Code P2135, engine power reduce mode?

Tiny
KENFOLK90
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 305,596 MILES
Every time I press the gas my truck goes into engine power reduce mode. The only code I'm getting is p2135.
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Friday, August 5th, 2022 AT 4:56 AM

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Tiny
AL514
  • EXPERT
Hello, I found the correct one, this code is for the Throttle position sensors on the Throttle Body, the 2 sensors signal are not in correlation with each other. I will pull up the wiring diagrams for you to check the wiring harness at the throttle body. If you unplug the connector from the throttle body and turn the key to just the on position and check the wiring with a basic multimeter, you can see the light blue/black wire should have 5 volts and the grey wire should have 5 volts. You can actually use the multimeter across the grey wire and Black wire to measure the 5 volts because the Black wire is the Ground for the sensor. The same for the Light Blue/Black wire and the Black/White wire, those two should read 5 volts too. These are the signals going back to the engine computer to relay the Throttle Plate position. The brown wire and yellow wires are the motor that moves the throttle plates. But most likely this is going to be a failed throttle body assembly. But it's good to check that the feed voltages are there.

It is also possible for there to be poor connections inside the engine computer, so check that the feed (reference) voltages are there. (5th diagram) Check the connector for any burn or corroded connections. Or discolored connector meaning it got hot due to high resistance, Diagrams 6 and 7 are removal and installation of a new throttle body. There may be a relearn procedure for the throttle body too which requires a scan tool with that special function.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
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Friday, August 5th, 2022 AT 10:06 AM

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