GMC Troubleshooting Questions? Ask a Mechanic for Answers
There have been several type over the last year. The last 5 have been for throttle body. I had it replaced (second time, first was last October) yesterday, drove it five miles and "check engine" "TC" and reduce power and came on. What was different yesterday, I was pulling into a stop sign when it happened and it stalled the engine. Usually it just reduces power to the engine. I let the truck sit at the intersection for a minute and restarted the engine and regained full power to the engine an was able to get home.
the code it keeps throwing is a p2135. put a new throttle body on it (did not work) Mechanic says I'm losing voltage thru one of the sensors. It throws the code every time I drive right about the time the vehicle reaches normal operation temperature.
Mechanic found a lose ground. cleaned and tightened. he was not happy that there was still differences in the sensor(s) data. But while test driving despite the data not matching up the engine has not gone into reduced power mode. Put about 100 miles on it so far so good.