Question about 2003 GMC Sierra
Your truck has an electronically controlled throttle system. There are (2) TPS sensors located on the accelerator pedal.
Both of the sensors must agree, by way of a voltage signal, to the current position of the throttle. If (1) of the sensors sends a different voltage signal back to the PCM than the other, the PCM will set this fault.
The reason for the (2) sensors is redundancy. In the event a sensor fails, the other will allow the engine to run and not leave you stranded.
A scan tool will be able to determine which sensor is out of sync and then can be replaced.
I hope this satisfies your question. Let me know.
Posted on May 12, 2009
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Posted on Jan 02, 2017
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