Error Code P0748 is defined as Pressure Control Solenoid A Electrical. This is a generic trouble code, meaning it applies to all cars with the OBD-II system, especially those made since 1996 up to present and equipped with automatic transmission. This includes cars from, but not limited to, Acura, Allison/Duramax, Chevrolet, Dodge, Ford, Honda, Jeep, Lincoln, Mercury, Jaguar, Toyota, etc. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another.
When Error Code P0745 I set, that means the PCM (powertrain control module, also known as ECM or engine control module in other 2010 Ferrari 612 Scaglietti makes) has determined a problem with the Transmission Pressure Control Solenoid “A”. Most cars equipped with automatic transmission comes with at least three solenoids (solenoid A, B, and C). Trouble codes related to “A” solenoid include:
These codes are based on a specific malfunction that alerts the PCM and activates the Check Engine light.
The job of the Transmission Pressure Control Solenoid is to control the pressure of the fluid for its right operation of the automatic transmission. The PCM gets an electronic signal based on the pressure with the solenoids. Automatic transmissions are controlled by bands and clutches that changes gears using fluid pressure in the right place, at the right time. Based on the signals coming from associated devices that monitor your 2010 Ferrari 612 Scaglietti ’s speed, the PCM controls the pressure solenoids to direct fluids at the appropriate pressure, to various hydraulic circuits that change transmission gear ratio at the right time.
Error Code P0748 is set when the Pressure Control Solenoid “A” is experiencing an electrical malfunction.
In severe cases, your 2010 Ferrari 612 Scaglietti cannot be driven when this code appears. Other common symptoms include:
Defective valve body or pressure control solenoid are the two most common causes of this code. In many cases, your 2010 Ferrari 612 Scaglietti may also be suffering from defective wiring. Other possible causes include:
Before starting with any troubleshooting process, it’s important to check the with 2010 Ferrari 612 Scaglietti ’s TSB (Technical Service Bulletins), specific to its year, model, and transmission. In some cases, this can help save a lot of time, as it points you in the right direction. Also, it pays to check your 2010 Ferrari 612 Scaglietti ’s records to verify the last time the fluid and filter was changed.
First, check the transmission fluid’s condition and level. Before this, you can consult with your 2010 Ferrari 612 Scaglietti ’s records to verify the last time the fluid and filter was changed.
For the wirings, it’s obvious. Make sure the connectors and connections are secured, and there are no signs of damages and corrosions. This includes inspecting all wirings and connectors to the transmission pressure control solenoids, transmission pump, and PCM. Depending on the configuration, the transmission pump can be electrically or mechanically driven.
These steps may vary from one 2010 Ferrari 612 Scaglietti to another, and requires advanced equipment to perform, such as digital multi-meter and specific technical references for your 2010 Ferrari 612 Scaglietti . You will need the specific troubleshooting guidelines for your 2010 Ferrari 612 Scaglietti prior to proceeding with this kind of diagnosis.
Also, remember that voltage conditions may vary based on the model of your 2010 Ferrari 612 Scaglietti . Fluid pressure requirements can also vary based on the design and configuration of the transmission.
Unless it was specified in the technical data, the normal resistance reading for connections and wirings is 0 ohms. Continuity check should be performed with the power removed from the circuit to avoid shorting the circuit and doing more damage. Resistance or no continuity is a sign of faulty wiring, which may be open or shorted, and must be repaired, if not replaced.
Depending on the diagnosis, common repairs for this problem include:
This code is considered a serious problem in most cases, as it can keep your 2010 Ferrari 612 Scaglietti from being driven.
The most common misdiagnosis for this code includes engine misfire problem, internal transmission problem, transmission pump problem, and driveline problem. Thus, a thorough diagnosis is important, especially in the valve body or solenoid.