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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...

Related questions

Q: check engine light code p0068

The definition for the code P0068 is throttle body airflow performance. A few more things will have to be checked as this code can come from a failing sensor that is offering the computer improper signals. Consider hiring one of...

Q: Engine Light and AT light. Car goes into limp mode

Hello. Most of the time this is the result of a transmission failure. It is common for this transmission to have internal pressure problem which will cause these codes. It can also be a voltage problem so I always check...

Q: Oil leak and Check Engine Light is on

Hi there. Thanks for writing in. In some cases, the oil leaking from the vehicle after a rear main seal and oil cooler are repaired is caused by residual oil that was not cleaned or removed from the vehicle after...