03 Silverado electrical & mechanical issues
June 10th, 2019, 10:57 AM
#1
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03 Silverado electrical & mechanical issues
NEED HELP!
2003 Silverado 1500
5.3L V8, 4x4, extended cab, 170k miles
having problems staying running, idling low, weird electrical "glitches"
Thursday:
-out of nowhere power locks stopped working
-truck would start and run for approx 2 seconds then die
-fuel gauge showed E, but low fuel light not on (had half tank of fuel)
- gave her the ole reboot (unhooked battery)
-started and ran fine.
Saturday:
-ran fine all day until out of nowhere stopped running again and exhibited ALL the same symptoms as above.
- rebooted again and it started, but had a very low idle.
-I limped her home and now it's time to diagnose
UPDATES:
-Radio wouldn't shut off So unplugged battery and now radio won't turn on.
-instrument cluster kicks on, but fuel gauge is not correct
REPAIRS/THINGS I'VE CHECKED:
-added a ground to the alternator mount
-No mega fuse
-checked all fuses under hood and in cab
Possible issues??? (Things other people told me)
-bcm
-fuse block
-ignition switch
- bad grounds
-ecm capacitors
Codes:
Only code is P0440 which is Evap so probably unrelated
2003 Silverado 1500
5.3L V8, 4x4, extended cab, 170k miles
having problems staying running, idling low, weird electrical "glitches"
Thursday:
-out of nowhere power locks stopped working
-truck would start and run for approx 2 seconds then die
-fuel gauge showed E, but low fuel light not on (had half tank of fuel)
- gave her the ole reboot (unhooked battery)
-started and ran fine.
Saturday:
-ran fine all day until out of nowhere stopped running again and exhibited ALL the same symptoms as above.
- rebooted again and it started, but had a very low idle.
-I limped her home and now it's time to diagnose
UPDATES:
-Radio wouldn't shut off So unplugged battery and now radio won't turn on.
-instrument cluster kicks on, but fuel gauge is not correct
REPAIRS/THINGS I'VE CHECKED:
-added a ground to the alternator mount
-No mega fuse
-checked all fuses under hood and in cab
Possible issues??? (Things other people told me)
-bcm
-fuse block
-ignition switch
- bad grounds
-ecm capacitors
Codes:
Only code is P0440 which is Evap so probably unrelated
Last edited by Kyle Marquart; June 12th, 2019 at 8:57 AM. Reason: Added info
June 10th, 2019, 11:15 AM
#2
Bad ground or positive connection somewhere maybe.
Could be a mega fuse corrosion issue. I think on the 2003 it's located with the fuse block under the hood. The can sometimes get corrosion under them causing them to no longer make good contact. Remove it and lightly sand the surfaces until clean metal is exposed. Reinstall.
Could be a mega fuse corrosion issue. I think on the 2003 it's located with the fuse block under the hood. The can sometimes get corrosion under them causing them to no longer make good contact. Remove it and lightly sand the surfaces until clean metal is exposed. Reinstall.
June 12th, 2019, 8:48 AM
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Bad ground or positive connection somewhere maybe.
Could be a mega fuse corrosion issue. I think on the 2003 it's located with the fuse block under the hood. The can sometimes get corrosion under them causing them to no longer make good contact. Remove it and lightly sand the surfaces until clean metal is exposed. Reinstall.
Could be a mega fuse corrosion issue. I think on the 2003 it's located with the fuse block under the hood. The can sometimes get corrosion under them causing them to no longer make good contact. Remove it and lightly sand the surfaces until clean metal is exposed. Reinstall.
I dont have a mega fuse. Found the location where it would be, but nothing there. Is that a problem? Or do some just not have one?