Check engine light and p1599 code 2003 Saturn Vue

P1406 SATURN 5,974 Views EGR Valve Pintle Position Circuit

Read more: https://www.autocodes.com/make/saturn/13
P1599 SATURN 21,379 Views Engine Stall Or Near Stall Detected

Read more: https://www.autocodes.com/make/saturn/13
both codes point to needing a new EGR valve

P1599 - means that the computer detected that the engine stalled when the ignition had not been turned off.
Does your vehicle have a stalling problem?

P2138 - is the Accelerator Pedal Position Sensor 1-2 correlation.
The accelerator pedal has a sensor and the throttle actuator has the one as well. the computer expect thats both sensor will read the same as the accelerator pedal is operated. If one sensor read differently from the other the computer will set this code.

Long story short, you'll have to have shop to check this code out for you since a scan tool will be needed in the diagnosis of this code.

I have the same problem with my 03 Vue. I found some people saying that you can install a bcm on your own and by turning the ignition on and off in a certain sequence it will program itself. However I personally am going to take my car to a dealer. You can try to find a shop that has a tech 2 scanner (gm specific scanner), but it's not easy to find.

you have a bad computer my friend. nothing you can do but order up a new or remanufactured computer. try all your local parts stores. when you get the computer you will have to have a shop reflash it for you.

Before you replace the sensor, you should check the voltage circuit for the heater. The sensor may be fine and not getting voltage to the heater inside.
The code 1599 just means the engine has stalled at some point. It does not tell you why or how.
I doubt the two codes are related.

for the engine light to come on there will be codes stored
It is that the mechanic is not using the correct scanner with the right protocol installed to read them

The CEL (Check Engine Light) will not go out until you hook up a OBD II scanner to your vehicle and erase the code. If it comes back again after you erase it than either the original problem still exists or you have a new problem. You can go to your local AutoZone store and they can hook up a scanner and erase your code for free.

P1599 IS A STALLING ISSUE COULD BE BAD GAS / BAD FUELPUMP DIRTY FUEL FILTER
DISCONNECT BATTERY AND SEE IF THE LIGHT COMES ON AGAIN
U2107 HAS SOMETHING TO DO WITH THE COMPUTER LOOSING POWER AT THE BODY MOUNTS CHECK CABLES AND GROUND STRAP

It is most likely the Throttle Position Sensor has gone bad. But if the check engine light is on, the only way to tell exact problem, is to have a scanner placed on the vehicle to have the codes read.

Here is the definition of the code in GM manual:
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature, this indicates the engine is running cold, u need a thermostat