At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
2003 gmc sierra will not start it has 12 volts all the way to the starter.I checked the fuses . Im not sure if its a relay or how to check those . Help thanks , leo
Re: 2003 gmc sierra will not start it has 12 volts all...
WHEN YOU TRY TO CRANK IT ,TURN HEAD LIGHTS ON .HAVE SOME ONE WATCH THE HEAD LIGHT TURN KEY AND SEE IF HEAD LIGHTS DIM IF THEY DO MOST LIKELY STARTER IF THEY DONT THEN A THEFT DETERENT PROBLEM
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
First check the battery and its connections. Check the voltage at the fuse box (12 volts).If all that is ok then make sure the gear shift lever is in park. Wiggle it around a little then try N. Have someone turn the key to crank and hold it there while you hit the starter. Check for 12v at the large wire that goes to the starter. If there are 12 volts there then you may have a bad starter relay.
PLease, check if the check engine light lit up when you turn the switch, if it doesn't lit up, your EMC (computer) is not getting any electricity. And that could be the reason that you the fuses are OK but it won't start.
You checked the fuel pump relay in the engine compartment fuse / relay box ? The fuse that powers the fuel pump ? ECM B fuse 20amp - engine compartment fuse panel . Is the PCM turning on the fuel pump relay ? Do you know how to test automotive electrical circuits using a DVOM - digital volt ohm meter an a wiring diagram ?
Check battery must fully charged, check starter fuse and relay
Check 12 volt wire from ignition switch to starter relay in the fuse box ,then check 12 volt wire from starter relay to starter motor solenoid if if it's everything is ok then change the starter.
WHAT RELAY? THE ONE IN THE UNDER HOOD FUSE BOX?...HOW DID YOU DETERMINE IT WAS BAD?...RELAYS IN MY VAST EXPERIENCE DO NOT FAIL OFTEN! CHECK FOR 12 VOLTS AT HOT LEAD ON STARTER (THE LARGER WIRE USUALLY RED) GROUND BLACK LEAD TO STARTER BODY OR HOLD ON BOLT IF USING A TEST LIGHT OR MULTI- METER. IF NOT 12 V AT LEAST, YOU BACK UP ...TRACE WIRING, RIGHT BACK TO THE IGNITION SWITCH. BE SURE TO CHECK THAT ALL GROUND WIRES IN SERIES IS CLEAN AND TIGHT AS WELL. NO NOISE....MEANS NO STARTER ENERGIZATION!....FIRST PLACE TO CHECK! ***TRICK FOR YOU: TAP ON SIDE OF STarter body and car may crank over....it isCALLED "the magic hammer trick!
I assume that you mean that the starter will not run. Do you hear the starter solenoid operate (click) when attempting to start? If so, using either a voltmeter or test light, look for 12 volt power at the battery side of the solenoid. If none or it disappears when the starter attempt is made, check the cables from the battery for badly corroded ends. Also, check the grounding cable running from the frame/body over to the engine block for damage. If you hear no click from the solenoid, look for power which should appear at the small terminal of the solenoid when starting. If you get power, replace the solenoid. If no power, then look for a blown fuse, bad relay, bad ignition switch, or any damaged wiring. Make sure the new battery is fully charged. Hope some of this helps!
Hi first check for volts you should have 12.6 volts next check if the wire that go's from the switch to the starter there should be 12. volts if not check relay and fuse good luck
×