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Re: SERVICE LIGHT FLASHING!
When the battery in those is going it will send a low amount of voltage to the sensors triggering many trouble codes.disconnect the negative side for five minutes and reconnect.this should reset the computer ad erase any trouble codes.
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The flashing service engine light blinking indicates a Catalytic converter damaging event is happening , a misfire ! Don't driver it like that ,you don't want to have to buy a catalytic converter ! They can cost as much as 1,000 dollars . Flashing Check Engine Light CarMD
there is a code in the PCM that needs to be checked out. a light the stays on tells you this a flashing light tells you what ever the problem is can cause a running problem possible engine damage and is allowing the emissions to go out of range.
flashing check engine light is a sever engine misfire that will cause a catalytic convertor failure which is about a $1500 repair in your denali. Have someone scan the code for you and let us know the codes stores in the computer are. Could be as simple as a tune up to fix the problem or bad as a fuel pump
this process will take about half an hour to doyou might want to put a battery charger on it on the low setting because if the battery dies in process u have to start over.first thing is try to start car,it might start then stall,when that happens leave the key in the on position and the security light will be flashing and it will keep doin it for 10 minutes,then it will stay on solid,when it does that turn the key off for 2 seconds then turn it to the on position anfd the light will be flashing agian for 10 minutes,then it will be on solid,then turn the key off for 2 seconds and then back on and 10 minutes later when it stops flashing this time u should be able to start it and the light should be off,hope this helps
when key on and engine off, does the security light flash constantly? if so its shutting down the fuel pump, it starts momentarily due to the computer priming the engine with fuel. how to reset, turn key to run position, leave it on touch nothing, takes 10-12 minutes, start watching light around 10 minutes. it will stop flashing... turn key off, then back on and start this will reset the security system. they are sensitive on this platform car it will happen again. good luck!
Is the Security light flashing??? If so, the security system (passlock II) is ******** off the fuel because the car thinks it is being stolen. If the security light is flashing, leave the key in the "on" position for about 10 minutes and it will stop flashing. Then turn the car off and try to start like you normally would.
You need to have the vehicle scanned or pull the code out with a code reader,and address/fix the code.If you do not repair the problem,you can clear the code,but the service engine light will come right back on.To clear the code,you can disconnect the negative terminal on the battery for at least 20 minutes,then reconnect the battery,but the car is going to be hard to get to idle,because sometimes the computer has to relearn how to idle the engine without stalling.Good luck.