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Old 11-15-2016, 12:11 PM
Findm-Keepm's Avatar
Findm-Keepm Findm-Keepm is offline
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Join Date: Jun 2007
Posts: 2,832
We had an early 2004 Envoy - lots of electrical problems. Two unique ones, both fixed with a swap out of the ignition switch...odd scheme, with high resistance across the contacts of the switch would cause a CEL and popping a code for solenoids in the tranny. The tranny would go into limp mode (no higher than 2nd gear). The Trailblazer forum gave up the solution that worked. NAPA is the only aftermarket store I found that sells the switch.

Engine had 206K on it when we traded it in, and never used a drop of oil, and had plenty of power...All other functions worked fine too.
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Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"

When fuses go to work, they quit!
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