With the electronic's on your vehicle ,really ,it could anything. At that point I wouldn't even trust the gauges. I have a 05 Trailblazer and had both of these problems. No oil will caused the engine to destroy itself. I was told that the repair would be 400.
I was told by the dealership that my entire dash cluster needs to be replaced in order to have working oil gauge. The car wouldn't take gas but the gauge displayed not quite full. These conditions can happen at any time, driving, parked or idling but the key must be on to power the accessories. At the base of the brake pedal you will see the brake light switch. Having a scanner hooked up by a professional technician that knows what scan data to look at should be done. Perform steps 5 through 8 in a fairly rapid succession.
He let me go with a warning to get it fixed. Answered on May 23, 2018 Could be ignition switch problem or a stuck closed relay. I have noticed the battery gauge fluctuated while this is happened. The contact was unable to see current vehicle speed. I also bought that vehicle new and needless to say was not helped by Chevrolet with the repair of that dash?? It can't be fixed by a non-gm service center because gm has to reprogram the electrical system once it is fixed so it would then have to be towed to a gm dealer anyway and would cost even more. A replacement dimmer or bypassing the current one and adding a resistor should take care of it. Check with some place like Autozone, they will check it for free.
When the headlights dim, the dash gauge needle flicks around like there is an intermittent drop in charge voltage from 14+ to 13. The vehicle was not taken to have the failure diagnosed or repaired. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode. This is serious because it means there may be little to no oil in the engine. The vehicle was taken to the dealer where it was found that the instrument cluster had failed and needed to be replaced.
There is no vacuum used for cruise control on your vehicle. The vehicle was not taken to a dealer or independent mechanic. This is a big problem. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. The doors lock automatically and sometimes won't unlock if they were locked when the car was turned off until the car is turned on again. The problem is in removing the grill, how the heck do you do that? This vehicle is a total junk full of defective equipment, one of them being the instrument cluster. We don't have the money to get it fixed but we travel so much for such long distances that it is extremely dangerous.
You can live with the gas gauge not reading correctly by tracking your mileage but the stupid bell goes off all the time telling you your near empty but you cannot drive safely if you do not know how fast you are going and you certainly cannot go with the flow as everyone seems to drive faster than allowed and I do not think the officer who pulls you over will care if your speedometer does not work. It seems to be getting worse. The hardest part to the whole thing is making the wiring connection in the back of the switch for the two large ones on the center crossbar. I can understand why gm needed a government bailout by manufacturing vehicles having such a grievous problem. The approximate failure mileage was 110,000. Once you get the clip off you can undo the electrical connector and the switch should slide off.
The speedometer will read 0 no matter how fast I'm going which is apparently a known problem with Chevy vehicles, but they are not willing to fix it in the Trailblazer. I have read where others had the problem and it was thought to be some kind of defective connector or similar on part of the wiring harness that plugs into the alternator. Very expensive labor needed to fix this. Do yourself a favor and stay away from this junk. Right after purchase I noticed something was off with the fuel gauge. Thanks, Dave Sounds like your alternator has some bad diodes.
The gas gauge quit registering Sept 2012, I called my Cheverolet dealership as I had done some research online and found out that for my year and model there was a recall because of the gas gauge issue. The contact also mentioned that the fuel and temperature gauges failed to operate. I found using a pair of hemostats or some type of thin clamp with a handle works very well. I need a solution, that won't cost me and arm and a leg. I took it to dealer.