P206B code - Chevy and GMC Duramax Diesel Forum
2017-19 GM T-K2 Platform Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 9 (permalink) Old 12-04-2019, 07:35 PM Thread Starter
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P206B code

Has anyone experienced this code yet? 2018 2500HD It also displays a Service Emissions System message, with a mileage countdown to 65mph max speed.

Ideas?

Josh
2018 2500HD High Country
2011 2500HD LTZ
2006 2500HD- 4x4 slammed on 20" LMLs- SOLD
1996 Z28- 8 second ride
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post #2 of 9 (permalink) Old 12-04-2019, 08:03 PM
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Thatís the code for the DEF quality sensor. Probably needs replaced.


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post #3 of 9 (permalink) Old 12-04-2019, 08:06 PM
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So do this trucks do a sanity check on the results of DEF injection or just check quality of the DEF? I would assume they check the exhaust for NOX to insure itís doing itís job. One could otherwise defeat or fake the DEF quality sensor and run distilled water instead


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post #4 of 9 (permalink) Old 12-04-2019, 08:23 PM
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Theyíve got a pre NOX and post NOX sensor, as well as temp sensors through the exhaust.


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post #5 of 9 (permalink) Old 12-04-2019, 08:29 PM
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Someone said you could run on older trucks half def half distilled in order to clean up the def nozzle area. It would of course naturally use more def mixture since only have strength. If the quality sensor could be tricked then that could be useful to improve reliability


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post #6 of 9 (permalink) Old 12-04-2019, 09:51 PM
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Quote:
Originally Posted by jagster936 View Post
Someone said you could run on older trucks half def half distilled in order to clean up the def nozzle area. It would of course naturally use more def mixture since only have strength. If the quality sensor could be tricked then that could be useful to improve reliability


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Please post how that works out for you.

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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post #7 of 9 (permalink) Old 12-05-2019, 05:51 AM
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I cannot do it I have a l5p


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post #8 of 9 (permalink) Old 12-06-2019, 12:38 PM Thread Starter
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Just an update for everyone... I just bought this truck a week ago and have not added any DEF to the system. The CEL came on when I was driving it home from the dealer the night I bought it.

Turns out, someone put diesel fuel in the DEF tank either at the dealership, or the previous owner- nobody seems to know who. They are having to replace the tank and the module because of this.

Josh
2018 2500HD High Country
2011 2500HD LTZ
2006 2500HD- 4x4 slammed on 20" LMLs- SOLD
1996 Z28- 8 second ride
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post #9 of 9 (permalink) Old 12-06-2019, 01:08 PM
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That sucks !


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