Nowhereman

Gotta smog my LT1 Yukon this month.
I thru the handheld on it and found 2 issues.
1. Throttle position sensor
2. Shift solenoid A

I replaced the position sensor and re flashed.
The sensor issue went away with just the solenoid A being left.
I replaced both A and B shift solenoids in the trans and checked again.
The fault still shows shift solenoid A.
Anyone have any other ideas on what could cause this?

FAD2BLK93

Did u clear the codes? And they still came back after cleared them?

LT1FirebirdSLP

iTrader: (2)

Clear codes, then check wiring. Problem could be outside of the sensor if one of the wires for the sensor is grounding out.

Nowhereman

Called GM and they said that for the year that I have; 99. the connection on top of the transmission is the likely culprit.
This means that I have to drop the tranny to check some stupid plug / connector.
Why in the Hell didn't they just design the connector where you can get to it without dropping the trans.

LT1FirebirdSLP

iTrader: (2)

Found a few items to look at...

http://www.bulkpart.com/Merchant2/me...-4L65Esolenoid

http://www.bulkpart.com/Merchant2/me...-4L65Esolenoid

That appears to be both ends of the harness. Just gotta figure out which end is busted.

05HD

Also check the ignition switch and if the truck has a remote start it is wired correctly. Those were two very common problems on those trucks.

Nowhereman

Solenoids are OK, harness is OK, computer is OK...
WTF do you think it is????