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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a short in the allison transmission harness

Customer Question

i have a short in the allison transmission harness (external) no i noticed my oil plug also leaks... when my oil level is on the lower side... all is good but once i fill it to where it needs to be for some reason the TCM throws codes and i get very erratic behavior from the truck
JA: Have you ever replaced the gaskets? Maybe the hoses?
Customer: i have replaced the oil plug and seal
JA: What is the model/year of your Chevy?
Customer: 2003 sivlerado 2500hd silverado has the 8.1 with allison trans
JA: Are you fixing your Silverado yourself? What have you tried so far?
Customer: id like to try and find what it is about the oil leak... im curious if its dripping onto a sensor etc... i have tried inspecting what i can... i do notice i have a clicking noise inside the trans.... if i wiggle the main wireharness thats ruuning along the top end of the trans i can get the clicking to stop and the error codes and loss of comm with tcm goes away then if the wire moves a little it comes back
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 8 months ago.
Category: Chevy
Expert:  Pete replied 8 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Is any oil notice to run out of the wiring harness with the connector disconected at all from the transmission?

Let me know so we can continue,thanks Pete