You have a blown tranny nuetral sensor
Its wired
But also at same time you have a faulty ground or power lead to reverse lights
Buy a circuit ground light tester there cheap
They come with alligator clip
Put on known ground then touch tip to hot wire light comes on ground good
You can check hot leads by finding a power lead and touch ground light will come on if wiring good
Theres also the reverse sensor below the shifter knob
If you did radio install you crossed wires undo the radio trace wires
Fuses only blow on a ground out
Make sure you have proper bulbs set for your car specific for colbolt
There might be look alikes but power to them can blow them if wrong
SOURCE: 2001 S-10, Blowing "ECM Batt" fuse after running for about 30 min
that fuse feeds power to fuel pump relay circuit that feeds pump could be defective pump,or damaged circuit wires that shorts out! and not a good idea to put higher fuse in circuit could cause more damage to circuit! but i know when your stuck, u do what it takes,so inspect circuit related to fuse,
SOURCE: reverse light not working
There is a sensor that connects to the light shifter which tells the car when it is in reverse. It may need to be replaced. You can remove it and check it with an ohmmeter or voltmeter to see if it is good or not.
SOURCE: 2004 Chevrolet Aveo Brake lights not working
A couple of days ago my brake lights on my 2004 Chevy Aveo wouldn't work, so I attempted to remove the lamp covers to check the bulbs. Also, before this my shifter would get stuck in park and could only be released by pressing the unlock gadget next to the shifter. Back to the brakes...Well, you open the trunk and remove the two screws just like the manual said, but it was very hard to pull off. There's 2 prongs holding the other half of the light on. The lamp will come loose by prying it (very hard). You think the cover will break, but it'll come loose. The bulbs were all OK.
After much frustration and internet info, the STOP LAMP SWITCH, GM#96436331 ($9.30 at Chevy dealer), which is located under the dash and has contact with the brake pedal, was defective. Once replaced, both my brake lights AND SHIFTING problems were cured. So if the brake lights suddenly don't work or you have problems getting the vehicle out of park, check the switch by pushing the prong (end that has contact with brake) of the switch in and out. If it doesn't retract smoothly...that's the PROBLEM. Good Luck.
SOURCE: 2006 Chevy Cobalt Tranny issues (automatic) no 4th gear!
I had the same problem but eventually lost reverse. Had to get a new transmission... $2,300.00
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