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Gary
Gary, ASE Certified Technician
Category: Chevy
Satisfied Customers: 742
Experience:  Senior Technician
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I have a 2004 Chevy Tahoe with 5.4L V8. It's showing a

Customer Question

I have a 2004 Chevy Tahoe with 5.4L V8. It's showing a "reduced power" on the instrument panel along with a check engine light. After scanning, the following codes were set: P0120A Throttle position sensor 1 circuit. P0220A Throttle position sensor 2 circuit.
P1516A Throttle actuator module throttle actuator position performance. The throttle body has been replaced along with the APP Accelerator pedal position sensor. It worked for about a week and got the "reduced power" and the same three codes again. I checked
the ground wire on the left bank and its secured. Do you have any other suggestions?
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.
Generally it is the throttle body, but I have had one car where one wire would intermittently ground to the cylinder head (V6 Commodore).
You may have a wiring issue which will be harder to find.
Is the the throttle body new?
Have you got a circuit diagram?
Gary
Customer: replied 1 year ago.
Yes, the throttle body is new and no I don't have a circuit diagram. Know where I can get one?
Expert:  Gary replied 1 year ago.
I've googled, but a workshop manual would be better to get hold of.
Maybe this may be of some help:
http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/p0120-tp-sensor-tests-1
The DTC is similar so the test should be appropriate.
If the wire colours match, I'd carry out the procedure.

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