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03Z71
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Jan 25, 2012, 11:03 AM
Post #1 of 14
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Reduced power message
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Alright Guys!
I have a 2003 Chevy Silverado 1500, 4.8L, 4WD! I recently replaced a transmission! After reconnecting all clips and connectors, hooked up battery, got reduced engine power message! Left batt on charger overnight, come out in morning, started right up, no issues! Went through all processes such as radio, a/c, and all that! Noticed that one headlight was dimmer than the other! Tried to turn on high beams, and truck shut off! Now the actuall high setting doesn't work at all, and when I pull back to quick activate the highs, the truck dies, and if I turn my headlights to the on position, the reduced engine power message comes on! Reset it with reader, and took it for a drive! No speedometer reading, and the transmission will not shift gears at all! I can go through them manually, but not in D! I have checked the grounds to the back of each head, and have checked all connectors to see if there were any loose! Nothing! Can someone help me here! When I run the scanner, it comes back with the 1518 code! Leads to the TAC every time??
(This post was edited by 03Z71 on Jan 25, 2012, 11:15 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2012, 12:37 PM
Post #2 of 14
(2582 views)
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Re: Reduced power message
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Go back over your work and double check everything, especially any ground wires that you could have left off.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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03Z71
User
Jan 25, 2012, 1:19 PM
Post #3 of 14
(2578 views)
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Re: Reduced power message
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Okay! Found another ground I had left off! It was hiding behind the monifold! That takes care of the TAC/Headlight issue! Now my problem is the speedo doesnt work, the transmission won't shift up, and on recent test drive, Transmission acted as if it wasn't keeping up with engine! Almost like it would play catch up with the RPM'S! Any thoughts on that issue??
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2012, 1:29 PM
Post #4 of 14
(2573 views)
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Re: Reduced power message
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See if the speed sensor is plugged in.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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03Z71
User
Jan 25, 2012, 2:05 PM
Post #5 of 14
(2565 views)
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Re: Reduced power message
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I am trying to locate it! I dont see what is shown in any pictures, and there are no open ports where there should be a sensor! I am still researching to see where it is in my truck??
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2012, 2:06 PM
Post #6 of 14
(2562 views)
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Re: Reduced power message
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Should be in the tailshaft on the driver's side.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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03Z71
User
Jan 25, 2012, 2:08 PM
Post #7 of 14
(2558 views)
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Re: Reduced power message
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Does that include the 4x4 version! I have searched both the old transmission, and the replacement! I am not finding this sensor on either one!
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03Z71
User
Jan 25, 2012, 3:07 PM
Post #8 of 14
(2553 views)
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Re: Reduced power message
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Found it! It is on the back side of the transfer case! It is plugged in! I am trying to figure out if there is a ground for it that isn't connected somewhere! I have three ground leads so far that I have to connect! I have tested them all and they all fixed every problem but that one! Do you know if there is a separate ground wire for that specific Sensor?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2012, 3:55 PM
Post #9 of 14
(2547 views)
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Re: Reduced power message
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If that is a different transfer case, it may have a bad speed sensor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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03Z71
User
Jan 25, 2012, 4:36 PM
Post #10 of 14
(2539 views)
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Re: Reduced power message
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Nope! Same transfer case that came out of it! I may change it out and see what happens! Tomorrow I am going to do solid connections on all of the grounds and see if that changes anything!
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03Z71
User
Jan 26, 2012, 1:01 PM
Post #11 of 14
(2506 views)
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Re: Reduced power message
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Okay! I am getting power to the harness where it meets the transfer case, and upon checking the connectors for the speed sensor, I am not getting and avtivity from them as far as power goes! I am pretty sure there is a power port on the connectors? I found the ground connections for each of these at the frame, and they are connected solid! I am at a loss! I have checked, rechecked, and double checked to see if I missed a ground somewhere, and just can't find one! Any other suggestions?
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03Z71
User
Jan 27, 2012, 11:53 AM
Post #12 of 14
(2490 views)
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Re: Reduced power message
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Okay! Replaced the Speed sensor, and still nothing??? At a loss right now! And now my ABS light is on, but the fuse is good! When I pull the fuse, the light stays on! Put the fuse back in, the light goes out for a second, and then back on again! Just checked it out! Does this help any??
(This post was edited by 03Z71 on Jan 27, 2012, 12:14 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 27, 2012, 5:41 PM
Post #13 of 14
(2484 views)
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Re: Reduced power message
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Unplug the transmission electrical connector. With the ignition on check for battery voltage on the pink wire terminal in the connector.
Just curious, but why did you replace the transmission?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 27, 2012, 5:45 PM)
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03Z71
User
Jan 27, 2012, 6:33 PM
Post #14 of 14
(2473 views)
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Re: Reduced power message
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I replaced Transmission because I lost third gear in the origional! And with 170,000 on it, I figured what the heck! I will get a voltage meter and check, and let you know tomorrow!
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