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P0756 OBD-II Trouble Code: Shift Solenoid B Performance or Stuck Off/2-3 Shift Solenoid Valve Performance

Check Engine Light

P0756 code definition

If a vehicle’s PCM (Powertrain Control Module) records a trouble code of P0756, it’s because the solenoid is stuck.

What the P0756 code means

Solenoids are common throughout every modern vehicle and are a deceptively simple and vital component necessary for it to work. A solenoid is just a cylindrical coil of wire. It’s used as a magnet for carrying electric current which should help explain why contemporary automobiles use so many. Code P0756 means that the vehicle’s PCM sensed an irregularity in shift solenoid B, which is located in the transmission. As a computer-controlled transmission, shift solenoids are used to manage how fluid is transferred from hydraulic circuit to hydraulic circuit. This transfer is how a change in gear occurs in an automatic transmission.

Therefore, these solenoids make it possible to change speed, get better fuel efficiency and, basically, ensure the highest level of engine performance. That’s why the PCM pays attention to how shift solenoids are operating. These solenoids determine gear ratio based on engine load, throttle position, vehicle speed and engine speed.

What causes the P0756 code?

There are a number of causes that could be behind this code appearing. They are:

  • Hydraulic blockages occurring inside the fluid passages of the internal transmission
  • Low amounts of transmission fluid
  • Failures having to do with the mechanical aspects of the internal transmission
  • Dirty transmission fluid It’s also worth pointing out that the actual computers could be wrong. The PCM or the vehicle’s transmission control module could both be at fault, though this tends to be pretty rare.

What are the symptoms of the P0756 code?

Despite how important solenoids are to the operation of an automobile, a P0756 code can be logged without any noticeable symptoms tipping off the driver. That being said, some very clear signs may manifest as well. These would be things like:

  • A complete inability to shift into any gear
  • Transmission overheating
  • Transmission slippage
  • Harsh shifting
  • Decreased fuel efficiency You may also find that a number of other trouble codes related to shift solenoids are logged as well. Sometimes, the transmission controller will go into “limp-in” mode as well in order to protect the vehicle. This will make it very difficult to drive other than at a very slow pace.

How does a mechanic diagnose the P0756 code?

Diagnosing the issue isn’t difficult. A mechanic will:

  • Use an OBD-II scanner to find out which trouble codes have been recorded.
  • Check shift solenoid B for any problems and replace it if necessary
  • Check the relevant wiring
  • Change out the transmission fluid

Common mistakes when diagnosing the P0756 code

Solenoid B may need to be replaced, but it’s a mistake to do so and then assume the problem is solved. All four of the above steps must be followed to get to the root of the issue or it might just reappear in a matter of months.

How serious is the P0756 code?

Although the owner may not even realize that solenoid B is not working correctly, this is still a pretty serious problem. For one thing, it could easily evolve into something far worse if not treated in a timely manner. Any time your gears aren’t working correctly, the entire transmission is at risk. Furthermore, though it won’t put your life in danger, if solenoid B isn’t doing its job, your vehicle is probably going to be impossible to drive, especially if it goes into limp-in mode.

What repairs can fix the P0756 code?

Usually, replacing the solenoid or its wiring will be enough. Otherwise, changing out the transmission fluid will often do it.

Additional comments for consideration regarding the P0756 code

Even if you can manage to shift gears, if you know there is a problem with any solenoid related to your transmission, you don’t want to push it. Your problem could go from being a minor annoyance to dangerous while you’re on the road.

Need help with a P0756 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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