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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 11-04-2018, 07:57 AM   #1 (permalink)
Glow Plug
Join Date: Feb 2004
Location: Spicewood, TX
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Turbo issue

In Sept I had a CEL at the end of a 5 day, 1800 mile trip towing 10k trailer. Dealer replaced the vane position sensor. No problems for the next month of towing. Then another CEL, error code P003A, something about failed to calibrate and dealer did a re-learn.

Next day another P003A, and I reset it with my Edge Insight. Also reconfigured the Insight so I could monitor the turbo vane position PID. The Insight was acting funny and I was able to switch to another PID. The Insight got so bad, it would power up, display the gauges for 3 seconds and shut down and I would have to start it again. 3 seconds wasn't enough time to make any changes, read error codes or anything.

I now have a new Insight and it is working fine and I'm back to trying to understand what is going on with the turbo. I drove the truck yesterday, started and stopped several times, no CEL. Truck drove totally normal. I can't imagine that a failing Insight could have created the CEL, but maybe??

But my real question is this. What does the turbo vane position PID really indicate? It reads as a percentage, should it be able to go to 100%? At normal cruising, it would show 70-90%. Come to a downgrade and it would drop to 20-30%. Could someone please educate me on this parameter. It will be another 10 days before I need to tow the trailer home and wondering if I'm going to go into limp mode.


2013 Silverado 3500HD D/A, 2wd CCSB srw, custom RKI bed
2019 Starcraft Telluride 292RLS

Last edited by OkDually; 11-04-2018 at 08:49 AM. Reason: prefix
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Old 11-04-2018, 02:47 PM   #2 (permalink)
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A 100% reading on your CTS2 would indicate the vanes are at their maximum closed position, and 0% the opposite (max open). Itíll change as you accelerate and decelerate, depending on the boost required.

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