P0746 Code - Pressure Control Solenoid 'A' Performance or Stuck Off

What does P0746 Mean?

OBD-II Code P0746 is defined as a Pressure Control Solenoid "A" Performance/Stuck Off

The Transmission Control Module (TCM) uses Pressure Control Solenoids to control the hydraulic pressure in the transmission which is needed to apply the various clutch packs in the transmission that provide the different gear ratios needed to efficiently propel the vehicle down the roadways. When the TCM detects a pressure control solenoid is not performing as desired, it will set code P0746.

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What are the common causes of P0746 ?

• Faulty IMRC actuator/sensor
• A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
• An air leak forward of the DPF will change the sensor readings resulting in the code

How do you troubleshoot P0746 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0746 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.

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