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DREADED: "Reduced Engine Power"


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Old 09-10-2014, 09:27 PM   #1
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2003 Silverado 1500 HD
DTC P1516

I have:

1 Googled several days and read many posts.
2 cleaned the Throttle Body
3 checked connections for soundness and broken wires
4 checked power, ground, resistance, and signal of TB sensors 1 & 2 and motor
5 checked power, ground, resistance, and signal of APP unit
(I used digital and analog multimeters to check values and responses)

One thread I was following about a 2003 Silverado 2500 stated more than once that the "TAC module" was part of the Throttle Body and there was not a separate "TAC module". Perhaps that was not a HD series.
This truck has a separate "TAC module".

I have not yet found any information concerning "Testing Diagnosing or Troubleshooting" this "TAC module".

Can anyone help me?

Thanks Don,

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Old 09-18-2014, 08:16 PM   #2
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Is it throwing any CEL codes?

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Old 09-20-2014, 02:28 PM   #3
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Quote:
Originally Posted by Onimun View Post
Is it throwing any CEL codes?
Yes, DTC P1516

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