Chevrolet - Tahoe :: 2003 - Die Almost Every Stop / Can't Drive When Tank Reaches 1/4


Nov 19, 2014

So far, I have a small fortune into fixing this / related problems. I'll state what we've done and what is currently happening. I've taken it to my normal mechanic several times, I'm looking for additional opinions because they basically have no idea. This is on our 2003 Chevy Tahoe, my wife's daily driver, and what my kids are normally riding in. It only has about 60K actual miles on it and is a flex fuel model, if that matters.

Originally, the truck would have trouble starting. Cranking, but no ignition. Waiting a a few seconds, try to crank again and it would start up. This went on for about a week and then it stopped cranking cranking at all. Had it towed to our mechanic. PCM B fuse was blown. Replaced PCM B Fuse (20A) and it blew again after starting. It died while trying to idle. They did some voltage drop tests, seemed good. I'm not sure they did any current tests at the fuel pump which is on that fuse. Ended up there for 4 days (yes, lots of labor) and leaving with no real clue, but a 25A fuse would work.

A week later,we were still having problems (but my memory is a bit shady). The mechanic did some pressure tests and bleed tests and said that our fuel pump was outside the specified pressure and needed to be replaced. Dropped tank, replaced pump and sending unit with a new AC Delco, replaced fuel filter. Took it home, it seemed great.

Then my wife called me and said her truck was dying at every stop sign. When she got home, I verified, the tank read 1/4 full, truck would die at almost every stop. Truck would die slowing from 45 to 20 mph to make a left turn. This was dangerous, took it back to mechanic. Mechanic couldn't find an issue, but figured it was the sending unit. Replaced the part under warranty, didn't charge me any labor. They thought that we were really empty at 1/4 tank and had a bad sending unit, but that doesn't seem to be the case now.

Here are the basics of where we are: Truck runs fine when above 1/4 tank of gas.The truck suddenly dies when stopping or slowing down when the gas gauge reaches 1/4 tank. Starts right back up with no struggle, otherwise runs fine when the tank is low..Tank never empties. We can get a maximum of 16-17 gallons in it. The tank is 26 gal, and we previously have filled it with as much as 24+ gallons in one filling. The gauge needle barely touches F when full, and basically, the car is undrivable when it reaches 1/4.

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Chevrolet - Tahoe :: 2007 - Switching From 2 To 4 Wheel Drive Itself?

Chevrolet Tahoe 2007

This service light came on 2 weeks ago. The next day, the car seemed to be trying to switch from 2 wheel to 4 wheel drive. Took it to the dealer who found nothing. We drove the car for 2 days without any service lights coming on. Then the switching ( 2 to 4 WD) started again, but this time the transmission would not go above 1st gear. Pulled over and turned off the engine, then tried to restart it. Nothing. Dead. A few minutes later, we go it back home. Had CAA tow it back to the dealer. It's been a week and they found nothing. They are looking for engine codes that would explain the problem.

Is this an electrical problem or a sensor issue?

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From time to time, my Tahoe gives me the "Reduced Engine Power" error, and I lose acceleration capabilities and have to pull over. After a min or 2, I can go again, but the check engine light stays on. With no rhyme or reason, the light will be on or off on the next start up. The problem may or may not happen during a short ride or may happen quite often. I have replaced the Accelerator Pedal sensor, so that is not the problem, I'm assuming.

I've been told that it is the Throttle Body that needs to be replaced, but no mechanic can confirm. They just want to replace it and the pedal. I would really like to keep this truck for a couple more years. Other than this problem, the Tahoe has been pretty good to me. Here are the codes that have been read: P1125, 1516, 2120, 2125 ....

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There seems to be no rhyme or reason, one day it did it 4 times w/n the first 20 miles, then ran 100 miles w/o doing it at all. I recently took it on a trip that normally takes me 1 1/2 hours, it took 2 1/4 hrs that day because I had to pull over so many times. I was having to stop every 3-4 miles by the time I got there. My usual mechanic has completely given up, told me to trade it. I have had it to another mechanic for over a month now, 3 times he has thought it was fixed, but it wasn't. One time, I didn't even make it the 5 miles to my house before it acted up again.

One other note on this: this past trip I made, I left early in the morning and my lights were flickering high/low. . . this went on for several miles. Finally my lights quit flickering, then I lost engine power, pulled over, shut it off. When I started it back up, the lights started flickering again. The cycle seemed to continue, once the lights would settle, the engine would lose power. I took it to a parts store and had the battery and alternator checked. They said both were fine. (Had never noticed the light thing before, but I can't think of a recent trip after dark.) How I can pass along to my mechanic?

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