GMC Troubleshooting Questions? Ask a Mechanic for Answers
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?
Can you see what the float and heater are reading from your Tech II? How much has it been driven since?
Sorry. What year is the truck?
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.
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?