Hi Folks, Recent problem with troublie free 2002 Tahoe with 68k miles. When I turn the ignition key, the starter cranks, but will not turn over the engine. All dash indicator lights are on, just no engine running. This will happen 2-3 times (dash indicators on, starter cranks, no engine start). Then on the 3-4 try, the engine will catch and start up. The problem is getting worse (more frequent). Also, on a couple of times this has happened, the dash board indicator lights will go completely out, after the starter cranks (without the engine starting). But here is a clue. On some of the the times where the dash indicators go completely dark (after starter cranks with no engine start), the dash board clock resets to 1:00. Now, the only time I've seen a dash board clock reset is when you take out the battery. I replaced the battery, and everything else seems normal. All electical systems work with the engine running, or when using the battery. Please provide any diection you can.
Thanks very much! Kind Regards, Jim from Maryland.
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Re: 2002 Tahoe engine will not start
Electrical problems are difficult to diagnose in person without testing ...however, it seems that you may be loosing the body ground, causing power loss to the clock and likely the computer as well. As the starter is able to turn the engine, likely there is no problem with engine grounding. While cranking, the accessory side of the ignition switch should remain "hot" otherwise you would loose the clock every time you started it up. If it's not a ground problem, I'd look at the ignition switch itself to make sure it's not dropping power to ignition system while starter is engaged. on some vehicles this can also happen at the starter relay if an ignition bypass is used to provide hotter starting spark.
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I have towed several of these with same problem. Sounds like to me it needs to go back in for the ignition switch again. Unless it's not going into park. If it's not going into park it would be a shift linkage issue and needs to be adjusted. Chris J.C. Towing & Recovery
If you had battery unhooked and assuming that it is turning over try this
Put your key in turn it on dont start wait 10 mins remove key wait 10 seconds repeat this a total of 3 times. If that dont work try a different key do the same thing. This relearns your key to the ignition it started with Gm cars and trucks from 1999 to to 2006. It is a big problem but there is no recall that I know of. If that dont work a dealer needs to probably replace and reprogram your ignition switch and keys
check and recheck all conections on battery and starter and grounds on battery and the ground on engine bblock and body ground or grounds,if not sure make another one ,check connections at battery ,it does sound like a bad ground to body and eng just make ur owne and see what happens
If he had it started two times without the key , i would think it was the starter either . Do you an the guy who replace the ignition switch know how the starting system on your tahoe works ? Do you know what a neutral safety switch is ? Try moving the gear shifter to neutral an see if it starts then . That is if your tahoe has a automatic transmission . When you turn the key to the start position this sends a voltage signal to the PCM - engine computer which inturn will energize the starter relay , closing the contacts sending B+ voltage to the starter solenoid , spinning the engine over . Using a factory scan tool you would be able to see if that start signal from the ignition switch is making it to the PCM . Also would be able to energize the starter relay with the scan tool to see if the computer can energize the starter relay . You could also do testing with a DVOM - digital volt ohm meter . Find the PCM an connector 2 pin #59 , this is the circuit for start from ignition switch . Have someone turn the key to start , is there B+ voltage ? Find the starter relay in the under hood fuse box, pull it out an look on the bottom . You will see four sets of numbers 30 , 87 , 86 , 85 . If you take a piece of wire an jump 30 an 87 in the fuse box the starter will crank the engine , or spin the engine . If you do that and it won't start , cables , connections or the starter is the problem .