Error Codes P2176 Throttle Actuator Control System - Idle Position Not Learned
Http://engine-codes.com/p2176_chevrolet.html have a look to this link
hope it helps
P2176 Chevrolet Minimum Throttle Position Not Learned
The Engine Control Module ECM is the...
SOURCE: I got code p2176 I changed out the tps still got
P2176=Throttle Actuator Control System - Idle Position Not Learned
Did you use all you old sensors,or is some of them from the new engine,I would swap out the IAC sensor or check for wires not hooked up.
If it can't relearn to idle the Idle air control might be different then your old one,but its not registering with the computer
SOURCE: P2176 Throttle Actuator Control System ? Idle Position Not Learne
if it runs ok leave well alone ,the actuator control is the thingy on the throttle linkage on the butterfly spindle on the inlet manifold.This wouldnt cause a flat battery ,,,,,more like your mrs left the lights on
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