P0642 -what does this mean

Question

engine light is on car runs good but I have code po642 low voltage circuit low where and what is this

Answer 1

HI there

This code means one of the 5 volt reference signals is not working from the computer. Here is a list of possible causes.

P0642 CHEVROLET - Sensor Reference Voltage 'A' Circuit Low

Read more: https://www.autocodes.com/p0642_chevrolet.html