SOURCE: 2006 GMC Sierra electrical problem
If your Sierra has a Duramax, it may be the intake air heater or the fuel heater cycling on and off in the cold weather. But if its pulling the voltage down to 12V after warmup, I would suspect a poor battery. As suggested, get a load test at autozone or ??
SOURCE: 1998 GMC Sierra radio and display stays on all the time
First of all...does your truck have the retained accessory power (RAP)? If it does, the radio would always stay on with the key off until you open the drivers door. If it does have RAP and the door pin on the drivers door has went bad, then the truck doesn't know that you opened the door and continues to allow accessory power (although it would still cut off after about 20 minutes). If the interior lights come on when you open the door, then the pin is ok. If the lights come on, it could be the RAP relay. If it has gone bad, it is possible it is stuck supplying power and needs replacing. The relay should be labeled in the fuse panel, and there should be other relays in the panel with the same part number. You can swap a relay for the RAP relay and see if it fixes the problem...if it does fix it swap the relays back and replace the RAP relay. If the truck doesn't have RAP then it is possible the problem is in the radio..if you have a friend with a GM car or truck close to the same year you could swap radios and see if that fixes your problem...should be pretty simple. pull the cover off the dash, it just clips on, take out a couple screws that hold in the radio, unplug it and plug in the other radio. sorry so long winded...hope this helps you somewhat.
SOURCE: 2001 GMC SIERRA . ABS LIGHT STAYS ON
Wheel speed sensors misadjusted, damaged , or metal shavings and other debree, since they are magnetic can give false readings from one of the wheel circuits. Over sized tires can give of false speed readings as well. there are many other causes including bad relay, control module, e.t.c. It is best to have the proper scan tool to diagnose an ABS problem
SOURCE: 1995 GMC Sierra Z71 ABS light stays on
yo man, idk if this is exactly what your problem is but my 1991 gmc sierra was doing the same fuckin thing and ****, and i took it to the gm dealer and had them look at it and my connectors and my ignition switchs were fried, also my truck was having a problem shitfing once those went but i also had that problem, perhaps yours is somehwta liek that as well... hope i could help
SOURCE: 2006 GMC Sierra Denali,wont turn over, battery
iF YOU HAVE NO 'CLICKING' OR ANYTHING THAT INDICATES A DEAD BATTERY - NO DASH LIGHTS ETC, THEN LOOK AT YOUR BATTERY FIRST, TRY TO JUMP IT. THISE ARE TOUGH TO JUMO AND TAKE ALOT OF JUICE TO START YOUR VOLT METER NEEDS TO READ OVER 13 VOLTS, DO NOT CONNECT TO BATTERY FOR BEST RESULTS, CONNET TO ENGINE, NEXT TO THE ALTERNATOR IS A GREAT SPOT, AND THE RED BLOCK THAT IS UNDER THE MASTER BRAKE CYCLINDER (YOU'LL SEE IT WHEN YOUR STANDING AT THE FRONT OF THE TRUCK AND LOOK TO THE RIGHT BETWEEN THE BATTERY AND THE ENGINE)
IF YOU CAN GET ANY JUICE TO THE CAR TO EVEN MAKE THE LIGHTS COME ON AND GET THE INSTUMENTS TO READ OUT, ETC BY USING JUMPER CABLES, THEN MAKE SURE YOU CAN GET JUICE, ALSO MAKE SURE THAT EVERYTHING IS OFF, ROLL DOWN THE DRIVERS WINDOW - OF COURSE YOULL NEED TO MAKE SURE THAT IF THE VEHICLE DOESNT START TO LEAVE THE JUMPER CABLES ON LONG ENOUGHT TO PUT IT BACK UP, AND CLOSE THE DOOR, LEAVING ANY ACCESORIES ON LIKE THE AC, RADIO, ETC JUST MAKES JUMPING THIS 10x HARDER, YOU MIGHT EVEN NEED 2 CARS AND 2 JUMPER CABLE, I THINK THE BEAST NEEDS SOMETHING LIKE 400 AMP TO CRANK OVER, IT'S ON THE BATTERY. ANYWAYS THE REASON WHY YOUR PUTTING THE WINDOW DOWN IS SO YOU DONT LEAVE THE DOOR OPEN AND WASTE JUICE, LEAVE THE KEY IN, BUT JUST PUL IT OUT ENOUGH SO IT'S NOT CHIMING. HAVE THE PERSON WHO IS JUMPING YOU SLOWLY REV THERE ENGINE TO SEND MORE JUCIE TO YOU. I HAVE THE SAME TRUCK AND HAD THIS HAPPENA MILLION TIMES. I FINALLY BOUGHT A JUMPER BOX FOR $50 AND IT SAVED ME ALOT OF HEADACHES. MY PROBLEM WAS I HAD A PROBLEM IN THE ELECTRICAL THAT LEFT A DRAW OPEN - THE IDEA THAT WAS POSTED ABOUT BYPASSING RIGHT TO THE STARTER IS A GREAT ONE, BU IF YOU NOT SURE WHAT YOUR DOING IT'S NOT REALLY THE 1ST AVE I WOULD TAKE, IT WILL JUMP THE TRUCK AND TURN IT OVER (UNLESS THERE IS ANOTHER PROBLEM) BUT WHAT ABOUT THE NEXT TIME? IF YOU PUT THE KEY IN AND GET A READING OF 13 +/- VOLTS ON THE DASH GAUGE THEN YOUR PROBLEM IS MOST LIKELY YOUR SOLINOID (SP) IT'S ABOUT A $60 PART AND EASY TO PUT IN, INVEST THE $$ TO BUY A CHILTONS OF EVEN BETTER A GM SERVICE MANUAL FOR THE TRUCK. WHEN YOU DO GET IT STARTED THE GAUGE SHOULD START TO RISE AND READ 14.5 +/- VOLT CONSISTANTLY, BUT IF YOU GO TO AUTO ZONE THEY WILL 'LOAD TEST' YOUR TRUCK FOR FREE. IF YOU STILL HAVE THE ORIGINAL BATTERY ITS TIME FOR A NEW ONE - AND DONT CHEAP OUT ON THE CHEAPEST ONE, SPEND THE MONEY FOR A GOOD BRAND OF BATTERY, SOMETHING THAT CAN HANDLE THE BEAST, 600 COLD CRANKING AMOS IS WHAT I THINK THE RATING FROM GM IS. IT WILL SAVE YOU A LOT IN THE LONG RUN. AUTO ZONE WILL HOOK UP A TESTER AND LET YOU KNOW IF YOUR BATTERY IS NO GOOD OR YOUR ALT IS BAD, ETC. BUT IT PRETTY MUCH ALLL STARTS WITH THE BATTERY.
THE ONLY OTHER THING IS THAT YOUR VEHICLE MAY BE IN LOCK DOWN IF YOU HAVE A KEY THAT IS WORN REALLY BAD AND ALOT OF MILES YOU MAY NEED TO REPLACE THE IGNITION CYCLINDER - ANOTHER $60.00 FROM THE PARTS COUNTER, AND THEN YOU NEED TO HAVE A BLACKSMITH CODE THE CYCLINDER, $35.00. HOPE I'VE HELPED
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