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What could be causing these electrical issues.

Tiny
ROCKY810
  • MEMBER
  • 2002 CHEVROLET AVALANCHE
  • 120,000 MILES
I had an issue with my instrument cluster, then a battery drain overnight, then a p0753 code along trans stuck in 2-3 gear with a few others. I just replaced the ignition switch and the battery drain stopped and the trans was working fine. The cluster still didn't work. A few days later the trans went back into 2-3 mode with the same code, no battery drain. The crazy thing is I plugged my code reader in and I noticed all the gauges work when it is plugged in and stop when unplugged. Trans still in limp mode. Does this sound like a ground issue or something, before I replace the shift solenoid? Need help
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Saturday, December 3rd, 2011 AT 6:43 PM

27 Replies

Tiny
SATURNTECH9
  • MECHANIC
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Yeah it sounds like a ground issue atleast for the instrument cluster issue and possibly your other issues. The scan tool is partialy completling the lost ground. Do you have a multimeter to do some testing?
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Saturday, December 3rd, 2011 AT 7:01 PM
Tiny
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Yes I do.
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Saturday, December 3rd, 2011 AT 9:27 PM
Tiny
SATURNTECH9
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Alright give me your email address and I will email you a wire diagram for the instrument cluster that shows the grounds lets start there.
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+1
Sunday, December 4th, 2011 AT 12:45 AM
Tiny
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Dua61@comcast. Net
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Sunday, December 4th, 2011 AT 2:14 AM
Tiny
SATURNTECH9
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Let me know what you find I emailed you the wire diagram. You should 2 ohms or less to ground on those ground wires. Check them to ground on the wire not where they bolt up.
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Sunday, December 4th, 2011 AT 2:24 AM
Tiny
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Ok, I will check it in the morning and let you know. Thanks.
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Sunday, December 4th, 2011 AT 2:41 AM
Tiny
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Your welcome keep me posted.
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Sunday, December 4th, 2011 AT 2:44 AM
Tiny
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I am looking at the diagram on screen and printed it but can't make out the print. Its kind of fuzzy.
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Sunday, December 4th, 2011 AT 12:38 PM
Tiny
SATURNTECH9
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Did you print it the same size it came in the email?Or did you blow it up bigger before printing it?If you blew it up bigger then printed it try printing it the size I sent it to you.
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Sunday, December 4th, 2011 AT 3:32 PM
Tiny
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Update, I found two black/white wires coming out of the firewall behind the intake manifold, (left of center looking at engine) They are just hanging, I think they were grounded to the block. I connected them to a ground and my gauges now work. Now the p0753 code. Its strange that the ignition switch fixed this and then it starts up again. I have power at the fuse for this circuit. Haven't checked the circuit farther yet. Do you think this is a coincidence or could the solenoid be bad. I am now also getting a knock sensor code. Thanks in advance
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Sunday, December 4th, 2011 AT 3:33 PM
Tiny
SATURNTECH9
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Replacing the ignition switch could have very well been a considece that your other problems went away for a little bit. Good job finding that unhooked ground though. So what are the exact code numbers you have now?Also how is the transmission shifting?
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Sunday, December 4th, 2011 AT 3:41 PM
Tiny
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I replaced the switch for the p0753 code and the gauges and a bad battery drain issue. I read all of these can be related to the switch. After the switch replacement the truck drove fine, no codes or pending codes, and after sitting overnight the battery was fine the next morning.( I think the switch was letting my auto lights come on at night, a neighbor told me my lights were blinking one night). The gauges still didn't work but the trans was shifting fine and battery was fine. Two days later the p0753 code comes back and now a p0332 knock sensor. The trans seems to be in 2nd and third gear, no first or fourth or overdrive. Works in 123 manually.
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Sunday, December 4th, 2011 AT 3:50 PM
Tiny
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So after hooking up that unhooked ground and clearing the codes those are the codes you have and how the transmission shifts?
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Sunday, December 4th, 2011 AT 3:57 PM
Tiny
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Yes
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Sunday, December 4th, 2011 AT 4:20 PM
Tiny
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What size engine do you have?
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Sunday, December 4th, 2011 AT 10:08 PM
Tiny
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There is the trouble tree for code P0332.
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Sunday, December 4th, 2011 AT 10:21 PM
Tiny
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5.3
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Sunday, December 4th, 2011 AT 10:27 PM
Tiny
SATURNTECH9
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Do you happened to know if you the 4L60-E or the 4L80-E?That way I can get you the correct info for the code P0753.
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Sunday, December 4th, 2011 AT 10:42 PM
Tiny
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I'm not sure. I think its the 4l60e. I will have to check
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Sunday, December 4th, 2011 AT 11:35 PM
Tiny
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Alright keep me posted.
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Sunday, December 4th, 2011 AT 11:41 PM

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