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Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15561
Experience:  15 years GM master tech
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I'm getting a P2101 and P1517 on my 06 chevy trailblazer.

Customer Question

I'm getting a P2101 and P1517 on my 06 chevy trailblazer. The engine starts in the low power mode.
JA: Will the headlights turn on? Is the battery fully charged?
Customer: Battery fully charged headlights come on
JA: Are you fixing your Trailblazer yourself? What have you tried so far?
Customer: What I could find was errors related to the TPS and the correlation between the TPS and the pedal sensor not matching
JA: Anything else you want the mechanic to know before I connect you?
Customer: I have tried a second, known good throttle body with TPS in it.
Submitted: 7 days ago.
Category: Chevy
Expert:  Gary replied 7 days ago.

Welcome! My name is ***** ***** I will do my best to assist you with this problem.Ask me about added features such as phone contact anytime if you wish !

Expert:  Gary replied 7 days ago.

if you clear the codes which one sets back first ?

do you have a good multi meter on hand ?

Customer: replied 7 days ago.
I have a multimeter and yes cleared codes. The O2 2nd bank sensor trips first
The engine stumbles at idle but smooth's out at ~2500rpm
If I hold the throttle plate at about 14% (slightly backwards from accelerate the engine smooth's out then also
I have cleaned the throttle body and vacuum port. Throttle plate operates smoothly
I believe the O2 and then the MAF codes set first due to the low power mode.
I have tested the wiring harness at the throttle body to ensure there were no broken wires.
Customer: replied 7 days ago.
Another curious code that has tripped is the key circuit 2 code. I'll grab it work you
Expert:  Gary replied 7 days ago.

what O2 sensor amd Maf codes ?

you said P2101 ans P1517 both are throttle body codes that are set

Customer: replied 7 days ago.
I just cleared the codes again
I am getting these 2
P1682 and P2101
The truck will not idle at this time
Expert:  Gary replied 7 days ago.

follow this next

The Throttle Actuator Control (TAC) System uses an ignition voltage supply separate from the powertrain control module (PCM) supply. If the PCM detects a voltage difference between the 2 circuits, this diagnostic trouble code (DTC) will set.

This diagnostic procedure supports the following DTC:
DTC P1682 Ignition 1 Switch Circuit 2


  • The ignition is ON.
  • DTC P1682 runs continuously when the above conditions are met.


  • The ignition 1 voltage is less than 10 volts .
  • The above condition is present for more than 1.6 seconds .


  • The control module stores the DTC information into memory when the diagnostic runs and fails.
  • The malfunction indicator lamp (MIL) will not illuminate.
  • The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
  • The driver information center, if equipped, may display a message.

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Customer: replied 7 days ago.
you sent me gifs of a troubleshooting guide that requires the use of a Tech II scan tool of which you know I don't have and then have asked me to accept the resolution. There are references to specific test points but no diagram showing which is what (example step 6)
Customer: replied 7 days ago.
I need to know if these two codes might be related and if so steps specifically to diagnosis.

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