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FIX  IT MAN
FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17142
Experience:  Master Automotive Technician
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Resetting the exhaust fluid light on a 2500 hd, we replaced

Customer Question

resetting the exhaust fluid light on a 2500 hd
JA: Thanks. Can you give me any more details about your issue?
Customer: we replaced the reductant heater and float and the light for exhaust service is flashing and truck cant go over 55
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Submitted: 9 months ago.
Category: GMC
Expert:  FIX IT MAN replied 9 months ago.

Hello, my name is***** you for the question. Did you reset the computer after the repair? How much have you driven it since the repair?

Customer: replied 9 months ago.
We updated the Computer! We have commanded the Heaters on with a Tech 2. We have disconnected both Battery Cables and held them together!! Still has the Service Exhaust Fluis Message and won't Go over 55.
Expert:  FIX IT MAN replied 9 months ago.

Can you see what the float and heater are reading from your Tech II? How much has it been driven since?

Customer: replied 9 months ago.
Shows 100% 5 miles
Expert:  FIX IT MAN replied 9 months ago.

Sorry. What year is the truck?

Customer: replied 9 months ago.
2011 2500 HD with a 6.6 Diesal
Expert:  FIX IT MAN replied 9 months ago.

Try driving it about 10-20 more miles if you can to see if it resets. If not then you need to double check that the system shows all three level sensors are active. If that is also fine the reductant sensors may have an issue.

Customer: replied 9 months ago.
We drove it 20 miles! And system has not Reset! We have verified all 3 level sensors are working!!
Expert:  FIX IT MAN replied 9 months ago.

If all three level sensors are working and if the reductant sensors appear to be working then the module may be bad. Are the parts that you used from the dealer?