Code p1682 need to know if the alt is bad

P0325 P1682
https://www.fixdapp.com/blog/p0325
https://www.engine-codes.com/p1682.html

I did some testing, fuel pump was bad but not the problem. Turns out I had a bad power train relay. I jumped it and it fired right up and ran at idle smother than it has in a long time

Hi the code I see for this seems to be for I beleave.

A/T FI Signal A High Input.

dont know if this was any help to you.

P1682 Chevrolet - Ignition 1 Switch Circuit 2

Possible causes
- Faulty ignition switch
- Ignition Switch harness is open or shorted
- Ignition Switch circuit poor electrical connection
- Faulty Engine Control Module (ECM)
What does this mean? What does this mean?
When is the code detected?
The ECM has detected a voltage deifference between two circuits
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible no crank or start
P1682 Chevrolet Description

There are 2 ignition 1 voltage circuits supplied to the Engine Control Module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set

Read more: http://engine-codes.com/p1682_chevrolet.html#ixzz3dr4CYBUT

voltage regulator in PCM

Here's code P0443.Here's code P1682.Here's code U2100.

parts store can tell what the code is or dealer..

Code p1682-A/T FI signal A high output.
It's a C code fault.
I recommend you clear it.

P1682 - Charging system voltage to low.

P0523 means the Oil pressure voltage to high. Your Oil pressure sensor may need to be replaced. P1682 means your charging system is to low. Your voltage regulator may be going bad or the whole alternator. p1693 means a Diagnostic trouble code (DTC) has been detected in the ECM or PCM which is related to the above DTC P0XXX codes. Good luck and hope this helps. Keep me posted, be glad to help