I'm new to this forum. I have leveraged it several times and typically find the answer to most of my problems without the need to post. However, this one has me baffled.

2007 Chevy Tahoe
1GNFC13037R160373
Manf Date: 3/06

I am convinced that this is an electrical problem, but I wanted to do some vetting here to see if anyone has any input before taking it in and having a dealer start guessing on part swaps to nail it down, since it is all intermittent.


Here is what I have:

about 2 months ago I had a "Low Oil Pressure, TURN OFF ENGINE" warning come on. I was on the road, and the oil was a tad low, so I added a little, and the warning went away.

3-4 weeks ago I had engine light come on with "Service Charging System". I drove for about 20 miles, then stopped. When I got back in the truck the error was gone and I haven't seen it since.

Last week, I had almost the exact same "Low Oil Pressure" warning, symptoms, and resolution that is discussed by "JPTL" in the thread below (along with check engine light).

https://chevroletforum.com/forum/tah...g-41924/page3/

I had the engine light codes checked at AutoZone, and this is what came up.
P0521 - Oil pressure sensor range
P0572 - Cruise control/brake switch circuit low
P0719 - Brake Switch Circuit Low Input

Also C0196, C0900, and C0899

I replaced the oil pressure switch and nothing changed. I then did a complete oil change and everything reset and seemed normal. This was last Thursday.

I left the truck sitting for a few days, then went to start it this morning. The truck was stuttering, and the check engine light was flashing along with "Service Stabilitrack" and a Traction Control Error.

Turned off truck, reset engine light by disconnecting the battery for 20 mins. Everything seemed to return to normal.

Tonight I was unable to unlock the doors using the remote, or even using the button on the driver's side door. I tried starting and it wouldn't start (just a click). When I pulled the keys out after trying a few times, it tried to turn over (NOTE: Keys were NOT in ignition). After that I was able to start the truck, unlock the doors, and everything "seemed" normal again. So weird!

Other symptoms over the past few months:
-occasional "pop" in the electrical system while driving. sometimes the lights flicker, sometimes the stereo turns of.
-occasionally unable to lock the doors and arm the alarm

All of this is intermittent, and none of it is real consistent.

I tried to give as much information as possible without being silly about every detail.

 

Have you had the battery checked out? The last time I had weird things happening it was the battery. It even cranked the engine and started normally. When the battery was replaced everything went back to normal.

 

Funny thing is that the battery was just replaced a couple months back. Come to think of it now, that is probably around the time that this all started.

I will bring it into Autzone and have them run a test on it.

Thanks for the input. I will provide feedback if anything changes.

 

Quick update:

Brought truck in to check battery and charging system, and everything checked out ok.

This afternoon I went to start it up and it wouldn't start. I opened and closed doors, locked & unlocked the locks, pulled key in and out, and nothing. However, when I was trying to turn it over, I would see the radio flash on for a moment occasionally. I also saw the engine light faintly flickering.

Again, I'm open to taking it into the shop, but since this is all intermittent, I'm just wondering if it will be a huge ordeal that lasts months trying to find the right component.

Either that, or maybe it's time to say goodbye to this truck and find something new.

 

could just be a bad ground. there's a thread about bad grounds that cause multiple problems.

here's the link
https://chevroletforum.com/forum/tah...roblems-49751/

 

I am investigating the ground issue. It may take me several days, but I will update when I feel I have some resolution.

Thank you

 

I agree, check the ground from the body to engine, also check the battery cables, they need to be solid and clean...
If you are still not getting any power I would check the mega fuse located on the firewall near the battery...

 

damn pro! your truck is ridiculously clean!

 

I do take care of my ride, the trick is to stay on top of it and never let it get filthy, greasy, oily, or caked on ever.... A real good trick is to rinse it off when its raining Getting the road wash off while it is still wet saves a lot of time washing it when the weather gets nice...

Oops sorry for high jacking the thread with my OCD

 

Probably don't get too many opportunities to drive thru 6" of salty slush down there.

I just mist Simple Green on everything under the hood and rinse off in the Spring and Fall. I've found that when you keep it clean, techs tend to be a little more careful when working on it.