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P0745 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

Pressure Control Solenoid Malfunction

Meaning

Code P0745 indicates that the powertrain control module (PCM) fails to measure the correct electrical voltage drops produced by the pressure solenoid. In some cases, your PCM may read the correct electrical readings, but the Pressure Control Solenoid may not be performing as it should.

Causes

Possible causes of the transmission code P0745 include:

P0745 codes are typically caused by a malfunctioning valve body or pressure solenoid. Likewise, your vehicle's pressure solenoid may be defective or have poor wiring. The hydraulic passages of the car can be restricted or inhibited by a clogged transmission.

Symptoms

P0745 trouble codes can cause the following symptoms:

  • The vehicle goes into limp mode 
  • When shifting, the transmission slips 
  • Overheating of the transmission 
  • In gear, transmission jams 
  • Fuel economy decreased 
  • Symptoms of misfires may be present 
  • Check Engine Light on

Diagnosis

When diagnosing a P0745 error, the freeze frame must always be recorded. Do a test drive at your vehicle's freeze frame speed to simulate these code-setting conditions. Accelerate slowly after stopping. Verify that your PCM is ordering the Pressure Control Solenoid by scanning the scan data. You can determine if the problem lies in the fact that the PCM commands the Pressure Control Solenoid at a higher duty cycle and the transmission refuses to perform properly. The next step is to begin performing continuity tests and voltage drop tests for the solenoid. Using a pressure gauge, you should test the pressure control solenoid's performance if the electrical tests are within the recommended parameters. Ensure that the fluid is always in good condition. Almost like watered-down cranberry juice, the consistency should be clear red. Replace your fluid as soon as it appears burnt, brown, or dirty.

Common mistakes

P0745 can sometimes be mistaken for a misfiring engine or a problem with your vehicle's performance by technicians. It was a defective valve body or solenoid that caused the issue, rather than a problem with the driveline.

How serious is this?

A moderately severe code can quickly become more severe if not corrected as quickly as possible.

What repairs can fix the code?

The following are common fixes for this error code:

  • Removing and changing the filter and fluid 
  • Inspect and replace defective parts 
  • Troubleshoot or replace the transmission pump if the pressure control solenoid is broken 
  • The transmission valve body needs to be repaired or replaced 
  • To clean the passages, flush the transmission 
  • Corrosion on connectors must be removed 
  • Wiring or PCM replacement Flashing or PCM replacement

Related codes

None listed.

Conclusion

If you have P0745 code on your vehicle, it may be time to have your vehicle inspected by a professional. Take your car in for service as soon as possible to avoid a more severe problem.