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01-21-2015, 11:52 PM
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#1 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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tranny problems?
P0740 tcc circ mal
P0753 shift solenoid A circuit electrical P0758 shift solenoid B circuit electrical P0785 shift timing malfunction P1860 manufacturer control transmission All of these codes come on immediately after turning on key. I'm thinking I have a bad ground. This is my 70 with a LS swap almost done just working on the kinks... I don't think that all of this stuff is wrong with my trans.... Any help would be greatly appreciated!!
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70 C10 working on a LSx swap  4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-21-2015, 11:53 PM
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#2 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
Obviously my tune isn't completed yet. Would this stuff be from my tune??
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-21-2015, 11:59 PM
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#3 |
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Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: tranny problems?
What year engine is it? I had a P0785 and it was a 2-3 shift solenoid code, not what you listed it as. Anyway, have you checked for power to the trans? I would suspect all those codes are caused by the same problem.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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01-22-2015, 12:07 AM
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#4 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
no I haven't done any troubleshooting yet I was just picking some brains before I got into it. I assume ground or hot is missing...
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-22-2015, 12:08 AM
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#5 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
Its a 99 4.8 4l60e and ecu all a matching set from the same truck
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-22-2015, 01:46 AM
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#6 |
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Registered User
Join Date: Jul 2013
Location: VAFB, CA
Posts: 227
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Re: tranny problems?
Sounds like a power/ground issue. I would also make sure the plug is fully seated and verify pinouts.
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01-22-2015, 01:49 AM
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#7 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: tranny problems?
Don't take this the wrong way...but is the main wiring plug actually plugged into the trans? Its easy for trans fluid to get on the connections and partially cause issues at the connection point. Check the plug, hit it with some electric safe contact cleaner and reassemble it. Anytime I see 5+ codes at the same time, there is usually an obvious thing that just got overlooked or knocked off by accident etc)
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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01-22-2015, 12:05 PM
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#8 | |
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Registered User
Join Date: Oct 2014
Location: Metro Detroit, MI
Posts: 202
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Re: tranny problems?
Quote:
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01-22-2015, 04:41 PM
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#9 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
does anyone have a pin out for the transmission plugs
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-22-2015, 04:46 PM
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#10 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
thanks guys I'm right there with ya I'm thinking it's probably a ground.
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-22-2015, 05:04 PM
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#11 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: tranny problems?
4l60e
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING |
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01-22-2015, 06:11 PM
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#12 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
thanks guys I'm right there with ya I'm thinking it's probably a ground.
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-22-2015, 06:18 PM
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#13 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
All solenoids share common 12V line on pin E (except Pressure Control solenoid, which has its own +12 Volt supply on pin C)
According to http://www.msgpio.com/manuals/mshift/wiring.html I checked pin E with my key on showed 0V so I believe that is my problem
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-22-2015, 07:04 PM
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#14 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
Thanks Brew didn't refresh my page before posting that stuff so I think I found the problem I'm in for dinner then headed out to track down how I missed that lol
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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01-28-2015, 11:04 PM
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#15 |
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Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,280
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Re: tranny problems?
I have the almost exact same thing in a truck that is NOT a swap. It is a 04 1500 Silverado.I was scraped down the side when I bought it and I built it and then I have PO740, PO753, PO758,PO785 and the difference is p2761. I had a guy look into this then he told me your getting fire to the trans you need a harness in the trans. I ordered in put it in. Same thing. I took it to the big dealer in Little Rock they told me the sprag was bad and for $1900 they could pull it out and fix the broken hard part and get me going. I told them twice the codes were TCC open meaning broken wire[or so I thought]. He assured me it was a bad trans. So I brought it back to the shop and had it changed out it is till there. The trans that was in it was a fresh rebuild, I mean really fresh. It makes me think the problem was there and the people couldn't get it fixed then had a new one put in and still did it so then he smashed it down the side. I have another motor wiring from a truck that I'm junking out[having extra parts rocks]any body with great ideas? sorry to post here I don't feel this is thread jacking since all the codes are the same maybe someone could stumble on the answer for both of us? Although I feel mine might be found in the couple of feet between the back of the intake and the lower side of the trans plug. Jim
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01-28-2015, 11:05 PM
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#16 |
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Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,280
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Re: tranny problems?
Did I include that I hate wiring and had rather be grinding body filler for the whole day than doing wiring for a half? Jim
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04-26-2016, 11:32 PM
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#17 |
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Registered User
Join Date: Apr 2016
Location: Grand Forks ND
Posts: 1
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Re: tranny problems?
what did you guys find out was causing the problem/codes. I am having the same problems after a 5.3 swap
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05-11-2016, 04:46 PM
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#18 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: tranny problems?
After tuner everything is fine
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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