Whats wrong with my truck.?

Question

I have a 2001 chevy tahoe, I just replaced the battery. Now the anti-theft system goes off every time I open the doors, sometimes it won't allow my truck to start, and I have to disconnect and reconnect the battery, and in doing that the truck starts on its own, without a key. What the hell is going on?

Answer 1

My owners manual says after changing battery, it's not recognizing pass coded key that came with the truck...
Insert key, turn to on position, wait 10 seconds, (code will reset) then start truck...if that fails, take it to the dealership.

Answer 2

Assuming you didn't reverse the polarity of the cables and terminals (in which case, half your electronics would probably be fried!), you might have a short between the battery cables or terminals and any grounding metal, such as the hood.

Make sure the battery itself is seated as far down as possible. Just because it's "tight" doesn't mean that it isn't on the battery "shelf" correctly! It astonishes me that virtually no car user manual that I've seen mentions this when describing how to change a battery!

Make sure there is no white residue (corrosion) in, on, or around the terminal or cable. Any reduction in voltage may make your vehicle's computer think that someone is trying to hijack it, as would be the case when ignition wires are cut and bypassed in attempted thefts.

Make sure the cables are on the correct terminals (always remove the negative (usually black) cable first!), and that they are seated as far down on the terminal as possible (some people tighten them without holding them down, which may cause them to slip up the terminal without even noticing it!), and that there is no metal contact between the terminals, cables, and vehicle itself. Try lowering your hood as slowly as you can, and see if the terminals or cables are making contact with it (you may need to use a flashlight and goggles, since you'll probably need to be very close to it, and you don't want potential sparks in your eyes!). If so, then the cables and/or battery are not seated properly.

It is also possible that in moving the cables, you may have accidentally pulled them from their connection or housing or ground on the other end. This is not always easy to find nor is it always something you can do anything about.

As for the vehicle starting on its own without the key, that is a major safety issue, which *might* be explained by the above, especially if a short is involved. Regardless, whether you are technically proficient or not, I'd strongly recommend going to the dealer or a trusted mechanic to get it fixed.

Answer 3

I'd have to agree with oklatom. I own a GM caddy and the battery on these cars has a whhhhhhollllllle lot of responsibility. Once one goes bad or discharges, the entire car shuts down completely (key doesn't work, alarm system puts the car on lockdown, etc). Not to say that's bad but total security comes at a price. Take it to the dealer. The fix for your problem should be very quick and inexpensive.

Answer 4

You apparently had the battery disconnected for long enough that the anti-theft system lost it's settings. Drive it to the dealer to have it reset.

Answer 5

I am fighting back the laughter sorry .
I think there is a procedure you must follow.look in the manual to see if you must disconnect the alarms before changing the battery .
Hope this helps and solves your problem .
Other wise shoot it because it's possessed ROF.

Answer 6

if your truck is equipped with an aftermarket remote start then it has a passkey bypass installed and you may need to unhook it first reconnect the bat and go from there

Answer 7

It is possessed.
The dealership should have an excorcist on his staff, talk to the service manager.
Plan on bringing a large contrubution.

Answer 8

It sounds like your battery is broken. Take the battery back to the store and ask for a refund. Good luck.

Answer 9

take it back to whom ever installed the alarm, it needs reset