First i got a stabilitrak service light, then i got the traction control service light. Both of which stay on on the time, the check engine light is on. Had the code pulled and said it was the tps sensor. Got a new TB and installed. Reset battery and drove for few miles to reset the revs for each gear. After about a day same problem reoccured. Now that it has gotten colder i am now getting a reduced engine power to go with the other three faults. I am confused about what to do next. Withe then new tb that should eliminate that as a suspect. Any ideas i would rather get the parts to fix myself and take them to someone rather than pay for diagnosis and parts and labor. PLEASE HELP!!

 

get the codes read and post it here. The abs and traction are disabled when the ses light fault occurs.


just because a tps code sets doesn't mean its a tps part failure. your going to have to do some diagnostics.

 

The following codes appeared: P0121, P0171, and P1779

scanner says low voltage from the tps and also egr valve faults....

 

the reduced power mode is setting due the p0121 so diagnose that code first. The p1779 is an informational code only.
p0121 sets when the ECM detects that the airflow rate is more than the calculated airflow for more than 0.2 second.

If this was done at a shop; they need to recheck their work.


A vacuum leak would cause this and would also cause the lean fuel trim po171 dtc that is setting.


do you have a scan tool that can view live fuel trim data?


post the dtc related to low tps and egr voltage