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Po128 is that the engine has not reach operating temperature in a calculated time frame. Most likely cause is bad thermostat or low on coolant. P2176 is the throttle position sensor has lost its learned value. Throttle bodies with electric motor controls need to know closed position to maintain proper idle speed test sensor for proper voltage signals to power control module . This code is only tested once per ignition cycle.
make sure it is a p2175, I do not see a DTC for p2175 on a 2006 chevy impala but i do for p2176 which isDTC P2176: Minimum Throttle Position Not Learned
NO , gas cap not the issue here . the P2176 refers to throttle actuator control system - idle position not learned .... the test for this is a mile long , i would try clearing the code , and see if it returns , or it will reset itself if it see's 3 drive cycles without a failure . cheers.
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