Duramax Diesels Forum Truck of the Week
Old 09-25-2018, 08:04 PM
duramaxnate's Avatar
duramaxnate duramaxnate is offline
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Join Date: Feb 2014
Location: Norco, CA
Posts: 510

Default P0670 affect EGR Monitor?

I have a 2005 LLY that a customer is trying to get smogged out here in lovely CA and the EGR monitor will not come up ready.

Truck is BONE stock. Reflashed the ECM from GM TDS to verify truck had a stock cal in it, checked everything egr related and all is good.

BUT it is throwing a P0670. That wouldn't cause the EGR Monitor to not come up will it?

The next thing I am checking is IGN voltage. I remember having one with this code and it being the ign switch due to low ign voltage, but never checked the EGR monitor status on that truck.



-"Casper" 2005 GMC LBZ ECSB
Best Time: 10.59 @ 128 (Kat Driving)

-"Betty" 2006 GMC LBZ CCSB
Best Time: 12.70 @ 104
Not going any faster.

Thanks to all that helped me

- The McRats
- Mike L @ Inglewood Transmission
- And many others
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Old 09-25-2018, 11:59 PM
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ChrisPerry ChrisPerry is offline
Join Date: Apr 2016
Location: Ventura, CA
Posts: 193

Not sure about a glow plug code causing the egr readiness issue, but I've had issues trying to get it to read ready after a stock reflash for smog. Drove for a week and still not showing ready. Found a way to get mine ready in 2 cold starts.

Start up cold let warm for 15 min.
Drive to freeway,accelerate hard to 65, hold speed for 60 seconds, let off throttle and coast down to stop.
Accelerate hard to 65 again, hold 60 seconds, and coast to stop again.
Do this a total of 5x's
Park overnight, do it again next day, moniters should be ready.

This has worked every time.
02 GMC 2500HD, EC/LB, LB7, 2wd, 6" lift, 35" tires. ds LML manifold, PPE level 10, boost valve, race plug, Airdog 165 lift pump, CAT filter mod, mechanical egt and boost gauges, SB intake, high flow turbo horn, ported turbo exhaust housing, kbd drop in wheel, Banks Bighead wastegate, egr blocked, intake heater delete, PPE downpipe, 5 " exhaust w/ cat delete, Mike L built trans w/ Goerend R converter. Levi's heat blankets

7-6-17...New headgaskets, studs, Fed heads, and LDS replacement injectors @ 202,239 Miles
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