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Build Threads / Re: LML Duramax build part 6
« on: August 05, 2019, 07:01:12 PM »
Last year I had a couple issues with my 06. First was a dying alternator which causes a slew of problems when the trans doesn't get proper voltage.
The next issue I was having was very similar to what you are experiencing. I chased a bunch of hypothesizes like trim valves, harness issues, leaky harness connector coming out of the trans. The actual problem was a mashed trim valve spring on my transgo shift kit. At some point the spring got hung up on the valve body and the valve proceeded to turn the spring into small pieces.
Symptoms were violent shifts, limp mode locked in gear, incorrect shaft speed codes.
Pull your A trim and B trim solenoids, the valve trims should pop out with the solenoid.
Best of luck.
The next issue I was having was very similar to what you are experiencing. I chased a bunch of hypothesizes like trim valves, harness issues, leaky harness connector coming out of the trans. The actual problem was a mashed trim valve spring on my transgo shift kit. At some point the spring got hung up on the valve body and the valve proceeded to turn the spring into small pieces.
Symptoms were violent shifts, limp mode locked in gear, incorrect shaft speed codes.
Pull your A trim and B trim solenoids, the valve trims should pop out with the solenoid.
Best of luck.