Question about 2006 Chevrolet Trailblazer

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Gas Gage reads empty when full and goes from full to empty throughout tank of gas. At the same time the light for the check engine came on. All about the 80000 mile mark. Is this there way of getting you in for the engine checkups and stuff.

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The gas gauge issue is likely a simple one: the feed wire to the sender unit in the tank almost certainly has got damaged and is intermittently short-circuiting to the car bodywork which provides the earth return. It's most likely to have happened where the wire passes through a hole in the bodywork or chassis. As it's an intermittent fault it will be tricky to track down so the best way is to examine the wire at all of the likely points where it may have got damaged and this may involve draining the gas tank and dropping it from under the vehicle. Wiggling the wire at various points along its length may also reproduce the fault, but actually inspecting and accessing the supply wire may be very tricky as it will be bundled with many others in the wiring loom. It will be quicker and easier to simply run a new wire from the source to the sender unit and to fully disconnect and isolate the old wire, but careful checks should still be made as when there is one damaged wire there are often others. This can be a fire hazard, so unless you know what you're doing or if you're too short of time to attend to it quickly then get an auto electrician to investigate.

The check engine light is most likely an unrelated service issue, but there is a chance it could be indicating another wiring fault. You'll need to get the vehicle to a garage equipped with a good diagnostic computer to see what has caused the warning light, but at 80000 miles it may be indicating that the cambelt needs to be replaced or that a similar preventative maintenance job is due.

FixYa is a free online resource providing information only. FixYa does not directly repair or maintain anything, so it's impossible for FixYa to get us to make a visit as per your request. However, some FixYa Experts do offer their independent professional services via FixYa, but like all FixYa Experts they are not employees of FixYa and do not represent the company in any way. There is a hotlink at the bottom of the page to FixYa's Repair Service Directory (or click here) to help you find someone to directly assist you, or you may wish to use alternative directory services to find a local company to work on your vehicle.

Good luck with resolving this, and I hope that you can take a moment to rate my reply.

Posted on Sep 03, 2010

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