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Thread: exhaust check light
02-19-2012, 11:46 AM #1
exhaust check light
07-1\2, 2500HD. The amber check engine light for the exhaust filter(DPF) has started to come on after we have towed for a while(in sourthern CA) so when we get to our destination and then driving without the trailer the light goes out, this is the 3rd time in two weeks it has come on. Any sugestions? I just had the fuel filter changed before this started.
Last edited by henrys021500hd; 02-19-2012 at 08:02 PM.07 2500HD Duramax , 4DR and 26 Prowler 5th wheel Travel trailer, 57 Chev wagon with 14' Bonair travel trailer, and 71 Nova. ChevyTalk.org Canadian Regional Coordinator
02-20-2012, 04:45 PM #2
From what he described there is a filter somewhere along the exhaust towards the rear near the tip. That filter had to be changed. If the location isnt right someone will chime in and correct me
This new gadget is part of the new effort to reduce the diesel black smoke output I believe.
Halfway down the page on the following link describes the DPF process.
02-20-2012, 10:14 PM #3
Thanks for the link, I will look under the truck tomorrow and let you know what I find.
02-20-2012, 10:27 PM #4
Are you running a K&N filter?
If you do only/mostly town/city driving (lower speed, stop/go), the DPF (Diesel Particulate Filter, in the exhaust) hasn't had opportunity to regen (run the clean cycle). The truck needs to be driven at/near highway speeds and/or with a significant load for a given period to complete the cycle (or the computer won't be happy, and reduce your power/fuel, among other things). While the K&N filters can cause MAF issues from too much oil (contaminating the MAF sensor), it isn't likely causing your current problem. The dealer should have addressed the DPF regen issue before anything else. To blame the issue on an aftermarket filter, absent of supporting DTC's or symptoms, is irresponsible on their part (doesn't seem too uncommon, lately).
Last edited by Coach24; 02-20-2012 at 10:52 PM.2010 Chevy Silverado Z71 ext cab.4x4
72 Monte Carlo 350-415 hp- sold (June 2011) to pay medical bills
79 Impala 350 4bbl 375 hp- sold (June 2011)to pay medical bills
"If He asks you to go a mile go two"
02-21-2012, 10:47 AM #5
No I am not using any aftermarket air filter, the intake and exhaust are all factory. I have not as yet taken the truck into the dealer for this issue. We are towing an 8000# trailer at highway speeds, low speed/ long idle is not in the picture.
02-21-2012, 08:30 PM #6
Don't know how many miles you have on your truck, I'm not a diesel guy but I'm pretty sure the dpf needs to be cleaned at regular intervals. I heard that Catepillar has the machine and all the attachments for most filters. Don't know how much it is though. Hope this helps.
02-21-2012, 09:30 PM #7
The truck is currently at a Chevy dealer and I will find out tomorrow(wed). 88,000miles.
02-22-2012, 11:57 PM #8
Well we got the truck back today and they replaced the airfilter which was supposidly causing an issue and causing the exhaust checklight. We are leaving here and travelling with the 5th wheel travel trailer for a couple of hours, which has triggered the light to come on before, so lets hope it has been resolved.
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