Check engine light came on. 3 codes appear. One was for the transmission control switch. Mechanic says that the control switch might be causing the other two to codes to appear. Car seems to be stuck in 2nd gear. At 25 mph, rpm is around 3500 and will not shift into the next gear

This applies to trouble code p07e8. Most likely, the check engine light has also appeared. This code indicates that there is a problem with the Volume or Mass air flow sensor. If the engine light is also on, it is due to a misreading of the sensor. If the part is faulty, it will need to be replaced.

The issue you're describing with your Mitsubishi Pajero IO 4g93 could be caused by a number of things. When you shift into drive, the engine loses power and the check engine light comes on, it suggests that there may be a problem with the vehicle's transmission or with the engine control system. Additionally, a low mileage reading could indicate a problem with the vehicle's mass air flow sensor, oxygen sensor, or other sensor that is responsible for measuring the engine's performance.
It's possible that the problem is caused by a malfunctioning sensor, such as the Throttle Position Sensor, that is not being picked up by the diagnostic tool. It's also possible that the problem could be caused by a malfunctioning transmission control module, a problem with the transmission's internal components, or a problem with the vehicle's exhaust system.
It's best to have a mechanic diagnose the issue to determine the cause and make any necessary repairs. The mechanic will have to connect the car to the OBD scanner to read the codes that the engine control module is storing and check the transmission's fluid level and condition, and check the vacuum hoses, or any other issues that could be causing the problem.

Hi Kaeley,here's a link to your problem code. P0708 Hyundai Transmission Range Switch Short Circuit Here's another link to view. P0708 OBD II Trouble Code

That is a faulty park/neutral position (PNP)switch, or the switch harness is open or shorted. It can also mean the Park/neutral position switch has a bad connection. these are all a symptom of code PO705 for the Saab. You are either in Neutral or Park when you see this and it sends the message to the (TCM) Transmission control Module. If you are not a mechanic and take it to a mechanic make sure you make them aware that you know this.

Hello
When the service engine soon light a yellow light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.

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

your vehicle is driving good, not slipping etc... because what i can see from what im reading you have an electrical problem with the transmission wiring.. check the plugs that plug in the transmission, and follow them, im sure you will find something skint up somewhere.

go to autozone and get the codes. they will test for free.

Message Center Display
The following messages may be displayed on the message center.
This message center will display CHECK TRANSMISSION if the following codes have been set.


DTC Codes Possible Faults P1746, P1747, P1760 Electronic pressure control solenoid P0743, P1767 Torque converter clutch circuit P0750, P0755, P0760 Shift solenoid circuit P1714, P1715, P1716 ISIG P0731, P0732, P0733, P0734 SFT error P0741, P1742, P1743, P1744 Torque converter clutch error P1783 Over temperature P1700 NEV error P0712, P0713, P0710,
P1710, P1713, P1718 Transmission fluid
temperature error P0705, P0708, P1704 Transmission range sensor error P0500, P0503 Vehicle speed sensor error P0715 Turbine shaft speed error
NOTE: For codes. For additional information, refer to Diagnostic Trouble Code Chart.

what code did the mechanic say it had on it was it a shift solenoid or torque convertor lockup solenoid.