Codes P0690 and P16B3

[94cruiser]

66K miles

I have these two codes.

Had them a month ago, 1 k miles ago as well.

Had AC Delco plugs replaced at the dealer at I believe 55K (would need to dig up the paperwork).

Ideas what can be the issue?

 

[MelsRegal]

How old is your battery?

 

[94cruiser]

Replaced with AC Delco not long ago.
Guess about 2 yrs ago, need to look through paperwork to be exact.

Last time had the error, tested battery at an auto parts store. They told me it’s solid.

 

[RD_Atlanta]

Perhaps you should monitor the charge voltage to determine if it's a bit on the high side since both of these codes indicate that the PCM is sensing higher than expected voltage. If there is a cigarette lighter style power receptacle available in your TorX, you could plug-in one of these (link below) volt meters to occasionally glance at while your driving.

https://www.amazon.com/Charger-Adapter-Cigarette-Delivery-Compatible/dp/B08N4WKJMT/ref=sr_1_4?dib=eyJ2IjoiMSJ9.dy39XtJgkYuQFVivpDceXFhhQIs96s-kVvcx6GI3Qqm1yLdpxt-UpitYIJTl5cP3j2Ea8lsPmnCzIQ2ys3Y2m3-659ziPAoBJ8AeukO7ZoqGuNdWNRri46N80DD_qim6vgFhMvFbLj4zomS5LYY9DY381eZacqJWoQVW-tetCpUdYcEOcCnABGupUGJpJQRYQhMkJKGew0Fmux-FRAMZ41TUGa5tb7stdnSTA-6rfA0.L3U7rQ2lHkFHyxGKhcFFivyzO3N-Xo5b4aB21nTuvEM&dib_tag=se&keywords=12v%2Bsocket%2Bvoltmeter&qid=1752905380&sr=8-4&th=1

If the charge voltage is normal, then one might suspect the PCM monitoring (A to D circuit) has an issue. If the voltage is indeed high, then the voltage regulation should be investigated. But first, I think it might be prudent to monitor the charge voltage level. I don't know what the specific max threshold that is programmed into your TorX but I would suspect that 15 volts (or greater) would likely flag these two codes.

 

[RD_Atlanta]

An additional thought to consider, your TorX on board status display in your TorX may have the ability to display the PCMs interpretation of battery voltage (my 00-05 LeSabre's supports this, so your TorX 'may as well). This way you could compare what the PCM thinks the voltage is compared to the external volt meter (mentioned in my previous post). If the on-board status does not support displaying the battery voltage then you would need to use a scan tool to make this comparison.

 

[MelsRegal]

Replaced with AC Delco not long ago.
Guess about 2 yrs ago, need to look through paperwork to be exact.

Last time had the error, tested battery at an auto parts store. They told me it’s solid.

So how did you get rid of the error last time?
Also two years depending on how often driven, battery equality and luck doesn't rule out another battery or charging system problem.

 

[94cruiser]

This is my only car and I drive it daily. About 10 k a year.

I read and cleared the codes using a scan tool.