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· Registered
2015.5 Silverado LTZ 3500 SRW Stock truck
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1,349 Posts
What are you trying to accomplish? You have codes or messages?
Turn the pump on with the scan tool and pressure should hit 70.
DEF is not used for regeneration.
 

· Registered
2015.5 Silverado LTZ 3500 SRW Stock truck
Joined
·
1,349 Posts
Clear codes and run a system tamper service bay test. If the codes don't clear then what are they?
 
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