P0749 Code - Pressure Control Solenoid 'A' Intermittent

What does P0749 Mean?

The PCM has detected an abnormality in the electronic pressure control solenoid circuit. The computer controlled automatic transmission uses varying degrees of hydraulic pressure to provide shift actuation and torque converter lockup.

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What are the common causes of P0749 ?

• Some aftermarket accessories and performance modifications
• A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

How do you troubleshoot P0749 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0749 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

Searches related to P0749 Code - Pressure Control Solenoid 'A' Intermittent

• P0749
• P0748