My service engine light is on, I had the code checked and it said line pressure solenoid. how do I find out which one is bad and where are they located

PO 748
service the transmission .....check solenoids

- Dirty transmission fluid - Low transmission fluid level - Faulty line pressure solenoid valve 'A' - Line pressure solenoid valve 'A' harness is open or shorted - Line pressure solenoid valve 'A' circuit poor electrical connection

Read more: http://www.autocodes.com/p0748.html

P0108
is the code for a problem with the MAP electrical circuit sensor having too high voltage input to the Engine Control Unit (ECU). This means that the voltage input to the ECU is too high and that it is not in the correct range for proper engine operation to work with inputs from the Mass Air Flow Sensor (MAF) and Throttle Position Switch (TPS). P0108 OBD II Trouble Code Manifold Air Pressure MAP Barometric Pressure...


odyssey map sensor is on the throttle body

Map sensor

P0745 - Pressure Control Solenoid Malfunction Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty line pressure solenoid valve
- Line pressure solenoid valve harness is open or shorted
- Line pressure solenoid valve circuit poor electrical connection Help with this
Tech notes
When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.
Help with this
When is the code detected?
The P0745 is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
P0745 Description
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).
TURBO BOOST PRESSURE SOLENOID VALVE DIESEL VAUXHALL MOVANO VIVARO RENAULT...

is there any service engine soon light? - usually a bad throttle position sensor or idle air control valve - your local auto parts store can read your ses codes and go from there

P1782 DODGE - 2/4-OD Pressure Switch Circuithttp://engine-codes.com/p1782_dodge.htmlForum CodePossible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty 2/4-OD Pressure Switch
- 2/4-OD Pressure switch poor electrical connection
- 2/4-OD Pressure switch circuit is open or shorted
Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shockP1782 DODGE Description The pressure 2/4-OD Pressure Switch is part of the pressure switch of the transmission. The pressure switch are located in the solenoid assembly. The switch provide input information to the Transmission Control Module (TCM). The switch will inform to the TCM is pressure exist in a specified hydraulic circuit. the TCM uses this information to verified that the solenoids are working or not.
P0755 DODGE - 2/4 Solenoid Circuithttp://engine-codes.com/p0755_dodge.htmlForum CodePossible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty 2/4 solenoid valve
- 2/4 solenoid valve harness is open or shorted
- 2/4 solenoid valve circuit poor electrical connection
P0700 DODGE - Transaxle Control System Malfunctionhttp://engine-codes.com/p0700_dodge.htmlForum CodePossible causes- Shorted or open circuit within transmission control module (TCM)
- Failure of transaxle control module Tech notes Since the P0700 is just and informative code, check the TCM for more codes to resolve the problem.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Driveability problems
- Transaxle shifting problems

P1441 CHEVROLET Description The Engine Control Module (ECM) has detected vacuum flow to the Fuel Tank Pressure (FTP) sensor during a system sealed condition. Possible causes are a faulty canister purge solenoid or a faulty tank pressure sensor.

Read more: http://engine-codes.com/p1441_chevrolet.html#ixzz21ZntUMpS

The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

These are both EVAP emissions codes. The first thing I would do is open the fuel door and take a good wiff. If you smell gas replace the fuel cap.

If you don't smell gas the next thing you can do is visually inspect all the EVAP hoses and lines for cracks or holes. The EVAP system consists of a purge solenoid, a charcoal canister, a vent solenoid, a fuel tank pressure sensor, and misc. lines and hoses. All of these will need to be visually checked for damage.

If you don't see anything with a visual check than the next step would be to have the EVAP system smoke checked for leaks. A smoke machine will be used to slightly pressurize the EVAP system with smoke. Where ever the smoke comes out is where is is leaking.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

P0775 - Pressure Control Solenoid B Malfunction

The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). The P0775 is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

Possible Causes:
- Faulty line pressure solenoid B valve
- Line pressure solenoid B valve harness or connectors
- Line pressure solenoid B valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

Do you have a check engine light on? The line pressure is too high in the transmission. This is either from a bad epc solenoid in the transmission or the computer commanding the pressure high from a bad MAF. If you have a bad MAF you should have other MAF (Mass Airflow Sensor) codes in the computer.

if that was the code for the purge vent solenoid i would say it is bad since you smell fumes. because that solenoid allows the vacuume from the engine while it is running to pull the excess fumes from the fuel tank and burn them off inside the engine. also might want to check lines under the hood associated with the solenoid to make sure excess air pressure from the fumes building up didn't blow a vac. line off. i would also check the condition of your fuel cap, if it doesn't seal good it could also cause a similar problem.