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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. 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 10-18-2015, 11:47 PM   #1 (permalink)
High Compression
Join Date: Jan 2006
Posts: 29
iTrader Score: 0 reviews

Bad Turbo?

When towing my trailer on the freeway at roughly 60 mph, my turbo boost gauge will go up to about 14k psi and then cut out/drop to about 8k psi. It keeps doing this (up/down/up/down) all the way down the road and more so when I go up any incline. I can hear the turbo whine go away so I know it is not just a bad gauge. Also, I threw a p045 recently at the end of a long towing trip. Is my turbo on its last leg or something else. Thanks.

2005 HD LLY
Banks Bundle with six gun tuner
Banks Intake
#2&7 harness replaced
Blocker plate and finger stick
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Old 10-19-2015, 10:59 AM   #2 (permalink)
Diesel Nut
Join Date: Jul 2004
Location: Norton Ohio
Posts: 962
iTrader Score: 0 reviews

Buckeye Oil Burners Member

it appears you have a missing number in the DTC code, running a search as is, gets some results to check

could be one of the following, do the free one first

1. you could be getting a leak. check all the rubber boot connections, make sure they bands are still tight and there are no little pinhole leaks

2. vane position sensor could be going, if it goes/is failing,it can cause the situation of the turbo spinning up, losing boost, etc

3. there could be a leak in one of the other components, but most likely not and most likely not a failing turbo (not saying it isn't just most likely not)

if you do a google search using

gm duramax p045

as the search term, you will get a bunch of hits and some reading to do,

here is a list of DTC codes

Pacific Performance Engineering - Diesel Specialists

just for the record DRCook = David R Cook - not Dr Cook, but thanks for the compliment

2004.5 Sport Red Metallic Crewcab Shortbox 4x4 LLY ARE Truckcap/Bedrug liner Bilsteins Hellwigs front and back, LBZ mouthpiece + entire 06 intake, nbr 2 and 7 wiring harness. Racor auxiliary fuel filter, Engineer837 auxilliary radiator, Earl's tranny cooler, fender vents, Banks intercooler & Speedbrake, Merchant Automotive transfer case pump rub fix
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