What Is the P0745 Code?
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Seriousness
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A code P0745 occurs when the powertrain control module (PCM) is unable to read the correct electrical voltage drops from the pressure control solenoid. Another scenario is when the PCM receives the correct electrical readings, but the pressure control solenoid is faulty.
More about the P0745 code
Many automatic transmissions have three transmission pressure control solenoids labeled A, B, and C. A P0745 OBD-II code indicates a problem with the transmission pressure control solenoid “A.” This solenoid regulates the fluid pressure inside an automatic transmission. The PCM monitors the pressure within the solenoids through electrical signals.
Since an automatic transmission comprises bands and clutches that change gears, having the correct fluid pressure is essential in maintaining its operation. The PCM correlates speed input from the vehicle and directs the pressure solenoids to apply the correct fluid pressure during gear shifts in a timely manner.
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What Are the Symptoms of a P0745 Code?
Symptoms of a P0745 code may include the following: transmission slippage during gear shifts, overheating, transmission lockups, poor fuel economy, and check engine light or limp mode activation.
Sometimes, a P0745 can keep your car from starting up or shifting gears smoothly. Another sign of trouble is the production of toxic gas emissions resulting in higher carbon monoxide and nitrous oxide levels.
What Are Some Causes of a P0745 Code?
A common cause of a P0745 code is a defective valve body or pressure solenoid. It can also be caused by faulty wiring. Another possible trigger is a dirty transmission that impedes hydraulic passage in the valves.
Most transmission solenoid malfunctions occur because of debris that obstructs the mechanical parts of the solenoid. Too many metal particles in the transmission pan could lead to transmission failure.
How Serious Is the P0745 Code?
A P0745 is a very serious condition. You won’t be able to start your vehicle, or it will fail to shift gears making driving unsafe. This should be addressed immediately.
Can I Still Drive with a P0745 Code?
A vehicle with a P0745 code is a road hazard for the driver and other road users, so driving should not be attempted. If your vehicle begins experiencing symptoms consistent with a P0745 code, then you should pull over and have it towed to a qualified mechanic for a thorough diagnosis and repair.
How Easy Is It to Diagnose a P0745 Code?
It is easy to diagnose this code if you have the proper diagnostic tools and a technical guide for the specific vehicle. If the OBD II scan reveals a P0745 code, you should document the freeze frame data before clearing the codes and simulating the conditions that triggered it.
Closely monitor the scan data to see if the PCM communicates with the pressure control solenoid. If it does not respond to the PCM signals, then this confirms the issue. The next step involves checking for continuity in the electrical flow to and from the pressure control solenoid. Assess if the reference voltages all fall within the recommended parameters.
Use a pressure gauge to examine the performance of the pressure control solenoid. Do a visual inspection of the transmission fluid. It should have a clear reddish color, resembling a watered-down cranberry juice. If it is brown or dirty, then the transmission fluid should be replaced immediately.
How Difficult Is It to Inspect a P0745 Code?
You can mistake a P0745 code for a misfiring engine or a different problem affecting your vehicle’s performance. A P0745 code may not be apparent unless you investigate further with an OBD-II scanner and proper visual inspection.
Repairing a P0745 code issue may be complex and require several hours of labor using expensive diagnostic tools. It would be best if you did thorough research before starting repairs. Professional mechanics are always recommended for complex problems like these.
Need Additional Help with Your P0745 Code?
Be more proficient in repairing your vehicle by studying Technical Service Bulletins (TSB) specific to your make and model. Ask for professional help to avoid wasting your time and get to the heart of the problem. Look for qualified experts who can quickly and effectively diagnose your vehicle.
Use Kelley Blue Book to find a repair shop in your area. This makes fixing your car easier and more convenient, no matter what the problem may be.
If you are a DIY mechanic who wants to learn more about error codes and how to fix them, then the KBB OBD-II database provides detailed information that could help you better understand your car.
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