCM or TCM will set code P0963.

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What are the common causes of P0963 ?

• An air leak forward of the DPF will change the sensor readings resulting in the code
• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• Fuel with a large percentage of sulfur will clog the DPF quickly

How do you troubleshoot P0963 ?

Potential repairs for the P0963 trouble code are:

• Replacement of the valve A pressure control solenoid
• Replacement of the wires and connectors in the system
• Replacement of high pressure pumps
• Replacement or addition of transmission fluid
• Removal of hydraulic blockages from the transmission
• In rare cases, replacement of the transmission
• In very rare cases, replacement of the PCM or transmission control module

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