It could be the starter has a dead spot,the battery voltage is weak,the ignition switch itself,the antitheft passkey or the neutral safety switch..it could also be a bad brake switch.The shift /start interlock is connected to the brake switch...
troubleshooting..... 1) put a test light on the small wire on the starter and see if it lights when attempting to start.if it has 12v or the test light is bright,,but will not crank,tap the starter gently with a plastic hammer,if it cranks the starter is bad.2) make sure the security light is going out.If not it is not reading the passkey and the ignition is faulty.3)when it does not start,jumper with a good battery and see if it starts if it does the battery voltage is low.4) make sure the brake lights go on with every application of the brake pedal.5)try to start in neutral instead of park when the failure occurs,if it does...the neutral safety switch is no good.
best of luck
SOURCE: 2006 yukon wont start. Replaced battery and
check the lead wire to s terminal on the starter, it should have voltage with the key on start
SOURCE: 2005 GMC Sierra 2500HD 6.0 Won't turn over
I have seen many ign switchs. Check to see if the theft doesn't flash when you try to start. It is still posable that the starter is going. Have someone crank the engine. Check for power on the purple wire. If there is power and the it does not crank. Check that the big wire has a soild 12 volts. You can use a screw driver and jump the purple and the big 12v battery at the starter and it should turn on if not replace the starter
SOURCE: My 2002 GMC Envoy wont start. I have had it on
try car to car boost-battery charger may not be working correctly or set on low amp charge -interior lights and dash may all light but battery may not be strong enough to energize starter have battery tested if battery good than check for power to the starter if power-- starter may be shot can remove also and have tested at most auto stores free if no power battery -wiring-or connection issue would need to test fuse panel-ignition switch and starter solenoid
SOURCE: have a 2003 yukon turn the key and sometimes it
Yes it could. The start solenoid has a large washer that has to make contact to flow the current the starter needs. Over time it gets covered with carbon and burn marks. These will eventually get so bad that they dont conduct the current necessary to make the starter crank. Technically you can just replace the solenoid but most shops wont and will insist that it is better to replace the whole starter. In many cases the labor will be the same and slightly more perhaps to repair the solenoid then to just replace the starter.
As you can see though either will fix the problem.
SOURCE: My 2004 Yukon will not engage starter, battery is
sounds like the startor motor or ignition switch check startor motor first good luck
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