Stereo code for 2002 grand cherokee please as battery had ran out

Fuel too lean in bank 1.
Maybe it has an airleak or a faulty signal from and Lambda O2 sensor.

Can't even guess at your problem

Need your vehicle to start testing

I think you know that

Do you hear the fuel pump & have
pressure at the fuel rail?

According with your other quesions, the DTC P1491 code is actually radiator fan control relay circuit.
Soft reset if the battery disconnect would have erased the code; the first thing I would replace for that code (fan relay).
Additionally, its possible thta your THEFT system is activated, check owners manual to disarm. Check details here:
- Grand Cherokee fuses

- Diagnostic Trouble Codes

Hope this helps.

WJ Version of Grand Cherokee (1999-2004): Jeep Grand Cherokee WJ Owner's Manual.pdf

Hope helps.

The voltage regulator is in the PCM. If there is a problem with it, the PCM has to be replaced.

code should be in the owners manual but I'm assuming you don't have that

therefore, you'll have to see the dealer or a good technician that has a professional scanner so that they can retrieve the code electronically

you really need to get to a dealership and check for trouble codes and go from there

Try going to the starter and check for battery power on the larger wire from the battery if that has power have some one sit in the truck and hold the key in the start position and check for battery power on the smaller wire if this has power the starter is junk try and tap it with a hammer some thimes they will start

these factory radios do not have codes ,is it aftermarket?

try unhooking the battery to see if resetting the body computer helps. low batteries and poor connections at the battery can cause weird problems like this