Quick tip GM light duty trucks

John Technical Support Specialist New York Posted   Latest  
Tech Tip
2012 Chevrolet Silverado 2500 HD LT 6.6L (8 LML) 6-spd (1000)
Service Emissions System Message

When you have a service emissions system message on, after doing a Def DTC repair you will need to do a reductant system malfunction warning test to clear the message. 

The problem we are having this time of the year is that the test will not run if the ambient air temperature is below 32 deg f.

If the vehicle is brought into a warm shop the ambient temperature will not update on a 2012 or older vehicle unless it sits with the key off for 2.5 hours. 

On a 2013 or newer you can perform a Ambient temperature sensor reset and it will update the temperature and allow you to run the test

William Diagnostician

Great tip! We have had this same issue with ambient temp with AC issues also.

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Bill Technician

You can drive the older ones on the hoist as well to update the ambient temperture if you're in a hurry.

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