Duramax Diesels Forum Truck of the Week
Old 09-22-2018, 07:40 AM
Philv's Avatar
Philv Philv is offline
Join Date: Jan 2018
Location: Surprise, AZ
Posts: 113
Default Just got a new code

My truck has never thrown this code till now. P0234 I'm not pulling a trailer, wasn't hard on the throttle, and my boost gauge read 18-20psi. I just got to the the top of a 6% climb and egts were holding at 1k. What in the would could've happened for it to throw that? And yes my truck isn't tuned yet. Saving for efi live.
2001 GMC Sierra 2500HD SLE EC/LB 4x4
LDS 45% SAC injectors
Airdog 4G 165 lift pump
Cold air intake
4" straight exhaust 6" tip
PPE boost valve
Glowshift gauges
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Old 09-22-2018, 08:15 AM
PureHybrid's Avatar
PureHybrid PureHybrid is offline
Isuzu Shakes IT
Join Date: Feb 2012
Location: Central OH
Posts: 2,347


Over boost?

Try and take the PPE valve out. My buddies truck kept throwing an over boost code with 30% injectors on his stock tune, no boost valve even. Kind of forced him to tune it.
04 GMC ECSB LLY - Mix breed trans/SC1056 - Profab - PPE - Kennedy twin pumps/pickup - Danville tuning: 531/944
I can't complain, but sometimes I still do
8.17@84mph 1/8mi
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Old 09-22-2018, 08:38 AM
zakkb787's Avatar
zakkb787 zakkb787 is offline
<thatís not me...
Join Date: Sep 2014
Location: Granite Falls NC
Posts: 1,667


With pure hybrid here. The truck probably isnít running 100% as it is from the different style injectors flowing larger amounts. Coupled with more boost than it generally thinks it should see.
2006 LLY CC/SB LT3 black, charcoal interior, tuned, leveled on 33s, my little piece of heaven

Other toys:
1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inch lift and 35s.
2011 Yamaha YFZ450X
2018 GasGas XC300
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