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Originally Posted by tmx
2003 Silverado
4.8L
Manual Transmission / Manual 4wd
Posting for a friend: About a week ago, he got into his truck and started it to find the following:
ABS light on solid
Check Engine light on
HVAC controls (manual) no longer work, stuck on full hot w/no fan at all
4wd no longer working
Cruise control not working
Nothing happenned that corresponded to these failures; when he drove to work that morning, everything was fine. When he came out that afternoon and started the truck, this happened.
Right now, the only code that shows is P0704, which is the clutch switch input circuit. However, he has not had any ABS or Transmission codes pulled yet so there may be more that we're not aware of.
We are just now starting to look into this today and are going to check as much as possible before turning it over to the dealer. We are going to start with the obvious such as bad grounds and bad connections at the various modules and connectors and then go from there.
Has anyone here ever run into anything like this before?
Thanks.
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check all fuses with meter then with voltmeter check for power with engine running to find what circuit lost power....could be bad ignition switch...or wire /feed off of switch/ground....
if ground is lost that will make it harder...
dealer will be expensive in most cases so don't give up easy..