P0747 OBD-II Trouble Code: Pressure Control Solenoid Stuck On

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Cost of diagnosing the P0747 code

P0747 is a diagnostic trouble code (DTC) for "Pressure Control Solenoid Stuck On". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
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P0747 code definition

The PCM will store the P0747 code when an abnormal reading from the electronic pressure control solenoid, or the related circuit, is detected.

What the P0747 code means

In order to monitor gear shift changes and fluid pressure in the transmission, the PCM relies on data from the pressure control solenoid. If the transmission pressure doesn’t align with the manufacturer’s specifications, it is likely that the gear shift operation will not perform correctly. In this case, the PCM will store the P0747 code.

What causes the P0747 code?

A faulty electronic pressure control solenoid is the most likely cause of this code; however, other causes may include:

  • Blocked transmission fluid passages
  • Low transmission fluid
  • Dirty or contaminated transmission fluid
  • Faulty electrical components, such as wiring, connectors, or harnesses, within the circuit
  • Internal transmission failures

What are the symptoms of the P0747 code?

Symptoms of the P0747 code might be completely unobservable. However, some vehicle owners may experience:

  • Disabled shifting function or harsh shifting
  • Torque converter clutch that does not engage or disengage
  • Slipping or overheating transmission
  • Decreased fuel efficiency
  • Illuminated Check Engine lamp

How does a mechanic diagnose the P0747 code?

After an OBD-II scanner detects the P0747 code, a technician will perform a thorough visual inspection of the transmission fluid. If it is low, it should be refilled; if the fluid is dirty, contaminated with debris, or smells like it is burnt, the entire system needs to be flushed, and refilled with clean fluid.

At each step, the mechanic should be sure to clear the code from the PCM and retest the system; if the code does not reappear, it’s likely that the issue has been resolved, and no further repairs will be necessary. After performing this task, the mechanic should inspect all electrical components, repairing or replacing any wiring or connectors as necessary. The technician should then continue diagnosing the pressure control components until the fault is discovered.

Common mistakes when diagnosing the P0747 code

The most common mistake that technicians report with the P0747 code is replacing the high pressure pump, when the solenoid or the electrical wiring are more commonly to blame.

How serious is the P0747 code?

Because this code relates directly to the operation of the shifting function, it is considered a high-priority issue that should be repaired as soon as possible. If the issue behind the P0747 code is not addressed immediately, it can cause major malfunctions.

What repairs can fix the P0747 code?

Addressing a P0747 code detection may include any of the following repairs:

  • Replace a faulty electronic pressure control solenoid
  • Clear blocked transmission fluid passages
  • Refill low or dirty transmission fluid
  • Repair or replace faulty electrical components within the circuit
  • Correct any internal transmission failures

Need help with a P0747 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.

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P0747
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Anthony

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Anthony
6 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Carmichael, California
Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!

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37 years of experience
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Michael
37 years of experience
Subaru Forester - Check Engine Light is on - Santa Fe Springs, California
Michael was punctual and courteous. He knows what he’s doing and I would absolutely recommend him to anyone.

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

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19 years of experience
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Breck
19 years of experience
Ram 1500 - Check Engine Light is on - Houston, Texas
Breck did a great job working on my truck. Showed up on time, found any issues I had on my truck and explained everything to me so that I understood what was going on. Went above and beyond, definitely will book him for future appointments.


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