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P0749 OBD-II Trouble Code:Transmission Fluid Pressure Solenoid Intermittent

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P0749 trouble code definition

A P0749 trouble code is related to a vehicle’s automatic transmission and its fluid pressure control solenoid.

What the P0749 code means

P0749 is an OBD-II generic code for a voltage problem with the transmission fluid pressure control solenoid and its signal being sent to the engine computer. The solenoid helps control transmission fluid pressure, an intermittent one may not allow the appropriate pressure for shifting.

What causes the P0749 code?

While there could be a number of causes for a P0749, the most common are:

  • Faulty transmission fluid pressure control solenoid
  • Dirty or contaminated transmission fluid
  • Low transmission fluid
  • Internal/external transmission line blockages

What are the symptoms of the P0749 code?

Intermittent issues usually point to an actual mechanical problem so chances are high a P0749 will also cause poor transmission performance such as slipping, harsh shifts and failure to shift.

How does a mechanic diagnose the P0749 code?

Your mechanic will first ensure there is a sufficient amount of transmission fluid as well as the fluid condition. If it is low or dirty, it will need to be changed and flushed. The pressure control solenoid will then be visually inspected and tested to confirm it is faulty.

Common mistakes when diagnosing the P0749 code

With any transmission related trouble code, dirty or low fluid could be the route cause of the problem and you should never overlook the possibility of internal damage.

How serious is the P0749 code?

A transmission may not shift properly with a faulty pressure control solenoid, which amps up the seriousness of this code.

What repairs can fix the P0749 code?

The most common repairs for a P0749 are as follows:

Additional comments for consideration regarding the P0749 code

Any repair that has to deal with automatic transmission fluid should also involve a change and flush of the fluid itself.

Need help with a P0749 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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