Po752 code The vehicle ran low on transmissions fluid. Now the transmission doesn't want to shift to drive and makes a noise.

There are a few potential causes for this issue in a 2002 Chevy Trailblazer, including:

1. Transmission issues: The transmission may be damaged or malfunctioning, causing it to not shift into gear. If this is the case, it will likely require professional repairs or a replacement.
2. Shift solenoid failure: The shift solenoids control the movement of fluid in the transmission, and a failure of one or more of these solenoids can cause shifting problems, including not being able to engage any gears.
3. Electrical issues: The transmission may not be receiving the correct electrical signals from the transmission control module or other components, which can cause shifting problems. This could be due to a problem with the wiring, connections, or other electrical components.
4. Low fluid levels: If the transmission fluid is low, this can cause shifting problems, so it is a good idea to check the fluid levels and add more if necessary.
5. Clutch or pressure plate problems: If the clutch or pressure plate is damaged or worn, this can cause shifting problems, including not being able to engage any gears.

If you have checked the linkages and fuses, and are still experiencing the issue, it is recommended that you have the vehicle inspected by a professional mechanic to diagnose and repair the problem.

• Low transmission fluid levels: If the transmission fluid is low, it can cause shifting problems. Check the fluid level and add more if necessary.
• Faulty transmission control module (TCM): The TCM is responsible for controlling the transmission and if it malfunctions, it can cause shifting problems.
• Clogged transmission filter: A clogged transmission filter can restrict the flow of fluid and cause shifting problems.
  give it a try good luck

Did you check your tranny fluid before you left? was it making any noise?

Both error codes you have are transmission related. P0736 is an error for reverse has wrong gear ratio. P0700 is a general transmission problem code
http://www.obd-codes.com/p0700
http://www.obd-codes.com/p0736
for more information.

check the transmission fluid , it may be low.
have someone sit in the vehicle. start the engine. apply brakes and shift to drive, listen under the vehicle for a gargling noise, if so and the fluid is topped. you may need to service the transmission

if the fluid is to low it will not engage

CHECK TRANSMISSION FLUID LEVEL AND TV SHIFT CABLE ADJUSTMENT BUT COULD BE LOW.IN FLUID LEVEL OKAY. YOU COULD HAVE FAULTY VECHICLE SPEED SENSOR OR FAULTY SHIFT VALVE OR SERVO BUT HAVE CAR CODE SCAN FOR TRANSMISSION FAULT CODES.

check transmission fluid make sure its not low.if fluid looks black and smells burnt.change transmission fluid and filter.if you already change fluid and filter.your transmission manual valve out of adjustment.or you have faulty oil pump and worn over drive with a damage roller clutch.also forward clutch has worn or burned clutch plates damage piston or seals.

Condition: Some customers may comment on a grinding or rattle type noise coming from the transmission. The noise usually occurs with the transmission in first or second gear at low RPMs and can be intermittent.
Cause: This condition may be originated by the natural harmonics of the engine that leads to a vibration in the transmission.
Correction: There are two separate noises. Follow the diagnostic procedures listed below to determine which noise the vehicle has and perform the outlined repair. If you are comparing like vehicles, you must compare vehicles with the same motor and similar mileage.

Diagnosis for Noise #1
This is a very distinct noise that is usually much louder than the second noise that can be associated with this transmission. If the vehicle is not making any noise when trying to verify the condition, it can be induced by making several tight left hand circles with the vehicle at normal operating temperature.
Making a sharp right hand turn will usually stop the noise. While the noise is occurring, in order to
distinguish between the two noises, you can press lightly on the clutch pedal without releasing the clutch and the noise will NOT go away or change. As a second diagnostic aid, while the vehicle is making the noise, shift to third gear and the noise will stop. If the noise is determined to be this type, perform the repair for noise #1.

Repair for Noise #1.. Replace the transmission fluid with Saturn Manual Transmission Lubricant, P/N 21018899. Overfill to a capacity of 2.4L (2.6 qts). A possible side effect of this repair may be a higher shift effort.
Solution #2 Capacity of 2.4L (2.6 qts). A possible side effect of this repair may be a higher shift effort.
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information
sub-section of the appropriate Service Manual.
2. Place a suitable container under the transmission assembly.
3. Remove the drain plug located on the bottom of the transmission and completely drain the fluid.
4. Re-install the drain plug. Tighten the drain plug to 38N·m (28 lb ft).
5. Lower the vehicle.
6. Remove the fill plug located on the top/middle of transmission on the driver side, near the red
vent cap. If you use the check level plug on the side of the transmission, you will not be able to
overfill the transmission.
Important: Fill the transmission to the amount specified. Too much lubricant will cause the fluid
to leak from the vent. Not enough fluid will defeat the purpose of this bulletin.
7. Fill the transmission with 2.4L (2.6 qts) of Saturn Manual Transmission Lubricant P/N 21018899.
DO NOT USE THE RED VENT CAP TO FILL.
8. Re-install the fill plug. Tighten the fill plug to 38 N·m(28 lb ft).
Diagnosis for Noise #2
This noise, commonly referred to as gear rattle, can be induced by lugging the engine in any gear, but is
usually most noticeable in first or second gear. While the noise is occurring, if you press lightly on the clutch pedal without releasing the clutch, the noise will be reduced or eliminated.
Repair for Noise #2
Do not attempt to repair this noise. This is a characteristic of the vehicle and any vehicle equipped with a manual transmission can be made to make a similar noise. Driving at slightly higher engine RPM levels will reduce this noise.

Though you did not say, I'm going to assume it's a stick shift.
Shifter popping out of gear nearly always indicated an internal transmission problem (likely worn synchros) Either way, trans needs to be replaced or rebuilt. Transfer case is supposed to be filled with good grade auto transmission fluid, though some people opt for gear oil (but it gets really thick in cold weather). You may aslo have a t-case problem if you ran it low, but it is not related to shifter problem!