My wifes 99 K1500 Suburban 5.7 was showing the check engine lite.
I pulled a P0405 and a 1404 code. Truck has 101,000+ on it.
Replacing the EGR Valve solved the 1404, but we still have the
P0405 "Low Input Circuit" code coming up.
Any ideas as to what is causing the "Low Input Circuit" P0405
code, and or what needs to be replaced or cleaned up.
Any help would be appreciated as time is important. It's due for
Emissions test by the 23rd and I'm going in the Hospital on the
20th for surgery and won't be out till the date is past. In our
state, She can't even drive the vehicle after the emissions date
and no test.
I searched thru all 13,000 post I have on file and can't find any
mention of the P0405 code.
Thanks in advance,