Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. Diagnostic Trouble Code (DTC): P0751 Shift Solenoid A Performance or Stuck Off/1-2 Shift Solenoid Valve Performance

Diagnostic Trouble Code (DTC): P0751 Shift Solenoid A Performance or Stuck Off/1-2 Shift Solenoid Valve Performance

Check Engine Light

P0751 code definition

The P0751 code indicates that the car’s computer has noted a malfunction or incorrect operation with shift solenoid A.

What the P0751 code means

Automatic transmissions use solenoids to move fluid through interior channels and create the pressure needed to change gears. The P0751 code means that there has been a problem with shift solenoid A, as opposed to shift solenoid B, which would be indicated with a P0755 code. If the computer detects a difference in the actual gear ratio as compared to the gear ratio predicted by the engine speed, throttle position and other factors, it will set the P0751 code.

What causes the P0751 code?

As with the P0755 code, there are multiple potential causes for the P0751 code. These include the following:

  • Faulty shift solenoid A
  • Internal blockages in the transmission preventing fluid from flowing
  • Low transmission fluid
  • Dirty or contaminated transmission fluid
  • Internal mechanical transmission failure
  • Failed PCM (rare)
  • Failed TCM (rare)

What are the symptoms of the P0751 code?

The symptoms of the P0751 code mirror those of the P0755 code, and include the following:

  • No discernible symptoms
  • Transmission slipping
  • Harsh shifting
  • Transmission overheating
  • Reduced fuel efficiency
  • Check Engine light on
  • Inability to shift into or out of gear
  • Transmission stuck in “limp-home” mode

How does a mechanic diagnose the P0751 code?

Diagnosing the cause of the P0751 code begins by connecting an OBD II scanner to the car’s communication port. The mechanic will read all the codes stored in the computer and then clear them. A test drive is necessary to make sure the code resets.

Next, the mechanic should check the transmission fluid level. If it is low, it will need to be topped off and the car test driven again. If the fluid is burned or contains finings or other contamination, an inspection of the fluid in the pan will be required, and it may indicate the need for a transmission rebuild.

If the problem is not fluid related, the mechanic will need to inspect the shift solenoid wiring harness, connections and circuit for damage or corrosion. If the problem does not lie in these areas, the shift solenoid itself will need to be tested.

Common mistakes when diagnosing the P0751 code

Most commonly, mechanics will replace shift solenoid A without conducting a full diagnosis. While a failed solenoid is often the culprit, there are other factors that must be ruled out. Often, low transmission fluid is the problem.

How serious is the P0751 code?

The P0751 code is very serious, as it can affect the drivability of your car and can lead to serious transmission damage and high replacement costs if not handled promptly. Have the problem diagnosed as soon as possible.

What repairs can fix the P0751 code?

Repairing the P0751 code may require a number of different fixes depending on the actual underlying problem. They include:

  • Topping off the transmission fluid
  • Draining and refilling the transmission fluid
  • Replacing shift solenoid A
  • Repairing or replacing the wiring harness
  • Cleaning corrosion from connections

Additional comments for consideration regarding the P0751 code

Determining an accurate diagnosis for the P0751 code can require a significant amount of testing and inspection. However, it is essential that a mechanic not simply replace shift solenoid A immediately, as this can lead to an expensive repair that does not solve the problem. A full diagnosis must be provided, including inspecting the wiring harness and connections.

Need help with a P0751 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
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...
P0359 OBD-II Trouble Code: Ignition Coil I Primary/Secondary Circuit Malfunction
P0359 code definition The P0359 code indicates that a fault has been detected in one of the vehicle’s ignition coils, generally the number 9 coil. This code can also be associated...


Related questions

Q: The Check Engine Light came up with the code P2017, what do I need to replace?

If you are getting this code it is due to one of two things. The vast majority of the time it is caused by a failure in the variable charge motion actuator, which is the same part that you mentioned....

Q: my car check engine light suddenly blinking and after sometime car starts vibrating. Is this a serious issue. what should i do now

The Check Engine Light is blinking most likely because the engine is misfiring in one or more cylinders. You will need to have the computer system tested to see what code was stored. The code can then be diagnosed to...

Q: What are these codes that appeared on my car?

These codes are related to the engine sensors for mass air flow, idle air control, and the throttle position sensor. It is quite likely, given your mileage, that their sensors have become dirty/clogged, or the sensors have failed. You don't...