so heres the story i have a 02 bonneville 3.8 l engine light is on comes up with a code for low voltage at maf i have pulled the wire off and checked have 12 volts ground and your ref 5.0 volts but im reading 0 with the scanner when i look at the readings and does have a code for seconday air injection pump too any help would be great

What are the codes?

The codes are p01032 p0412 p0418 p0443 thanks bill

Some light reading for you:

https://www.gmforum.com/obd-ii-trouble-shooting-153/p0412-285585/

https://www.gmforum.com/obd-ii-trouble-shooting-153/p0418-285581/

https://www.gmforum.com/obd-ii-trouble-shooting-153/p0443-285580/

https://www.gmforum.com/obd-ii-trouble-shooting-153/p0132-284062/

I will take a look at these tomorrow if I get a chance to see if they tell a story well all put together.

these are all control circuit errors, check all the fuses, i looked at the man. they dont share a common fuse. sometimes a low or failing battery will cause issues like this as well as loose or corroded pos or ground connections

thanks i will test the battery and then do some of the other test

To answer your questions I've had the 🚗 about 50k bought it at 100k haven't ever done anything but routine maintenance to it since I bought it. Tranny fliud was upgraded to dexron6 per the service bulletin thru GM no issues after the change. Sorry plugs looked fine but I did replace the number 6 because of the code no change still intermittent issue with the same code.New air filter,new MAF sensor. Checking for vacuum leaks rotted houses ECT. The car does run better since this started without the supercharger running I removed the belt and it runs and shifts better without it.

This is 12 years old. They may be dead by now.

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